#1 Taper length twist drill, through 1/2 in.

D 0.228 in · 5.791 mm

ASMESTD: ASME B94.11M-1993SOURCE: Table 2A · p. 19DESIGNATION: NUMBERSHANK: STRAIGHTFLUTES: 2DATA CHECK: OK

Drawing

Side viewSectionPointTang
118°D 5.791 mmF 95 mm (3 3/4 in)L 156 mm (6 1/8 in)Drawn to scale.

Dimensions

SymbolDimensioninmm
DDiameter0.2285.791
FFlute length3 3/495
LOverall length6 1/8156
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 / −0.0007+0.000 / −0.018
Shank diameter+0.0005 / −0.0030+0.013 / −0.076
Back taper per unit flute length0.0002 to 0.00080.005 to 0.020
Flute length F+1/8 / −1/8+3.2 / −3.2
Overall length L+1/8 / −1/8+3.2 / −3.2
Included point angle118° ±5°
Lip height TIV0.00300.076
Centrality of web TIV0.00400.102
Flute spacing TIV0.00600.152
Flute spacing, actual deviation0.00300.076
Max. runout TIR0.013

This diameter in other tables

5.791 mm in every length series that lists it

#1 · Table 1Jobbers length twist drillF 67 mm · L 98 mm#1 · Table 3AScrew machine length twist drill, through 1 in.F 33 mm · L 62 mm

Data check

Result: OK

Note: F: stray digit removed (OCR 956 -> 95; image shows 95)

ASME B94.11M Table 2A, printed page 19 (scan page 25).

All values for #1 (Table 2A)every column of the Designations row
KeyT2A|#1|-
Designation#1
Designation typeNumber
All designations on printed row#1
SeriesT2A
Source tableTable 2A
Drill styleTaper length twist drill, through 1/2 in.
Shank typeStraight
Shank option-
Flutes2 flute
Morse taper no. (A)—
Diameter D (in)0.228
Diameter equiv. (mm)5.791
Flute length F (in)3 3/4
Flute length F (mm)95
Overall length L (in)6 1/8
Overall length L (mm)156
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)0.0007
Point dia. tol. + (mm)0.000
Point dia. tol. - (mm)0.018
Shank dia. tol. + (in)0.0005
Shank dia. tol. - (in)0.0030
Shank dia. tol. + (mm)0.013
Shank dia. tol. - (mm)0.076
Back taper per unit flute length (in)0.0002 to 0.0008
Back taper per unit flute length (mm)0.005 to 0.020
F tol. + (in)1/8
F tol. - (in)1/8
F tol. + (mm)3.2
F tol. - (mm)3.2
L tol. + (in)1/8
L tol. - (in)1/8
L tol. + (mm)3.2
L tol. - (mm)3.2
Included point angle (deg)118
Point angle tol.±5°
Lip height TIV (in)0.0030
Lip height TIV (mm)0.076
Centrality of web TIV (in)0.0040
Centrality of web TIV (mm)0.102
Flute spacing TIV (in)0.0060
Flute spacing TIV (mm)0.152
Flute spacing actual dev. (in)0.0030
Flute spacing actual dev. (mm)0.076
Max runout TIR (in) per Table 100.013
Check: D x 25.4 - printed mm0
Check: F in x 25.4 - F mm0.25
Check: L in x 25.4 - L mm-0.43
Check resultOK
NotesF: stray digit removed (OCR 956 -> 95; image shows 95)
PDF page25
Printed page19

