#42 Screw machine length twist drill, through 1 in.

D 0.0935 in · 2.375 mm

ASMESTD: ASME B94.11M-1993SOURCE: Table 3A · p. 26DESIGNATION: NUMBERSHANK: STRAIGHTFLUTES: 2DATA CHECK: OK

Drawing

Side viewSectionPoint
118°D 2.375 mmF 19 mm (3/4 in)L 44 mm (1 3/4 in)Drawn to scale.

Dimensions

SymbolDimensioninmm
DDiameter0.09352.375
FFlute length3/419
LOverall length1 3/444
BBody length——
SMinimum shank length——
NMaximum neck length——
AShank diameter——
MTMorse taper number—

— : the table gives no value for this drill.

Tolerances (Table 10)

Elementinmm
Point diameter+0.0000 / −0.0005+0.000 / −0.013
Shank diameter+0.0000 / −0.0025+0.000 / −0.064
Back taper per unit flute length0.0000 to 0.00080.000 to 0.020
Flute length F+1/8 / −1/16+3.2 / −1.6
Overall length L+1/8 / −1/16+3.2 / −1.6
Included point angle118° ±5°
Lip height TIV0.00200.051
Centrality of web TIV0.00300.076
Flute spacing TIV0.00300.076
Flute spacing, actual deviation0.00150.038
Max. runout TIR0.006

This diameter in other tables

2.375 mm in every length series that lists it

#42 · Table 1Jobbers length twist drillF 32 mm · L 57 mm#42 · Table 2ATaper length twist drill, through 1/2 in.F 57 mm · L 108 mm

Data check

Result: OK

ASME B94.11M Table 3A, printed page 26 (scan page 32).

All values for #42 (Table 3A)every column of the Designations row
KeyT3A|#42|-
Designation#42
Designation typeNumber
All designations on printed row#42
SeriesT3A
Source tableTable 3A
Drill styleScrew machine length twist drill, through 1 in.
Shank typeStraight
Shank option-
Flutes2 flute
Morse taper no. (A)—
Diameter D (in)0.0935
Diameter equiv. (mm)2.375
Flute length F (in)3/4
Flute length F (mm)19
Overall length L (in)1 3/4
Overall length L (mm)44
Body length B (in)—
Body length B (mm)—
Min shank length S (in)—
Min shank length S (mm)—
Max neck length N (in)—
Max neck length N (mm)—
Shank diameter A (in)—
Shank diameter A (mm)—
Point dia. tol. + (in)0.0000
Point dia. tol. - (in)0.0005
Point dia. tol. + (mm)0.000
Point dia. tol. - (mm)0.013
Shank dia. tol. + (in)0.0000
Shank dia. tol. - (in)0.0025
Shank dia. tol. + (mm)0.000
Shank dia. tol. - (mm)0.064
Back taper per unit flute length (in)0.0000 to 0.0008
Back taper per unit flute length (mm)0.000 to 0.020
F tol. + (in)1/8
F tol. - (in)1/16
F tol. + (mm)3.2
F tol. - (mm)1.6
L tol. + (in)1/8
L tol. - (in)1/16
L tol. + (mm)3.2
L tol. - (mm)1.6
Included point angle (deg)118
Point angle tol.±5°
Lip height TIV (in)0.0020
Lip height TIV (mm)0.051
Centrality of web TIV (in)0.0030
Centrality of web TIV (mm)0.076
Flute spacing TIV (in)0.0030
Flute spacing TIV (mm)0.076
Flute spacing actual dev. (in)0.0015
Flute spacing actual dev. (mm)0.038
Max runout TIR (in) per Table 100.006
Check: D x 25.4 - printed mm0
Check: F in x 25.4 - F mm0.05
Check: L in x 25.4 - L mm0.45
Check resultOK
Notes—
PDF page32
Printed page26

Table 3A: Screw machine length twist drill, through 1 in.

299 drills, smallest first

DrillTypeD inD mmF inF mmL inL mmShank / flutes
1.00 mmMetric0.039411/2131 3/835Straight
#60Number0.041.0161/2131 3/835Straight
#59Number0.0411.0411/2131 3/835Straight
1.05 mmMetric0.04131.051/2131 3/835Straight
#58Number0.0421.0671/2131 3/835Straight
#57Number0.0431.0921/2131 3/835Straight
1.10 mmMetric0.04331.11/2131 3/835Straight
1.15 mmMetric0.04531.151/2131 3/835Straight
#56Number0.04651.1811/2131 3/835Straight
3/64 inFraction0.04691.1911/2131 3/835Straight
1.20 mmMetric0.04721.25/8161 5/841Straight
1.25 mmMetric0.04921.255/8161 5/841Straight
1.30 mmMetric0.05121.35/8161 5/841Straight
#55Number0.0521.3215/8161 5/841Straight
1.35 mmMetric0.05311.355/8161 5/841Straight
#54Number0.0551.3975/8161 5/841Straight
1.40 mmMetric0.05511.45/8161 5/841Straight
1.45 mmMetric0.05711.455/8161 5/841Straight
1.50 mmMetric0.05911.55/8161 5/841Straight
#53Number0.05951.5115/8161 5/841Straight
1.55 mmMetric0.0611.555/8161 5/841Straight
1/16 inFraction0.06251.5885/8161 5/841Straight
1.60 mmMetric0.0631.611/16171 11/1643Straight
#52Number0.06351.61311/16171 11/1643Straight
1.65 mmMetric0.0651.6511/16171 11/1643Straight
1.70 mmMetric0.06691.711/16171 11/1643Straight
#51Number0.0671.70211/16171 11/1643Straight
1.75 mmMetric0.06891.7511/16171 11/1643Straight
#50Number0.071.77811/16171 11/1643Straight
1.80 mmMetric0.07091.811/16171 11/1643Straight
1.85 mmMetric0.07281.8511/16171 11/1643Straight
#49Number0.0731.85411/16171 11/1643Straight
1.90 mmMetric0.07481.911/16171 11/1643Straight
#48Number0.0761.9311/16171 11/1643Straight
1.95 mmMetric0.07681.9511/16171 11/1643Straight
5/64 inFraction0.07811.98411/16171 11/1643Straight
#47Number0.07851.99411/16171 11/1643Straight
2.00 mmMetric0.0787211/16171 11/1643Straight
2.05 mmMetric0.08072.053/4191 3/444Straight
#46Number0.0812.0573/4191 3/444Straight
#45Number0.0822.0833/4191 3/444Straight
2.10 mmMetric0.08272.13/4191 3/444Straight
2.15 mmMetric0.08462.153/4191 3/444Straight
#44Number0.0862.1843/4191 3/444Straight
2.20 mmMetric0.08662.23/4191 3/444Straight
2.25 mmMetric0.08862.253/4191 3/444Straight
#43Number0.0892.2613/4191 3/444Straight
2.30 mmMetric0.09062.33/4191 3/444Straight
2.35 mmMetric0.09252.353/4191 3/444Straight
#42Number0.09352.3753/4191 3/444Straight
3/32 inFraction0.09382.3833/4191 3/444Straight
2.40 mmMetric0.09452.413/16211 13/1646Straight
#41Number0.0962.43813/16211 13/1646Straight
2.45 mmMetric0.09652.4513/16211 13/1646Straight
#40Number0.0982.48913/16211 13/1646Straight
2.50 mmMetric0.09842.513/16211 13/1646Straight
#39Number0.09952.52713/16211 13/1646Straight
#38Number0.10152.57813/16211 13/1646Straight
2.60 mmMetric0.10242.613/16211 13/1646Straight
#37Number0.1042.64213/16211 13/1646Straight
2.70 mmMetric0.10632.713/16211 13/1646Straight
#36Number0.10652.70513/16211 13/1646Straight
7/64 inFraction0.10942.77913/16211 13/1646Straight
#35Number0.112.7947/8221 7/848Straight
2.80 mmMetric0.11022.87/8221 7/848Straight
#34Number0.1112.8197/8221 7/848Straight
#33Number0.1132.877/8221 7/848Straight
2.90 mmMetric0.11422.97/8221 7/848Straight
#32Number0.1162.9467/8221 7/848Straight
3.00 mmMetric0.118137/8221 7/848Straight
#31Number0.123.0487/8221 7/848Straight
3.10 mmMetric0.1223.17/8221 7/848Straight
1/8 inFraction0.1253.1757/8221 7/848Straight
3.20 mmMetric0.1263.215/16241 15/1649Straight
#30Number0.12853.26415/16241 15/1649Straight
3.30 mmMetric0.12993.315/16241 15/1649Straight
3.40 mmMetric0.13393.415/16241 15/1649Straight
#29Number0.1363.45415/16241 15/1649Straight
3.50 mmMetric0.13783.515/16241 15/1649Straight
#28Number0.14053.56915/16241 15/1649Straight
9/64 inFraction0.14063.57115/16241 15/1649Straight
3.60 mmMetric0.14173.61252 1/1652Straight
#27Number0.1443.6581252 1/1652Straight
3.70 mmMetric0.14573.71252 1/1652Straight
#26Number0.1473.7341252 1/1652Straight
#25Number0.14953.7971252 1/1652Straight
3.80 mmMetric0.14963.81252 1/1652Straight
#24Number0.1523.8611252 1/1652Straight
3.90 mmMetric0.15353.91252 1/1652Straight
#23Number0.1543.9121252 1/1652Straight
5/32 inFraction0.15623.9671252 1/1652Straight
#22Number0.1573.9881 1/16272 1/854Straight
4.00 mmMetric0.157541 1/16272 1/854Straight
#21Number0.1594.0391 1/16272 1/854Straight
#20Number0.1614.0891 1/16272 1/854Straight
4.10 mmMetric0.16144.11 1/16272 1/854Straight
4.20 mmMetric0.16544.21 1/16272 1/854Straight
#19Number0.1664.2161 1/16272 1/854Straight
4.30 mmMetric0.16934.31 1/16272 1/854Straight
#18Number0.16954.3051 1/16272 1/854Straight
11/64 inFraction0.17194.3661 1/16272 1/854Straight
#17Number0.1734.3941 1/8292 3/1656Straight
4.40 mmMetric0.17324.41 1/8292 3/1656Straight
#16Number0.1774.4961 1/8292 3/1656Straight
4.50 mmMetric0.17724.51 1/8292 3/1656Straight
#15Number0.184.5721 1/8292 3/1656Straight
4.60 mmMetric0.18114.61 1/8292 3/1656Straight
#14Number0.1824.6231 1/8292 3/1656Straight
#13Number0.1854.71 1/8292 3/1656Straight
4.70 mmMetric0.1854.71 1/8292 3/1656Straight
3/16 inFraction0.18754.7621 1/8292 3/1656Straight
#12Number0.1894.81 3/16302 1/457Straight
4.80 mmMetric0.1894.81 3/16302 1/457Straight
#11Number0.1914.8511 3/16302 1/457Straight
4.90 mmMetric0.19294.91 3/16302 1/457Straight
#10Number0.19354.9151 3/16302 1/457Straight
#9Number0.1964.9781 3/16302 1/457Straight
5.00 mmMetric0.196951 3/16302 1/457Straight
#8Number0.1995.0551 3/16302 1/457Straight
5.10 mmMetric0.20085.11 3/16302 1/457Straight
#7Number0.2015.1051 3/16302 1/457Straight
13/64 inFraction0.20315.1591 3/16302 1/457Straight
#6Number0.2045.1821 1/4322 3/860Straight
5.20 mmMetric0.20475.21 1/4322 3/860Straight
#5Number0.20555.221 1/4322 3/860Straight
5.30 mmMetric0.20875.31 1/4322 3/860Straight
#4Number0.2095.3091 1/4322 3/860Straight
5.40 mmMetric0.21265.41 1/4322 3/860Straight
#3Number0.2135.411 1/4322 3/860Straight
5.50 mmMetric0.21655.51 1/4322 3/860Straight
7/32 inFraction0.21885.5581 1/4322 3/860Straight
5.60 mmMetric0.22055.61 5/16332 7/1662Straight
#2Number0.2215.6131 5/16332 7/1662Straight
5.70 mmMetric0.22445.71 5/16332 7/1662Straight
#1Number0.2285.7911 5/16332 7/1662Straight
5.80 mmMetric0.22835.81 5/16332 7/1662Straight
5.90 mmMetric0.23235.91 5/16332 7/1662Straight
ALetter0.2345.9441 5/16332 7/1662Straight
15/64 inFraction0.23445.9541 5/16332 7/1662Straight
6.00 mmMetric0.236261 3/8352 1/264Straight
BLetter0.2386.0451 3/8352 1/264Straight
6.10 mmMetric0.24026.11 3/8352 1/264Straight
CLetter0.2426.1471 3/8352 1/264Straight
6.20 mmMetric0.24416.21 3/8352 1/264Straight
DLetter0.2466.2481 3/8352 1/264Straight
6.30 mmMetric0.2486.31 3/8352 1/264Straight
ELetter0.256.351 3/8352 1/264Straight
1/4 inFraction0.256.351 3/8352 1/264Straight
6.40 mmMetric0.2526.41 7/16372 5/867Straight
6.50 mmMetric0.25596.51 7/16372 5/867Straight
FLetter0.2576.5281 7/16372 5/867Straight
6.60 mmMetric0.25986.61 7/16372 5/867Straight
GLetter0.2616.6291 7/16372 5/867Straight
6.70 mmMetric0.26386.71 7/16372 5/867Straight
17/64 inFraction0.26566.7461 7/16372 5/867Straight
HLetter0.2666.7561 1/2382 11/1668Straight
6.80 mmMetric0.26776.81 1/2382 11/1668Straight
6.90 mmMetric0.27176.91 1/2382 11/1668Straight
ILetter0.2726.9091 1/2382 11/1668Straight
7.00 mmMetric0.275671 1/2382 11/1668Straight
JLetter0.2777.0361 1/2382 11/1668Straight
7.10 mmMetric0.27957.11 1/2382 11/1668Straight
KLetter0.2817.1371 1/2382 11/1668Straight
9/32 inFraction0.28127.1421 1/2382 11/1668Straight
7.20 mmMetric0.28357.21 9/16402 3/470Straight
7.30 mmMetric0.28747.31 9/16402 3/470Straight
LLetter0.297.3661 9/16402 3/470Straight
7.40 mmMetric0.29137.41 9/16402 3/470Straight
MLetter0.2957.4931 9/16402 3/470Straight
7.50 mmMetric0.29537.51 9/16402 3/470Straight
19/64 inFraction0.29697.5411 9/16402 3/470Straight
7.60 mmMetric0.29927.61 5/8412 13/1671Straight
NLetter0.3027.6711 5/8412 13/1671Straight
7.70 mmMetric0.30317.71 5/8412 13/1671Straight
7.80 mmMetric0.30717.81 5/8412 13/1671Straight
7.90 mmMetric0.3117.91 5/8412 13/1671Straight
5/16 inFraction0.31257.9381 5/8412 13/1671Straight
8.00 mmMetric0.31581 11/16432 15/1675Straight
OLetter0.3168.0261 11/16432 15/1675Straight
8.10 mmMetric0.31898.11 11/16432 15/1675Straight
8.20 mmMetric0.32288.21 11/16432 15/1675Straight
PLetter0.3238.2041 11/16432 15/1675Straight
8.30 mmMetric0.32688.31 11/16432 15/1675Straight
21/64 inFraction0.32818.3341 11/16432 15/1675Straight
8.40 mmMetric0.33078.41 11/1643376Straight
QLetter0.3328.4331 11/1643376Straight
8.50 mmMetric0.33468.51 11/1643376Straight
8.60 mmMetric0.33868.61 11/1643376Straight
RLetter0.3398.6111 11/1643376Straight
8.70 mmMetric0.34258.71 11/1643376Straight
11/32 inFraction0.34388.7331 11/1643376Straight
8.80 mmMetric0.34658.81 3/4443 1/1678Straight
SLetter0.3488.8391 3/4443 1/1678Straight
8.90 mmMetric0.35048.91 3/4443 1/1678Straight
9.00 mmMetric0.354391 3/4443 1/1678Straight
TLetter0.3589.0931 3/4443 1/1678Straight
9.10 mmMetric0.35839.11 3/4443 1/1678Straight
23/64 inFraction0.35949.1291 3/4443 1/1678Straight
9.20 mmMetric0.36229.21 13/16463 1/879Straight
9.30 mmMetric0.36619.31 13/16463 1/879Straight
ULetter0.3689.3471 13/16463 1/879Straight
9.40 mmMetric0.37019.41 13/16463 1/879Straight
9.50 mmMetric0.3749.51 13/16463 1/879Straight
3/8 inFraction0.3759.5251 13/16463 1/879Straight
VLetter0.3779.5761 7/8483 1/483Straight
9.60 mmMetric0.3789.61 7/8483 1/483Straight
9.70 mmMetric0.38199.71 7/8483 1/483Straight
9.80 mmMetric0.38589.81 7/8483 1/483Straight
WLetter0.3869.8041 7/8483 1/483Straight
9.90 mmMetric0.38989.91 7/8483 1/483Straight
25/64 inFraction0.39069.9211 7/8483 1/483Straight
10.00 mmMetric0.3937101 15/16493 5/1684Straight
XLetter0.39710.0841 15/16493 5/1684Straight
10.20 mmMetric0.401610.21 15/16493 5/1684Straight
YLetter0.40410.2621 15/16493 5/1684Straight
13/32 inFraction0.406210.321 15/16493 5/1684Straight
ZLetter0.41310.492513 3/886Straight
10.50 mmMetric0.413410.52513 3/886Straight
27/64 inFraction0.421910.7162513 3/886Straight
10.80 mmMetric0.425210.82 1/16523 7/1687Straight
11.00 mmMetric0.4331112 1/16523 7/1687Straight
7/16 inFraction0.437511.1122 1/16523 7/1687Straight
11.20 mmMetric0.440911.22 1/8543 9/1690Straight
11.50 mmMetric0.452811.52 1/8543 9/1690Straight
29/64 inFraction0.453111.5092 1/8543 9/1690Straight
11.80 mmMetric0.464611.82 1/8543 5/892Straight
15/32 inFraction0.468811.9082 1/8543 5/892Straight
12.00 mmMetric0.4724122 3/16563 11/1694Straight
12.20 mmMetric0.480312.22 3/16563 11/1694Straight
31/64 inFraction0.484412.3042 3/16563 11/1694Straight
12.50 mmMetric0.492112.52 1/4573 3/495Straight
1/2 inFraction0.512.72 1/4573 3/495Straight
12.80 mmMetric0.503912.82 3/8603 7/898Straight
13.00 mmMetric0.5118132 3/8603 7/898Straight
33/64 inFraction0.515613.0962 3/8603 7/898Straight
13.20 mmMetric0.519713.22 3/8603 7/898Straight
17/32 inFraction0.531213.4922 3/8603 7/898Straight
13.50 mmMetric0.531513.52 3/8603 7/898Straight
13.80 mmMetric0.543313.82 1/2644102Straight
35/64 inFraction0.546913.8912 1/2644102Straight
14.00 mmMetric0.5512142 1/2644102Straight
14.25 mmMetric0.56114.252 1/2644102Straight
9/16 inFraction0.562514.2882 1/2644102Straight
14.50 mmMetric0.570914.52 5/8674 1/8105Straight
37/64 inFraction0.578114.6842 5/8674 1/8105Straight
14.75 mmMetric0.580714.752 5/8674 1/8105Straight
15.00 mmMetric0.5906152 5/8674 1/8105Straight
19/32 inFraction0.593815.0832 5/8674 1/8105Straight
15.25 mmMetric0.600415.252 3/4704 1/4108Straight
39/64 inFraction0.609415.4792 3/4704 1/4108Straight
15.50 mmMetric0.610215.52 3/4704 1/4108Straight
15.75 mmMetric0.620115.752 3/4704 1/4108Straight
5/8 inFraction0.62515.8152 3/4704 1/4108Straight
16.00 mmMetric0.6299162 7/8734 1/2114Straight
16.25 mmMetric0.639816.252 7/8734 1/2114Straight
41/64 inFraction0.640616.2712 7/8734 1/2114Straight
16.50 mmMetric0.649616.52 7/8734 1/2114Straight
21/32 inFraction0.656216.6672 7/8734 1/2114Straight
16.75 mmMetric0.659416.752 7/8734 5/8117Straight
17.00 mmMetric0.6693172 7/8734 5/8117Straight
43/64 inFraction0.671917.0662 7/8734 5/8117Straight
17.25 mmMetric0.679117.252 7/8734 5/8117Straight
11/16 inFraction0.687517.4622 7/8734 5/8117Straight
17.50 mmMetric0.68917.53764 3/4121Straight
45/64 inFraction0.703117.8593764 3/4121Straight
18.00 mmMetric0.7087183764 3/4121Straight
23/32 inFraction0.718818.2583764 3/4121Straight
18.50 mmMetric0.728318.53 1/8795127Straight
47/64 inFraction0.734418.6543 1/8795127Straight
19.00 mmMetric0.748193 1/8795127Straight
3/4 inFraction0.7519.053 1/8795127Straight
49/64 inFraction0.765619.4463 1/4835 1/8130Straight
19.50 mmMetric0.767719.53 1/4835 1/8130Straight
25/32 inFraction0.781219.8453 1/4835 1/8130Straight
20.00 mmMetric0.7874203 3/8865 1/4133Straight
51/64 inFraction0.796920.2413 3/8865 1/4133Straight
20.50 mmMetric0.807120.53 3/8865 1/4133Straight
13/16 inFraction0.812520.6383 3/8865 1/4133Straight
21.00 mmMetric0.8268213 1/2895 3/8137Straight
53/64 inFraction0.828121.0343 1/2895 3/8137Straight
27/32 inFraction0.843821.4333 1/2895 3/8137Straight
21.50 mmMetric0.846521.53 1/2895 1/2140Straight
55/64 inFraction0.859421.8293 1/2895 1/2140Straight
22.00 mmMetric0.8661223 1/2895 1/2140Straight
7/8 inFraction0.87522.2253 1/2895 1/2140Straight
22.50 mmMetric0.885822.53 5/8925 5/8143Straight
57/64 inFraction0.890622.6213 5/8925 5/8143Straight
23.00 mmMetric0.9055233 5/8925 5/8143Straight
29/32 inFraction0.906223.0173 5/8925 5/8143Straight
59/64 inFraction0.921923.4163 3/4955 3/4146Straight
23.50 mmMetric0.925223.53 3/4955 3/4146Straight
15/16 inFraction0.937523.8123 3/4955 3/4146Straight
24.00 mmMetric0.9449243 7/8985 7/8149Straight
61/64 inFraction0.953124.2093 7/8985 7/8149Straight
24.50 mmMetric0.964624.53 7/8985 7/8149Straight
31/32 inFraction0.968824.6083 7/8985 7/8149Straight
25.00 mmMetric0.98432541026152Straight
63/64 inFraction0.984425.00441026152Straight
1 inFraction125.441026152Straight
Table 3A as tabulatedone line per printed row, every column
Designation(s) on printed rowD (in)Equiv. (mm)F (in)F (mm)L (in)L (mm)NotesPDF pagePrinted page
1.00 mm0.039411/2131 3/835—3125
#600.041.0161/2131 3/835—3125
#590.0411.0411/2131 3/835—3125
1.05 mm0.04131.051/2131 3/835—3125
#580.0421.0671/2131 3/835—3125
#570.0431.0921/2131 3/835—3125
1.10 mm0.04331.11/2131 3/835—3125
1.15 mm0.04531.151/2131 3/835—3125
#560.04651.1811/2131 3/835—3125
3/64 in0.04691.1911/2131 3/835—3125
1.20 mm0.04721.25/8161 5/841—3125
1.25 mm0.04921.255/8161 5/841—3125
1.30 mm0.05121.35/8161 5/841—3125
#550.0521.3215/8161 5/841—3125
1.35 mm0.05311.355/8161 5/841—3125
#540.0551.3975/8161 5/841dec/mmeq mismatch; manual dec=0.055 (page image)3125
1.40 mm0.05511.45/8161 5/841—3125
1.45 mm0.05711.455/8161 5/841—3125
1.50 mm0.05911.55/8161 5/841—3125
#530.05951.5115/8161 5/841—3125
1.55 mm0.0611.555/8161 5/841—3125
1/16 in0.06251.5885/8161 5/841—3125
1.60 mm0.0631.611/16171 11/1643—3125
#520.06351.61311/16171 11/1643—3125
1.65 mm0.0651.6511/16171 11/1643—3125
1.70 mm0.06691.711/16171 11/1643—3226
#510.0671.70211/16171 11/1643—3226
1.75 mm0.06891.7511/16171 11/1643—3226
#500.071.77811/16171 11/1643—3226
1.80 mm0.07091.811/16171 11/1643—3226
1.85 mm0.07281.8511/16171 11/1643—3226
#490.0731.85411/16171 11/1643—3226
1.90 mm0.07481.911/16171 11/1643—3226
#480.0761.9311/16171 11/1643—3226
1.95 mm0.07681.9511/16171 11/1643—3226
5/64 in0.07811.98411/16171 11/1643—3226
#470.07851.99411/16171 11/1643—3226
2.00 mm0.0787211/16171 11/1643—3226
2.05 mm0.08072.053/4191 3/444—3226
#460.0812.0573/4191 3/444—3226
#450.0822.0833/4191 3/444—3226
2.10 mm0.08272.13/4191 3/444—3226
2.15 mm0.08462.153/4191 3/444—3226
#440.0862.1843/4191 3/444—3226
2.20 mm0.08662.23/4191 3/444—3226
2.25 mm0.08862.253/4191 3/444—3226
#430.0892.2613/4191 3/444—3226
2.30 mm0.09062.33/4191 3/444—3226
2.35 mm0.09252.353/4191 3/444—3226
#420.09352.3753/4191 3/444—3226
3/32 in0.09382.3833/4191 3/444—3226
2.40 mm0.09452.413/16211 13/1646—3226
#410.0962.43813/16211 13/1646—3226
2.45 mm0.09652.4513/16211 13/1646—3226
#400.0982.48913/16211 13/1646—3226
2.50 mm0.09842.513/16211 13/1646—3226
#390.09952.52713/16211 13/1646—3226
#380.10152.57813/16211 13/1646—3226
2.60 mm0.10242.613/16211 13/1646—3226
#370.1042.64213/16211 13/1646—3226
2.70 mm0.10632.713/16211 13/1646—3226
#360.10652.70513/16211 13/1646—3226
7/64 in0.10942.77913/16211 13/1646dec<-mmeq3226
#350.112.7947/8221 7/848—3226
2.80 mm0.11022.87/8221 7/848—3226
#340.1112.8197/8221 7/848—3327
#330.1132.877/8221 7/848—3327
2.90 mm0.11422.97/8221 7/848—3327
#320.1162.9467/8221 7/848—3327
3.00 mm0.118137/8221 7/848—3327
#310.123.0487/8221 7/848—3327
3.10 mm0.1223.17/8221 7/848—3327
1/8 in0.1253.1757/8221 7/848—3327
3.20 mm0.1263.215/16241 15/1649—3327
#300.12853.26415/16241 15/1649—3327
3.30 mm0.12993.315/16241 15/1649—3327
3.40 mm0.13393.415/16241 15/1649—3327
#290.1363.45415/16241 15/1649—3327
3.50 mm0.13783.515/16241 15/1649—3327
#280.14053.56915/16241 15/1649—3327
9/64 in0.14063.57115/16241 15/1649—3327
3.60 mm0.14173.61252 1/1652—3327
#270.1443.6581252 1/1652—3327
3.70 mm0.14573.71252 1/1652—3327
#260.1473.7341252 1/1652—3327
#250.14953.7971252 1/1652—3327
3.80 mm0.14963.81252 1/1652—3327
#240.1523.8611252 1/1652—3327
3.90 mm0.15353.91252 1/1652—3327
#230.1543.9121252 1/1652—3327
5/32 in0.15623.9671252 1/1652—3327
#220.1573.9881 1/16272 1/854—3327
4.00 mm0.157541 1/16272 1/854—3327
#210.1594.0391 1/16272 1/854—3327
#200.1614.0891 1/16272 1/854—3327
4.10 mm0.16144.11 1/16272 1/854—3327
4.20 mm0.16544.21 1/16272 1/854—3327
#190.1664.2161 1/16272 1/854—3327
4.30 mm0.16934.31 1/16272 1/854—3327
#180.16954.3051 1/16272 1/854—3327
11/64 in0.17194.3661 1/16272 1/854—3327
#170.1734.3941 1/8292 3/1656—3327
4.40 mm0.17324.41 1/8292 3/1656—3327
#160.1774.4961 1/8292 3/1656—3327
4.50 mm0.17724.51 1/8292 3/1656—3327
#150.184.5721 1/8292 3/1656—3428
4.60 mm0.18114.61 1/8292 3/1656—3428
#140.1824.6231 1/8292 3/1656—3428
#13, 4.70 mm0.1854.71 1/8292 3/1656—3428
3/16 in0.18754.7621 1/8292 3/1656—3428
#12, 4.80 mm0.1894.81 3/16302 1/457dec<-mmeq3428
#110.1914.8511 3/16302 1/457—3428
4.90 mm0.19294.91 3/16302 1/457—3428
#100.19354.9151 3/16302 1/457—3428
#90.1964.9781 3/16302 1/457—3428
5.00 mm0.196951 3/16302 1/457—3428
#80.1995.0551 3/16302 1/457—3428
5.10 mm0.20085.11 3/16302 1/457—3428
#70.2015.1051 3/16302 1/457—3428
13/64 in0.20315.1591 3/16302 1/457—3428
#60.2045.1821 1/4322 3/860—3428
5.20 mm0.20475.21 1/4322 3/860—3428
#50.20555.221 1/4322 3/860—3428
5.30 mm0.20875.31 1/4322 3/860—3428
#40.2095.3091 1/4322 3/860—3428
5.40 mm0.21265.41 1/4322 3/860—3428
#30.2135.411 1/4322 3/860—3428
5.50 mm0.21655.51 1/4322 3/860—3428
7/32 in0.21885.5581 1/4322 3/860—3428
5.60 mm0.22055.61 5/16332 7/1662—3428
#20.2215.6131 5/16332 7/1662—3428
5.70 mm0.22445.71 5/16332 7/1662—3428
#10.2285.7911 5/16332 7/1662—3428
5.80 mm0.22835.81 5/16332 7/1662—3428
5.90 mm0.23235.91 5/16332 7/1662—3428
A0.2345.9441 5/16332 7/1662—3428
15/64 in0.23445.9541 5/16332 7/1662—3428
6.00 mm0.236261 3/8352 1/264—3428
B0.2386.0451 3/8352 1/264—3428
6.10 mm0.24026.11 3/8352 1/264—3428
C0.2426.1471 3/8352 1/264—3428
6.20 mm0.24416.21 3/8352 1/264—3428
D0.2466.2481 3/8352 1/264—3428
6.30 mm0.2486.31 3/8352 1/264—3428
E, 1/4 in0.256.351 3/8352 1/264—3428
6.40 mm0.2526.41 7/16372 5/867—3529
6.50 mm0.25596.51 7/16372 5/867—3529
F0.2576.5281 7/16372 5/867—3529
6.60 mm0.25986.61 7/16372 5/867—3529
G0.2616.6291 7/16372 5/867—3529
6.70 mm0.26386.71 7/16372 5/867—3529
17/64 in0.26566.7461 7/16372 5/867—3529
H0.2666.7561 1/2382 11/1668—3529
6.80 mm0.26776.81 1/2382 11/1668—3529
6.90 mm0.27176.91 1/2382 11/1668—3529
I0.2726.9091 1/2382 11/1668—3529
7.00 mm0.275671 1/2382 11/1668—3529
J0.2777.0361 1/2382 11/1668—3529
7.10 mm0.27957.11 1/2382 11/1668mmeq<-metric label3529
K0.2817.1371 1/2382 11/1668—3529
9/32 in0.28127.1421 1/2382 11/1668—3529
7.20 mm0.28357.21 9/16402 3/470—3529
7.30 mm0.28747.31 9/16402 3/470—3529
L0.297.3661 9/16402 3/470—3529
7.40 mm0.29137.41 9/16402 3/470—3529
M0.2957.4931 9/16402 3/470—3529
7.50 mm0.29537.51 9/16402 3/470—3529
19/64 in0.29697.5411 9/16402 3/470—3529
7.60 mm0.29927.61 5/8412 13/1671—3529
N0.3027.6711 5/8412 13/1671—3529
7.70 mm0.30317.71 5/8412 13/1671—3529
7.80 mm0.30717.81 5/8412 13/1671—3529
7.90 mm0.3117.91 5/8412 13/1671—3529
5/16 in0.31257.9381 5/8412 13/1671—3529
8.00 mm0.31581 11/16432 15/1675—3529
O0.3168.0261 11/16432 15/1675—3529
8.10 mm0.31898.11 11/16432 15/1675—3529
8.20 mm0.32288.21 11/16432 15/1675—3529
P0.3238.2041 11/16432 15/1675—3529
8.30 mm0.32688.31 11/16432 15/1675—3529
21/64 in0.32818.3341 11/16432 15/1675—3529
8.40 mm0.33078.41 11/1643376—3529
Q0.3328.4331 11/1643376—3529
8.50 mm0.33468.51 11/1643376—3529
8.60 mm0.33868.61 11/1643376—3529
R0.3398.6111 11/1643376—3630
8.70 mm0.34258.71 11/1643376—3630
11/32 in0.34388.7331 11/1643376—3630
8.80 mm0.34658.81 3/4443 1/1678—3630
S0.3488.8391 3/4443 1/1678—3630
8.90 mm0.35048.91 3/4443 1/1678—3630
9.00 mm0.354391 3/4443 1/1678—3630
T0.3589.0931 3/4443 1/1678—3630
9.10 mm0.35839.11 3/4443 1/1678—3630
23/64 in0.35949.1291 3/4443 1/1678—3630
9.20 mm0.36229.21 13/16463 1/879—3630
9.30 mm0.36619.31 13/16463 1/879—3630
U0.3689.3471 13/16463 1/879—3630
9.40 mm0.37019.41 13/16463 1/879—3630
9.50 mm0.3749.51 13/16463 1/879—3630
3/8 in0.3759.5251 13/16463 1/879—3630
V0.3779.5761 7/8483 1/483—3630
9.60 mm0.3789.61 7/8483 1/483—3630
9.70 mm0.38199.71 7/8483 1/483—3630
9.80 mm0.38589.81 7/8483 1/483—3630
W0.3869.8041 7/8483 1/483—3630
9.90 mm0.38989.91 7/8483 1/483—3630
25/64 in0.39069.9211 7/8483 1/483—3630
10.00 mm0.3937101 15/16493 5/1684—3630
X0.39710.0841 15/16493 5/1684—3630
10.20 mm0.401610.21 15/16493 5/1684—3630
Y0.40410.2621 15/16493 5/1684—3630
13/32 in0.406210.321 15/16493 5/1684dec/mmeq mismatch; printed mm equivalent 10.320 differs from decimal x 25.4 = 10.3173630
Z0.41310.492513 3/886—3630
10.50 mm0.413410.52513 3/886—3630
27/64 in0.421910.7162513 3/886—3630
10.80 mm0.425210.82 1/16523 7/1687—3630
11.00 mm0.4331112 1/16523 7/1687mmeq<-metric label; manual Lmm=87.0 (page image)3630
7/16 in0.437511.1122 1/16523 7/1687—3630
11.20 mm0.440911.22 1/8543 9/1690—3630
11.50 mm0.452811.52 1/8543 9/1690—3630
29/64 in0.453111.5092 1/8543 9/1690—3630
11.80 mm0.464611.82 1/8543 5/892—3630
15/32 in0.468811.9082 1/8543 5/892—3630
12.00 mm0.4724122 3/16563 11/1694—3630
12.20 mm0.480312.22 3/16563 11/1694—3731
31/64 in0.484412.3042 3/16563 11/1694—3731
12.50 mm0.492112.52 1/4573 3/495—3731
1/2 in0.512.72 1/4573 3/495—3731
12.80 mm0.503912.82 3/8603 7/898—3731
13.00 mm0.5118132 3/8603 7/898—3731
33/64 in0.515613.0962 3/8603 7/898—3731
13.20 mm0.519713.22 3/8603 7/898—3731
17/32 in0.531213.4922 3/8603 7/898—3731
13.50 mm0.531513.52 3/8603 7/898—3731
13.80 mm0.543313.82 1/2644102—3731
35/64 in0.546913.8912 1/2644102—3731
14.00 mm0.5512142 1/2644102—3731
14.25 mm0.56114.252 1/2644102—3731
9/16 in0.562514.2882 1/2644102—3731
14.50 mm0.570914.52 5/8674 1/8105—3731
37/64 in0.578114.6842 5/8674 1/8105—3731
14.75 mm0.580714.752 5/8674 1/8105—3731
15.00 mm0.5906152 5/8674 1/8105—3731
19/32 in0.593815.0832 5/8674 1/8105—3731
15.25 mm0.600415.252 3/4704 1/4108—3731
39/64 in0.609415.4792 3/4704 1/4108—3731
15.50 mm0.610215.52 3/4704 1/4108—3731
15.75 mm0.620115.752 3/4704 1/4108—3731
5/8 in0.62515.8152 3/4704 1/4108dec/mmeq mismatch; printed mm equivalent 15.815 differs from decimal x 25.4 = 15.8753731
16.00 mm0.6299162 7/8734 1/2114—3731
16.25 mm0.639816.252 7/8734 1/2114—3731
41/64 in0.640616.2712 7/8734 1/2114—3731
16.50 mm0.649616.52 7/8734 1/2114—3731
21/32 in0.656216.6672 7/8734 1/2114—3731
16.75 mm0.659416.752 7/8734 5/8117—3731
17.00 mm0.6693172 7/8734 5/8117—3731
43/64 in0.671917.0662 7/8734 5/8117—3731
17.25 mm0.679117.252 7/8734 5/8117—3731
11/16 in0.687517.4622 7/8734 5/8117—3731
17.50 mm0.68917.53764 3/4121—3731
45/64 in0.703117.8593764 3/4121—3731
18.00 mm0.7087183764 3/4121—3731
23/32 in0.718818.2583764 3/4121—3731
18.50 mm0.728318.53 1/8795127—3731
47/64 in0.734418.6543 1/8795127—3832
19.00 mm0.748193 1/8795127—3832
3/4 in0.7519.053 1/8795127—3832
49/64 in0.765619.4463 1/4835 1/8130—3832
19.50 mm0.767719.53 1/4835 1/8130—3832
25/32 in0.781219.8453 1/4835 1/8130dec/mmeq mismatch; printed mm equivalent 19.845 differs from decimal x 25.4 = 19.8423832
20.00 mm0.7874203 3/8865 1/4133dec<-mmeq3832
51/64 in0.796920.2413 3/8865 1/4133—3832
20.50 mm0.807120.53 3/8865 1/4133—3832
13/16 in0.812520.6383 3/8865 1/4133—3832
21.00 mm0.8268213 1/2895 3/8137—3832
53/64 in0.828121.0343 1/2895 3/8137—3832
27/32 in0.843821.4333 1/2895 3/8137—3832
21.50 mm0.846521.53 1/2895 1/2140—3832
55/64 in0.859421.8293 1/2895 1/2140—3832
22.00 mm0.8661223 1/2895 1/2140—3832
7/8 in0.87522.2253 1/2895 1/2140—3832
22.50 mm0.885822.53 5/8925 5/8143—3832
57/64 in0.890622.6213 5/8925 5/8143—3832
23.00 mm0.9055233 5/8925 5/8143—3832
29/32 in0.906223.0173 5/8925 5/8143—3832
59/64 in0.921923.4163 3/4955 3/4146—3832
23.50 mm0.925223.53 3/4955 3/4146—3832
15/16 in0.937523.8123 3/4955 3/4146—3832
24.00 mm0.9449243 7/8985 7/8149—3832
61/64 in0.953124.2093 7/8985 7/8149—3832
24.50 mm0.964624.53 7/8985 7/8149—3832
31/32 in0.968824.6083 7/8985 7/8149—3832
25.00 mm0.98432541026152—3832
63/64 in0.984425.00441026152—3832
1 in125.441026152—3832

Drill types in the standard

One drill of each table, drawn from its own values; click to open it

Table 1: Jobbers length twist drill

330 rows · example #18, 4.305 mm, L 83 mm

Table 2A: Taper length twist drill, through 1/2 in.

185 rows · example 4.00 mm, 4 mm, L 146 mm

Table 2B: Taper length twist drill, over 1/2 in.

120 rows · example 24.00 mm, 24 mm, L 279 mm

Table 3A: Screw machine length twist drill, through 1 in.

299 rows · example 6.50 mm, 6.5 mm, L 67 mm

Table 3B: Screw machine length twist drill, over 1 in. (reduced shank)

30 rows · example 1 1/2 in, 38.1 mm, L 190 mm

Table 5: Taper shank twist drill

380 rows · example 1 5/64 in, 27.384 mm, L 318 mm

Table 7: Core drill, straight shank

38 rows · example 21/32 in, 16.667 mm, L 229 mm

Table 8: Core drill, taper shank

86 rows · example 1 1/32 in, 26.192 mm, L 283 mm

Combined drills and countersinks (Table 9A)

C 4.76 mm (3/16 in)L 70 mm (2 3/4 in)D 4.76A 11.11One end shown; countersink and bell angles drawn nominally (not dimensioned in Table 9A).

Plain type, size 5, printed page 54

TypeSizeA inA mmD inD mmE inE mmC inC mmL inL mm
Plain003/322.38.0250.64--.0300.761 1/829
Plain03/322.381/320.79--.0380.971 1/829
Plain11/83.183/641.19--3/641.191 1/432
Plain23/164.765/641.98--5/641.981 7/848
Plain31/46.357/642.78--7/642.78251
Plain45/167.941/83.18--1/83.182 1/854
Plain57/1611.113/164.76--3/164.762 3/470
Plain61/212.77/325.56--7/325.56376
Plain75/815.881/46.35--1/46.353 1/483
Plain83/419.055/167.94--5/167.943 1/289
Bell111/83.183/641.190.102.53/641.191 1/432
Bell123/164.761/161.590.153.81/161.591 7/848
Bell131/46.353/322.380.205.13/322.38251
Bell145/167.947/642.780.256.47/642.782 1/454
Bell157/1611.115/323.970.358.15/323.972 3/470
Bell161/212.73/164.760.4010.23/164.76376
Bell175/815.887/325.560.5012.77/325.563 1/483
Bell183/419.051/46.350.6015.21/46.353 1/289

Tolerances, tangs, split points, checks and errata

Tables 4, 6, 9B and 10 and the data checks of the workbook

Drill diameter at point

TABLE 10 Element tolerances for high speed steel general purpose twist drills (and TABLE 9B for combined drills and countersinks). 95% of drills in any one lot to fall within the tolerance (General notes, p.57-60 of the standard). Dimensions in inches and mm as printed.

Diameter range (in)Diameter range (mm)Plus (+) inMinus (-) inPlus (+) mmMinus (-) mm
From #97 through #81From 0.15 through 0.330.00020.00020.0050.005
Over #81 through 1/8Over 0.33 through 3.180.00000.00050.0000.013
Over 1/8 through 1/4Over 3.18 through 6.350.00000.00070.0000.018
Over 1/4 through 1/2Over 6.35 through 12.700.00000.00100.0000.025
Over 1/2 through 1Over 12.70 through 25.400.00000.00120.0000.030
Over 1 through 2Over 25.40 through 50.800.00000.00150.0000.038
Over 2 through 3 1/2Over 50.80 through 88.900.00000.00200.0000.051
Shank diameter (straight shank drills) - first row is printed with "Minus (-)" under both values
Diameter range (in)Diameter range (mm)Plus (+) inMinus (-) inPlus (+) mmMinus (-) mm
From #97 through #81From 0.15 through 0.330.0002 (minus)0.00020.005 (minus)0.005
Over #81 through 1/8Over 0.33 through 3.180.00000.00250.0000.064
Over 1/8 through 1/4Over 3.18 through 6.350.00050.00300.0130.076
Over 1/4 through 1/2Over 6.35 through 12.700.00050.00450.0130.114
Over 1/2 through 2Over 12.70 through 50.800.00050.00300.0130.076
Back taper - tolerance per unit of flute length
Diameter range (in)Diameter range (mm)Tolerance (in)Tolerance (mm)
From #97 through #81From 0.15 through 0.33NoneNone
Over #81 through 1/8Over 0.33 through 3.180.0000 to 0.00080.000 to 0.020
Over 1/8 through 1/4Over 3.18 through 6.350.0002 to 0.00080.005 to 0.020
Over 1/4 through 1/2Over 6.35 through 12.700.0002 to 0.00090.005 to 0.022
Over 1/2 through 1Over 12.70 through 25.400.0003 to 0.00110.007 to 0.028
Over 1 through 3 1/2Over 25.40 through 88.900.0004 to 0.00150.010 to 0.038
Flute length
Diameter range (in)Diameter range (mm)Plus (+) inMinus (-) inPlus (+) mmMinus (-) mm
From #97 through #81From 0.15 through 0.331/641/640.40.4
Over #81 through 1/8Over 0.33 through 3.181/81/163.21.6
Over 1/8 through 1/2Over 3.18 through 12.701/81/83.23.2
Over 1/2 through 1Over 12.70 through 25.401/41/86.43.2
Over 1 through 2Over 25.40 through 50.801/41/46.46.4
Over 2 through 3 1/2Over 50.80 through 88.903/83/89.59.5
Overall length
Diameter range (in)Diameter range (mm)Plus (+) inMinus (-) inPlus (+) mmMinus (-) mm
From #97 through #81From 0.15 through 0.331/321/320.80.8
Over #81 through 1/8Over 0.33 through 3.181/81/163.21.6
Over 1/8 through 1/2Over 3.18 through 12.701/81/83.23.2
Over 1/2 through 1Over 12.70 through 25.401/41/86.43.2
Over 1 through 2Over 25.40 through 50.801/41/46.46.4
Over 2 through 3 1/2Over 50.80 through 88.903/83/89.59.5
Included angle of point
Diameter range (in)Diameter range (mm)Included angle (deg)Tolerance
From 1/16 through 1/2From 1.59 through 12.70118±5°
Over 1/2 through 1 1/2Over 12.70 through 38.10118±3°
Over 1 1/2 through 3 1/2Over 38.10 through 88.90118±2°
Lip height / Centrality of web / Flute spacing (TIV = total indicator variation)
Diameter range (in)Diameter range (mm)Lip height TIV (in)Lip height TIV (mm)Centrality of web TIV (in)Centrality of web TIV (mm)Flute spacing TIV (in)Flute spacing TIV (mm)Flute spacing actual deviation (in)Flute spacing actual deviation (mm)
From 1/16 through 1/8From 1.59 through 3.180.00200.0510.00300.0760.00300.0760.00150.038
Over 1/8 through 1/4Over 3.18 through 6.350.00300.0760.00400.1020.00600.1520.00300.076
Over 1/4 through 1/2Over 6.35 through 12.700.00400.1020.00500.1270.01000.2540.00500.127
Over 1/2 through 1Over 12.70 through 25.400.00500.1270.00700.1780.01400.3560.00700.178
Over 1 through 3 1/2Over 25.40 through 88.900.00600.1520.01000.2540.02600.6600.01300.330
Runout (straightness) - maximum TIR formulas (rounded to nearest 0.001 in.; dimensions in inches)
Drill length seriesApplies to drillsFormulaMaximum allowed TIR (in)
Jobbers length0.03125 in. and larger (smaller: manufacturer's discretion)0.0001316 x (overall length / drill diameter) + 0.00368-
Taper length0.03125 in. and larger (smaller: manufacturer's discretion)0.000375 x (overall length / drill diameter) + 0.00270.02
Screw machine length0.0400 in. and larger (smaller: manufacturer's discretion)0.0001316 x (overall length / drill diameter) + 0.003680.007
Runout - 6 in. aircraft drills (maximum TIR, in)
Diameter range (in)Maximum TIR (in)
.0400-.0624.020
.0625-.1249.015
.1250-.2499.012
.2500-.3749.010
.3750-.4999.007
.5000.005
Runout - 12 in. aircraft drills (maximum TIR, in)
Diameter range (in)Maximum TIR (in)
.0400-.0624.040
.0625-.1934.035
.1935-.5000.025
Runout - taper shank (maximum TIR, in)
Diameter range (in)Maximum TIR (in)
.1250-.3749.015
.3750-1.4999.010
1.5000 and larger.007
TABLE 9B Tolerances of combined drills and countersinks
ElementSize designationsPlus (+) inMinus (-) inPlus (+) mmMinus (-) mm
Body diameter (A)All sizes0.00000.00200.0000.051
Drill length (C)000.0050.0050.130.13
Drill length (C)0 through 2 and 11 and 120.0080.0080.200.20
Drill length (C)3 through 8 and 13 through 181/641/640.40.4
Drill diameter (D)All sizes0.00300.00000.0760.000
Overall length (L)All sizes1/321/160.81.6
TABLE 4 General dimensions of tangs for straight shank drills (A = nominal diameter of drill shank, J = thickness of tang, K = length of tang)
A range (in)A range (mm)J max (in)J min (in)J max (mm)J min (mm)K (in)K (mm)
1/8 through 3/163.18 through 4.760.0940.0902.392.299/327.0
Over 3/16 through 1/4Over 4.76 through 6.350.1220.1183.103.005/168.0
Over 1/4 through 5/16Over 6.35 through 7.940.1620.1584.114.0111/328.5
Over 5/16 through 3/8Over 7.94 through 9.530.2030.1995.165.063/89.5
Over 3/8 through 15/32Over 9.53 through 11.910.2430.2396.176.077/1611.0
Over 15/32 through 9/16Over 11.91 through 14.290.3030.2977.707.551/212.5
Over 9/16 through 21/32Over 14.29 through 16.670.3730.3679.479.329/1614.5
Over 21/32 through 3/4Over 16.67 through 19.050.4430.43711.2511.105/816.0
Over 3/4 through 7/8Over 19.05 through 22.230.5140.50813.0512.9011/1617.5
Over 7/8 through 1Over 22.23 through 25.400.6090.60115.4715.273/419.0
Over 1 through 1 3/16Over 25.40 through 30.160.7000.69217.7817.5813/1620.5
Over 1 3/16 through 1 3/8Over 30.16 through 34.930.8170.80920.7520.557/822.0
Concentricity of tang (T.I.V.)
Thickness of tang T (in)Thickness of tang T (mm)T.I.V. (in)T.I.V. (mm)
From 0.090 through 0.243From 2.29 through 6.170.0060.16
Over 0.243 through 0.443Over 6.17 through 11.250.0070.18
Over 0.443 through 0.609Over 11.25 through 15.470.0080.21
Over 0.609 through 0.817Over 15.47 through 20.750.0090.23
TABLE 6 Split point drill grinding (source cited by the standard: NAS 907, 14 Feb 1986). W2 given as min/max. Dimensions in inches.
Range (drill diameter, in)A = 118 deg lip reliefA = 135 deg lip reliefE lip heightW2 web after notchingR max radius in notchG alignment of secondary cutting edgesC chisel edge centrality
1/16 - #4120 deg ±3 deg16 deg ±3 deg.002 T.I.V..002/.005.005.002.002
#40 - 1/817 deg ±2 deg14 deg ±2 deg.002 T.I.V..002/.005.007.003.002
Over 1/8 - 1/414 deg ±2 deg14 deg ±2 deg.002 T.I.V..002/.005.010.003.002
Over 1/4 - 1/212 deg ±2 deg12 deg ±2 deg.002 T.I.V..002/.009.015.004.004
Over 1/2 - 3/412 deg ±2 deg10 deg ±2 deg.004 T.I.V..003/.012.020.005.004
Over 3/4 - 111 deg ±2 deg8 deg ±2 deg.004 T.I.V..005/.020.025.007.004

Split point figure notes: notching wheel dressed to 110 deg +/-5 deg; 118 deg point: 115 deg +5/-10 deg and 132 deg +10/-5 deg angles as drawn; secondary relief 50 deg +10/-0 deg; 3-8 deg lip relief angle shown.

Row-count reconciliation (rows counted from the page images vs rows in this workbook)
TablePrinted rows (counted on the pages)Rows in "Tbl" sheetDifferenceRows in Designations (one per designation / shank option / flute count)
Table 13193190330
Table 2A1831830185
Table 2B1201200120
Table 3A2962960299
Table 3B3030030
Table 52762760380
Table 73030038
Table 86161086

Where the "printed rows" figure comes from: each page was split into blocks of five rows; the block structure was checked page by page and the same diameters were found independently in Tables 1 and 3A (229 rows between 0.0394 and 0.5000 in.).

Values that are wrong or inconsistent AS PRINTED in the standard (kept as printed; do not "correct" without checking the source)
TableRowWhat is printed
Table 117/32 inprinted mm equivalent 13.494 differs from decimal x 25.4 = 13.492
Table 3A13/32 inprinted mm equivalent 10.320 differs from decimal x 25.4 = 10.317
Table 3A5/8 inprinted mm equivalent 15.815 differs from decimal x 25.4 = 15.875
Table 3A25/32 inprinted mm equivalent 19.845 differs from decimal x 25.4 = 19.842
Table 55/8 inprinted mm equivalent 15.815 differs from decimal x 25.4 = 15.875
Table 517.50 mmprinted mm equivalent 17.500 differs from decimal x 25.4 = 17.475
Table 515/16 inprinted mm equivalent 23.862 differs from decimal x 25.4 = 23.812
Table 52 3/16 inprinted mm equivalent 55.512 differs from decimal x 25.4 = 55.562
Table 556.00 mmprinted mm equivalent 56.000 differs from decimal x 25.4 = 55.880
Table 7/85/16 inprinted decimal 0.3175 differs from 5/16 in = 0.3125
Table 7/813/32 inprinted mm equivalent 10.217 differs from computed 10.319
Table 7/85/8 inprinted mm equivalent 15.815 differs from computed 15.875
Table 7/829/32 inprinted mm equivalent 23.000 differs from computed 23.019
Table 7/81 15/32 inprinted decimal 1.4683 differs from 1 15/32 in = 1.4688
Table 7/81 15/32 inprinted mm equivalent 37.300 differs from computed 37.306
Table 7/81 9/16 inprinted decimal 1.5675 differs from 1 9/16 in = 1.5625
Table 7/81 23/32 inprinted decimal 1.8438 differs from 1 23/32 in = 1.7188
Table 7/81 23/32 inprinted mm equivalent 43.658 differs from computed 43.656
Table 7/81 25/32 inprinted mm equivalent 45.262 differs from computed 45.244
Table 7/81 27/32 inprinted decimal 1.0000 differs from 1 27/32 in = 1.8438
Table 7/81 27/32 inprinted mm equivalent 46.833 differs from computed 46.831
Table 52 1/4 in? row printed "2.2500" in the Shank-smaller table at 3 1/4 inprinted decimal 2.2500 is a typo for 3.2500 (mm equivalent 82.550 agrees with 3.2500)
Manual corrections made while reading the scanned pages (value read from the page image because the scan text was damaged)
Table 1#75manual Fmm=6.0 (page image)
Table 11.10 mmmanual Fmm=19.0 (page image)
Table 11.15 mmmanual Fmm=19.0 (page image)
Table 1#56manual Fmm=19.0 (page image)
Table 13/64 inmanual Fmm=19.0 (page image)
Table 11.20 mmmanual Fmm=22.0 (page image)
Table 11.25 mmmanual Fmm=22.0 (page image)
Table 12.20 mmmanual Fmm=32.0 (page image)
Table 12.20 mmmanual Lmm=57.0 (page image)
Table 1#22manual Lmm=79.0 (page image)
Table 14.20 mmmanual Fmm=54.0 (page image)
Table 14.20 mmmanual Lmm=83.0 (page image)
Table 14.90 mmmanual Fmm=62.0 (page image)
Table 15.00 mmmanual Fmm=62.0 (page image)
Table 115/32 inmanual mmeq=11.908 (page image)
Table 141/64 inmanual Fmm=132.0 (page image)
Table 141/64 inmanual Lmm=181.0 (page image)
Table 116.50 mmmanual Fmm=132.0 (page image)
Table 116.50 mmmanual Lmm=181.0 (page image)
Table 121/32 inmanual Fmm=132.0 (page image)
Table 121/32 inmanual Lmm=181.0 (page image)
Table 116.75 mmmanual Fmm=143.0 (page image)
Table 116.75 mmmanual Lmm=194.0 (page image)
Table 143/64 inmanual Fmm=143.0 (page image)
Table 143/64 inmanual Lmm=194.0 (page image)
Table 117.25 mmmanual Fmm=143.0 (page image)
Table 117.25 mmmanual Lmm=194.0 (page image)
Table 111/16 inmanual Fmm=143.0 (page image)
Table 111/16 inmanual Lmm=194.0 (page image)
Table 117.50 mmmanual Fmm=143.0 (page image)
Table 117.50 mmmanual Lmm=194.0 (page image)
Table 2A#57manual mmeq=1.092 (page image)
Table 2A#10manual Fmm=92.0 (page image)
Table 2A#10manual Lmm=152.0 (page image)
Table 2A#9manual Fmm=92.0 (page image)
Table 2A#9manual Lmm=152.0 (page image)
Table 2A5.10 mmmanual Fmm=92.0 (page image)
Table 2A5.10 mmmanual Lmm=152.0 (page image)
Table 2A13/64 inmanual Fmm=92.0 (page image)
Table 2A13/64 inmanual Lmm=152.0 (page image)
Table 2A5.60 mmF: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A#2F: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A#1F: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A5.90 mmF: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A15/64 inF: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A6.00 mmF: stray digit removed (OCR 956 -> 95; image shows 95)
Table 2A25/64 inmanual Fmm=111.0 (page image)
Table 2A25/64 inmanual Lmm=178.0 (page image)
Table 2A27/64 inmanual Fmm=117.0 (page image)
Table 2A27/64 inmanual Lmm=184.0 (page image)
Table 2B26.50 mmmanual mmeq=26.5 (page image)
Table 2B36.00 mmmanual Bmm=235.0 (page image)
Table 2B1 15/32 inmanual Bmm=238.0 (page image)
Table 3A#54manual dec=0.055 (page image)
Table 3A11.00 mmmanual Lmm=87.0 (page image)
Sizes index: all 501 drill diametersevery designation of each diameter and the tables that list it
Diameter (in)Equivalent (mm)NumberLetterFractionMetricIn Table 1In Table 2AIn Table 2BIn Table 3AIn Table 3BIn Table 5In Table 7In Table 8
0.00590.15#97——0.15 mmx———————
0.00630.16#96——0.16 mmx———————
0.00670.17#95——0.17 mmx———————
0.00710.18#94——0.18 mmx———————
0.00750.19#93——0.19 mmx———————
0.00790.201#92——0.20 mmx———————
0.00830.211#91———x———————
0.00870.221#90——0.22 mmx———————
0.00910.231#89———x———————
0.00950.241#88———x———————
0.00980.25———0.25 mmx———————
0.010.254#87———x———————
0.01050.267#86———x———————
0.0110.28#85——0.28 mmx———————
0.01150.292#84———x———————
0.01180.3———0.30 mmx———————
0.0120.305#83———x———————
0.01250.318#82———x———————
0.01260.32———0.32 mmx———————
0.0130.33#81———x———————
0.01350.343#80———x———————
0.01380.35———0.35 mmx———————
0.01450.368#79———x———————
0.0150.38———0.38 mmx———————
0.01560.396——1/64 in—x———————
0.01570.4———0.40 mmx———————
0.0160.406#78———x———————
0.01650.42———0.42 mmx———————
0.01770.45———0.45 mmx———————
0.0180.457#77———x———————
0.01890.48———0.48 mmx———————
0.01970.5———0.50 mmx———————
0.020.508#76———x———————
0.0210.533#75———x———————
0.02170.55———0.55 mmx———————
0.02250.572#74———x———————
0.02360.6———0.60 mmx———————
0.0240.61#73———x———————
0.0250.635#72———x———————
0.02560.65———0.65 mmx———————
0.0260.66#71———x———————
0.02760.7———0.70 mmx———————
0.0280.711#70———x———————
0.02920.742#69———x———————
0.02950.75———0.75 mmx———————
0.0310.787#68———x———————
0.03120.792——1/32 in—x———————
0.03150.8———0.80 mmx———————
0.0320.813#67———x———————
0.0330.838#66———x———————
0.03350.85———0.85 mmx———————
0.0350.889#65———x———————
0.03540.899———0.90 mmx———————
0.0360.914#64———x———————
0.0370.94#63———x———————
0.03740.95———0.95 mmx———————
0.0380.965#62———x———————
0.0390.991#61———x———————
0.03941———1.00 mmxx—x————
0.041.016#60———xx—x————
0.0411.041#59———xx—x————
0.04131.05———1.05 mmxx—x————
0.0421.067#58———xx—x————
0.0431.092#57———xx—x————
0.04331.1———1.10 mmxx—x————
0.04531.15———1.15 mmxx—x————
0.04651.181#56———xx—x————
0.04691.191——3/64 in—xx—x————
0.04721.2———1.20 mmxx—x————
0.04921.25———1.25 mmxx—x————
0.05121.3———1.30 mmxx—x————
0.0521.321#55———xx—x————
0.05311.35———1.35 mmxx—x————
0.0551.397#54———xx—x————
0.05511.4———1.40 mmxx—x————
0.05711.45———1.45 mmxx—x————
0.05911.5———1.50 mmxx—x————
0.05951.511#53———xx—x————
0.0611.55———1.55 mmxx—x————
0.06251.588——1/16 in—xx—x————
0.0631.6———1.60 mmxx—x————
0.06351.613#52———xx—x————
0.0651.65———1.65 mmxx—x————
0.06691.7———1.70 mmxx—x————
0.0671.702#51———xx—x————
0.06891.75———1.75 mmxx—x————
0.071.778#50———xx—x————
0.07091.8———1.80 mmxx—x————
0.07281.85———1.85 mmxx—x————
0.0731.854#49———xx—x————
0.07481.9———1.90 mmxx—x————
0.0761.93#48———xx—x————
0.07681.95———1.95 mmxx—x————
0.07811.984——5/64 in—xx—x————
0.07851.994#47———xx—x————
0.07872———2.00 mmxx—x————
0.08072.05———2.05 mmxx—x————
0.0812.057#46———xx—x————
0.0822.083#45———xx—x————
0.08272.1———2.10 mmxx—x————
0.08462.15———2.15 mmxx—x————
0.0862.184#44———xx—x————
0.08662.2———2.20 mmxx—x————
0.08862.25———2.25 mmxx—x————
0.0892.261#43———xx—x————
0.09062.3———2.30 mmxx—x————
0.09252.35———2.35 mmxx—x————
0.09352.375#42———xx—x————
0.09382.383——3/32 in—xx—x————
0.09452.4———2.40 mmxx—x————
0.0962.438#41———xx—x————
0.09652.45———2.45 mmxx—x————
0.0982.489#40———xx—x————
0.09842.5———2.50 mmxx—x————
0.09952.527#39———xx—x————
0.10152.578#38———xx—x————
0.10242.6———2.60 mmxx—x————
0.1042.642#37———xx—x————
0.10632.7———2.70 mmxx—x————
0.10652.705#36———xx—x————
0.10942.779——7/64 in—xx—x————
0.112.794#35———xx—x————
0.11022.8———2.80 mmxx—x————
0.1112.819#34———xx—x————
0.1132.87#33———xx—x————
0.11422.9———2.90 mmxx—x————
0.1162.946#32———xx—x————
0.11813———3.00 mmxx—x—x——
0.123.048#31———xx—x————
0.1223.1———3.10 mmxx—x————
0.1253.175——1/8 in—xx—x—x——
0.1263.2———3.20 mmxx—x—x——
0.12853.264#30———xx—x————
0.12993.3———3.30 mmxx—x————
0.13393.4———3.40 mmxx—x————
0.1363.454#29———xx—x————
0.13783.5———3.50 mmxx—x—x——
0.14053.569#28———xx—x————
0.14063.571——9/64 in—xx—x—x——
0.14173.6———3.60 mmxx—x————
0.1443.658#27———xx—x————
0.14573.7———3.70 mmxx—x————
0.1473.734#26———xx—x————
0.14953.797#25———xx—x————
0.14963.8———3.80 mmxx—x—x——
0.1523.861#24———xx—x————
0.15353.9———3.90 mmxx—x————
0.1543.912#23———xx—x————
0.15623.967——5/32 in—xx—x—x——
0.1573.988#22———xx—x————
0.15754———4.00 mmxx—x—x——
0.1594.039#21———xx—x————
0.1614.089#20———xx—x————
0.16144.1———4.10 mmxx—x————
0.16544.2———4.20 mmxx—x—x——
0.1664.216#19———xx—x————
0.16934.3———4.30 mmxx—x————
0.16954.305#18———xx—x————
0.17194.366——11/64 in—xx—x—x——
0.1734.394#17———xx—x————
0.17324.4———4.40 mmxx—x————
0.1774.496#16———xx—x————
0.17724.5———4.50 mmxx—x—x——
0.184.572#15———xx—x————
0.18114.6———4.60 mmxx—x————
0.1824.623#14———xx—x————
0.1854.7#13——4.70 mmxx—x————
0.18754.762——3/16 in—xx—x—x——
0.1894.8#12——4.80 mmxx—x—x——
0.1914.851#11———xx—x————
0.19294.9———4.90 mmxx—x————
0.19354.915#10———xx—x————
0.1964.978#9———xx—x————
0.19695———5.00 mmxx—x—x——
0.1995.055#8———xx—x————
0.20085.1———5.10 mmxx—x————
0.2015.105#7———xx—x————
0.20315.159——13/64 in—xx—x—x——
0.2045.182#6———xx—x————
0.20475.2———5.20 mmxx—x—x——
0.20555.22#5———xx—x————
0.20875.3———5.30 mmxx—x————
0.2095.309#4———xx—x————
0.21265.4———5.40 mmxx—x————
0.2135.41#3———xx—x————
0.21655.5———5.50 mmxx—x—x——
0.21885.558——7/32 in—xx—x—x——
0.22055.6———5.60 mmxx—x————
0.2215.613#2———xx—x————
0.22445.7———5.70 mmxx—x————
0.2285.791#1———xx—x————
0.22835.8———5.80 mmxx—x—x——
0.23235.9———5.90 mmxx—x————
0.2345.944—A——x——x————
0.23445.954——15/64 in—xx—x—x——
0.23626———6.00 mmxx—x—x——
0.2386.045—B——x——x————
0.24026.1———6.10 mmxx—x————
0.2426.147—C——x——x————
0.24416.2———6.20 mmxx—x—x——
0.2466.248—D——x——x————
0.2486.3———6.30 mmxx—x————
0.256.35—E1/4 in—xx—x—xxx
0.2526.4———6.40 mmxx—x————
0.25596.5———6.50 mmxx—x—x——
0.2576.528—F——x——x————
0.25986.6———6.60 mmx——x————
0.2616.629—G——x——x————
0.26386.7———6.70 mmx——x————
0.26566.746——17/64 in—xx—x—x——
0.2666.756—H——x——x————
0.26776.8———6.80 mmxx—x—x——
0.27176.9———6.90 mmx——x————
0.2726.909—I——x——x————
0.27567———7.00 mmxx—x—x——
0.2777.036—J——x——x————
0.27957.1———7.10 mmx——x————
0.2817.137—K——x——x————
0.28127.142——9/32 in—xx—x—xxx
0.28357.2———7.20 mmxx—x—x——
0.28747.3———7.30 mmx——x————
0.297.366—L——x——x————
0.29137.4———7.40 mmx——x————
0.2957.493—M——x——x————
0.29537.5———7.50 mmxx—x—x——
0.29697.541——19/64 in—xx—x—x——
0.29927.6———7.60 mmx——x————
0.3027.671—N——x——x————
0.30317.7———7.70 mmx——x————
0.30717.8———7.80 mmxx—x—x——
0.3117.9———7.90 mmx——x————
0.31257.938——5/16 in—xx—x—xxx
0.3158———8.00 mmxx—x—x——
0.3168.026—O——x——x————
0.31898.1———8.10 mmx——x————
0.32288.2———8.20 mmxx—x—x——
0.3238.204—P——x——x————
0.32688.3———8.30 mmx——x————
0.32818.334——21/64 in—xx—x—x——
0.33078.4———8.40 mmx——x————
0.3328.433—Q——x——x————
0.33468.5———8.50 mmxx—x—x——
0.33868.6———8.60 mmx——x————
0.3398.611—R——x——x————
0.34258.7———8.70 mmx——x————
0.34388.733——11/32 in—xx—x—xxx
0.34658.8———8.80 mmxx—x—x——
0.3488.839—S——x——x————
0.35048.9———8.90 mmx——x————
0.35439———9.00 mmxx—x—x——
0.3589.093—T——x——x————
0.35839.1———9.10 mmx——x————
0.35949.129——23/64 in—xx—x—x——
0.36229.2———9.20 mmxx—x—x——
0.36619.3———9.30 mmx——x————
0.3689.347—U——x——x————
0.37019.4———9.40 mmx——x————
0.3749.5———9.50 mmxx—x—x——
0.3759.525——3/8 in—xx—x—xxx
0.3779.576—V——x——x————
0.3789.6———9.60 mmx——x————
0.38199.7———9.70 mmx——x————
0.38589.8———9.80 mmxx—x—x——
0.3869.804—W——x——x————
0.38989.9———9.90 mmx——x————
0.39069.921——25/64 in—xx—x—x——
0.393710———10.00 mmxx—x—x——
0.39710.084—X——x——x————
0.401610.2———10.20 mmxx—x—x——
0.40410.262—Y——x——x————
0.406210.32——13/32 in—xx—x——xx
0.406310.319——13/32 in——————x——
0.41310.49—Z——x——x————
0.413410.5———10.50 mmxx—x—x——
0.421910.716——27/64 in—xx—x—x——
0.425210.8———10.80 mmxx—x—x——
0.433111———11.00 mmxx—x—x——
0.437511.112——7/16 in—xx—x—xxx
0.440911.2———11.20 mmxx—x—x——
0.452811.5———11.50 mmxx—x—x——
0.453111.509——29/64 in—xx—x—x——
0.464611.8———11.80 mmxx—x—x——
0.468811.908——15/32 in—xx—x—xxx
0.472412———12.00 mmxx—x—x——
0.480312.2———12.20 mmxx—x—x——
0.484412.304——31/64 in—xx—x—x——
0.492112.5———12.50 mmxx—x—x——
0.512.7——1/2 in—xx—x—xxx
0.503912.8———12.80 mmx—xx—x——
0.511813———13.00 mmx—xx—x——
0.515613.096——33/64 in—x—xx—x——
0.519713.2———13.20 mmx—xx—x——
0.531213.492——17/32 in—x—xx—xxx
0.531513.5———13.50 mmx—xx—x——
0.543313.8———13.80 mmx—xx—x——
0.546913.891——35/64 in—x—xx—x——
0.551214———14.00 mmx—xx—x——
0.56114.25———14.25 mmx—xx—x——
0.562514.288——9/16 in—x—xx—xxx
0.570914.5———14.50 mmx—xx—x——
0.578114.684——37/64 in—x—xx—x——
0.580714.75———14.75 mmx—xx—x——
0.590615———15.00 mmx—xx—x——
0.593815.083——19/32 in—x—xx—xxx
0.600415.25———15.25 mmx—xx—x——
0.609415.479——39/64 in—x—xx—x——
0.610215.5———15.50 mmx—xx—x——
0.620115.75———15.75 mmx—xx—x——
0.62515.815——5/8 in—x—xx—xxx
0.629916———16.00 mmx—xx—x——
0.639816.25———16.25 mmx—xx—x——
0.640616.271——41/64 in—x—xx—x——
0.649616.5———16.50 mmx—xx—x——
0.656216.667——21/32 in—x—xx—xxx
0.659416.75———16.75 mmx—xx—x——
0.669317———17.00 mmx—xx—x——
0.671917.066——43/64 in—x—xx—x——
0.679117.25———17.25 mmx—xx—x——
0.687517.462——11/16 in—x—xx—xxx
0.68817.5———17.50 mm—————x——
0.68917.5———17.50 mmx—xx————
0.703117.859——45/64 in———xx—x——
0.708718———18.00 mm——xx—x——
0.718818.258——23/32 in———xx—xxx
0.728318.5———18.50 mm——xx—x——
0.734418.654——47/64 in———xx—x——
0.74819———19.00 mm——xx—x——
0.7519.05——3/4 in———xx—xxx
0.765619.446——49/64 in———xx—x——
0.767719.5———19.50 mm——xx—x——
0.781219.845——25/32 in———xx—xxx
0.787420———20.00 mm——xx—x——
0.796920.241——51/64 in———xx—x——
0.807120.5———20.50 mm——xx—x——
0.812520.638——13/16 in———xx—xxx
0.826821———21.00 mm——xx—x——
0.828121.034——53/64 in———xx—x——
0.843821.433——27/32 in———xx—xxx
0.846521.5———21.50 mm——xx—x——
0.859421.829——55/64 in———xx—x——
0.866122———22.00 mm——xx—x——
0.87522.225——7/8 in———xx—xxx
0.885822.5———22.50 mm——xx—x——
0.890622.621——57/64 in———xx—x——
0.905523———23.00 mm——xx—x——
0.906223.017——29/32 in———xx—xxx
0.921923.416——59/64 in———xx—x——
0.925223.5———23.50 mm——xx—x——
0.937523.812——15/16 in———xx—xxx
0.944924———24.00 mm——xx—x——
0.953124.209——61/64 in———xx—x——
0.964624.5———24.50 mm——xx—x——
0.968824.608——31/32 in———xx—xxx
0.984325———25.00 mm——xx—x——
0.984425.004——63/64 in———xx—x——
125.4——1 in———xx—xxx
1.003925.5———25.50 mm——x—xx——
1.015625.796——1 1/64 in———x——x——
1.023626———26.00 mm——x—xx——
1.031226.192——1 1/32 in———x——xxx
1.043326.5———26.50 mm——x——x——
1.046926.591——1 3/64 in———x——x——
1.062526.988——1 1/16 in———x—xxxx
1.06327———27.00 mm——x——x——
1.078127.384——1 5/64 in———x——x——
1.082727.5———27.50 mm——x——x——
1.093827.783——1 3/32 in———x——xxx
1.102428———28.00 mm——x—xx——
1.109428.179——1 7/64 in———x——x——
1.12228.5———28.50 mm——x——x——
1.12528.575——1 1/8 in———x—xxxx
1.140628.971——1 9/64 in———x——x——
1.141729———29.00 mm——x——x——
1.156229.367——1 5/32 in———x——x—x
1.161429.5———29.50 mm——x——x——
1.171929.766——1 11/64 in———x——x——
1.181130———30.00 mm——x—xx——
1.187530.162——1 3/16 in———x—xx—x
1.200830.5———30.50 mm——x——x——
1.203130.559——1 13/64 in———x——x——
1.218830.958——1 7/32 in———x——x—x
1.220531———31.00 mm——x——x——
1.234431.354——1 15/64 in———x——x——
1.240231.5———31.50 mm——x——x——
1.2531.75——1 1/4 in———x—xxxx
1.259832———32.00 mm——x—xx——
1.265632.146——1 17/64 in——————x——
1.279532.5———32.50 mm——x——x——
1.281232.542——1 9/32 in———x——x—x
1.296932.941——1 19/64 in——————x——
1.299233———33.00 mm——x——x——
1.312533.338——1 5/16 in———x—xx—x
1.318933.5———33.50 mm——x——x——
1.328133.734——1 21/64 in——————x——
1.338634———34.00 mm——x—xx——
1.343834.133——1 11/32 in———x——x—x
1.358334.5———34.50 mm——x——x——
1.359434.529——1 23/64 in——————x——
1.37534.925——1 3/8 in———x—xx—x
1.37835———35.00 mm——x——x——
1.390635.321——1 25/64 in——————x——
1.397635.5———35.50 mm——x——x——
1.406235.717——1 13/32 in———x——x—x
1.417336———36.00 mm——x—xx——
1.421936.116——1 27/64 in——————x——
1.43736.5———36.50 mm——x——x——
1.437536.512——1 7/16 in———x—xx—x
1.453136.909——1 29/64 in——————x——
1.456737———37.00 mm——x——x——
1.468837.308——1 15/32 in———x——x—x
1.476437.5———37.50 mm——x——x——
1.484437.704——1 31/64 in——————x——
1.496138———38.00 mm——x—xx——
1.538.1——1 1/2 in———x—xx—x
1.515638.496——1 33/64 in——————x——
1.531238.892——1 17/32 in——————x—x
1.535439———39.00 mm—————x——
1.546939.291——1 35/64 in——————x——
1.562539.688——1 9/16 in———x—xx—x
1.574840———40.00 mm————xx——
1.578140.084——1 37/64 in——————x——
1.593840.483——1 19/32 in——————x—x
1.609440.879——1 39/64 in——————x——
1.614241———41.00 mm—————x——
1.62541.275——1 5/8 in———x—xx—x
1.640641.671——1 41/64 in——————x——
1.653542———42.00 mm————xx——
1.656242.067——1 21/32 in——————x—x
1.671942.466——1 43/64 in——————x——
1.687542.862——1 11/16 in—————xx—x
1.692943———43.00 mm—————x——
1.703143.259——1 45/64 in——————x——
1.718843.658——1 23/32 in——————x—x
1.732344———44.00 mm————xx——
1.734444.054——1 47/64 in——————x——
1.7544.45——1 3/4 in———x—xx—x
1.771745———45.00 mm—————x——
1.781245.242——1 25/32 in——————x—x
1.81146———46.00 mm————xx——
1.812546.038——1 13/16 in—————xx—x
1.843846.833——1 27/32 in——————x—x
1.850447———47.00 mm—————x——
1.87547.625——1 7/8 in—————xx—x
1.889848———48.00 mm————xx——
1.906248.417——1 29/32 in——————x—x
1.929149———49.00 mm—————x——
1.937549.212——1 15/16 in—————xx—x
1.968550———50.00 mm————xx——
1.968850.008——1 31/32 in——————x—x
250.8——2 in—————xx—x
2.007951———51.00 mm—————x——
2.031251.592——2 1/32 in——————x——
2.047252———52.00 mm—————x——
2.062552.388——2 1/16 in——————x——
2.086653———53.00 mm—————x——
2.093853.183——2 3/32 in——————x——
2.12553.975——2 1/8 in——————x—x
2.12654———54.00 mm—————x——
2.156254.767——2 5/32 in——————x——
2.165455———55.00 mm—————x——
2.187555.512——2 3/16 in——————x——
2.256———56.00 mm—————x——
2.218856.358——2 7/32 in——————x——
2.244157———57.00 mm—————x——
2.2557.15——2 1/4 in——————x—x
2.283558———58.00 mm—————x——
2.312558.738——2 5/16 in——————x——
2.322859———59.00 mm—————x——
2.362260———60.00 mm—————x——
2.37560.325——2 3/8 in——————x—x
2.401661———61.00 mm—————x——
2.437561.912——2 7/16 in——————x——
2.440962———62.00 mm—————x——
2.480363———63.00 mm—————x——
2.563.5——2 1/2 in——————x—x
2.519764———64.00 mm—————x——
2.559165———65.00 mm—————x——
2.562565.088——2 9/16 in——————x——
2.598466———66.00 mm—————x——
2.62566.675——2 5/8 in——————x——
2.637867———67.00 mm—————x——
2.677268———68.00 mm—————x——
2.687568.262——2 11/16 in——————x——
2.716569———69.00 mm—————x——
2.7569.85——2 3/4 in——————x——
2.755970———70.00 mm—————x——
2.795371———71.00 mm—————x——
2.812571.438——2 13/16 in——————x——
2.834672———72.00 mm—————x——
2.87473———73.00 mm—————x——
2.87573.025——2 7/8 in——————x——
2.913474———74.00 mm—————x——
2.937574.612——2 15/16 in——————x——
2.952875———75.00 mm—————x——
2.992176———76.00 mm—————x——
376.2——3 in——————x——
3.031577———77.00 mm—————x——
3.070978———78.00 mm—————x——
3.12579.375——3 1/8 in——————x——
3.2582.55——3 1/4 in——————x——
3.588.9——3 1/2 in——————x——

Tapped-hole drills for common threads

Each thread page lists the drills that fit within the minor diameter limits of its internal thread

Related tools

About these values

Sizes, lengths and tolerances are tabulated from ASME B94.11M-1993, Twist Drills (Tables 1 to 10); each drill shows its table and printed page. A drill standard has no thread class or internal/external side: there is one row per designation, per shank option (taper shank drills) and per flute count (core drills).

Inch fractions of the lengths are given in the standard; where the scan could not be read they were re-derived from the printed millimetre value. Values printed inconsistently in the standard are kept as printed and marked on the drill. The drawings are our own schematics made from these values, not reproductions of the standard's figures.

Not a substitute for the standard: check the current edition of ASME B94.11M before ordering or inspecting tools.