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

185 drills, smallest first

DrillTypeD inD mmF inF mmL inL mmShank / flutes
1.00 mmMetric0.039411 1/8292 1/457Straight
#60Number0.041.0161 1/8292 1/457Straight
#59Number0.0411.0411 1/8292 1/457Straight
1.05 mmMetric0.04131.051 1/8292 1/457Straight
#58Number0.0421.0671 1/8292 1/457Straight
#57Number0.0431.0921 1/8292 1/457Straight
1.10 mmMetric0.04331.11 1/8292 1/457Straight
1.15 mmMetric0.04531.151 1/8292 1/457Straight
#56Number0.04651.1811 1/8292 1/457Straight
3/64 inFraction0.04691.1911 1/8292 1/457Straight
1.20 mmMetric0.04721.21 3/444376Straight
1.25 mmMetric0.04921.251 3/444376Straight
1.30 mmMetric0.05121.31 3/444376Straight
#55Number0.0521.3211 3/444376Straight
1.35 mmMetric0.05311.351 3/444376Straight
#54Number0.0551.3971 3/444376Straight
1.40 mmMetric0.05511.41 3/444376Straight
1.45 mmMetric0.05711.451 3/444376Straight
1.50 mmMetric0.05911.51 3/444376Straight
#53Number0.05951.5111 3/444376Straight
1.55 mmMetric0.0611.551 3/444376Straight
1/16 inFraction0.06251.5881 3/444376Straight
1.60 mmMetric0.0631.62513 3/495Straight
#52Number0.06351.6132513 3/495Straight
1.65 mmMetric0.0651.652513 3/495Straight
1.70 mmMetric0.06691.72513 3/495Straight
#51Number0.0671.7022513 3/495Straight
1.75 mmMetric0.06891.752513 3/495Straight
#50Number0.071.7782513 3/495Straight
1.80 mmMetric0.07091.82513 3/495Straight
1.85 mmMetric0.07281.852513 3/495Straight
#49Number0.0731.8542513 3/495Straight
1.90 mmMetric0.07481.92513 3/495Straight
#48Number0.0761.932513 3/495Straight
1.95 mmMetric0.07681.952513 3/495Straight
5/64 inFraction0.07811.9842513 3/495Straight
#47Number0.07851.9942 1/4574 1/4108Straight
2.00 mmMetric0.078722 1/4574 1/4108Straight
2.05 mmMetric0.08072.052 1/4574 1/4108Straight
#46Number0.0812.0572 1/4574 1/4108Straight
#45Number0.0822.0832 1/4574 1/4108Straight
2.10 mmMetric0.08272.12 1/4574 1/4108Straight
2.15 mmMetric0.08462.152 1/4574 1/4108Straight
#44Number0.0862.1842 1/4574 1/4108Straight
2.20 mmMetric0.08662.22 1/4574 1/4108Straight
2.25 mmMetric0.08862.252 1/4574 1/4108Straight
#43Number0.0892.2612 1/4574 1/4108Straight
2.30 mmMetric0.09062.32 1/4574 1/4108Straight
2.35 mmMetric0.09252.352 1/4574 1/4108Straight
#42Number0.09352.3752 1/4574 1/4108Straight
3/32 inFraction0.09382.3832 1/4574 1/4108Straight
2.40 mmMetric0.09452.42 1/2644 5/8117Straight
#41Number0.0962.4382 1/2644 5/8117Straight
2.45 mmMetric0.09652.452 1/2644 5/8117Straight
#40Number0.0982.4892 1/2644 5/8117Straight
2.50 mmMetric0.09842.52 1/2644 5/8117Straight
#39Number0.09952.5272 1/2644 5/8117Straight
#38Number0.10152.5782 1/2644 5/8117Straight
2.60 mmMetric0.10242.62 1/2644 5/8117Straight
#37Number0.1042.6422 1/2644 5/8117Straight
2.70 mmMetric0.10632.72 1/2644 5/8117Straight
#36Number0.10652.7052 1/2644 5/8117Straight
7/64 inFraction0.10942.7792 1/2644 5/8117Straight
#35Number0.112.7942 3/4705 1/8130Straight
2.80 mmMetric0.11022.82 3/4705 1/8130Straight
#34Number0.1112.8192 3/4705 1/8130Straight
#33Number0.1132.872 3/4705 1/8130Straight
2.90 mmMetric0.11422.92 3/4705 1/8130Straight
#32Number0.1162.9462 3/4705 1/8130Straight
3.00 mmMetric0.118132 3/4705 1/8130Straight
#31Number0.123.0482 3/4705 1/8130Straight
3.10 mmMetric0.1223.12 3/4705 1/8130Straight
1/8 inFraction0.1253.1752 3/4705 1/8130Straight
3.20 mmMetric0.1263.23765 3/8137Straight
#30Number0.12853.2643765 3/8137Straight
3.30 mmMetric0.12993.33765 3/8137Straight
3.40 mmMetric0.13393.43765 3/8137Straight
#29Number0.1363.4543765 3/8137Straight
3.50 mmMetric0.13783.53765 3/8137Straight
#28Number0.14053.5693765 3/8137Straight
9/64 inFraction0.14063.5713765 3/8137Straight
3.60 mmMetric0.14173.63765 3/8137Straight
#27Number0.1443.6583765 3/8137Straight
3.70 mmMetric0.14573.73765 3/8137Straight
#26Number0.1473.7343765 3/8137Straight
#25Number0.14953.7973765 3/8137Straight
3.80 mmMetric0.14963.83765 3/8137Straight
#24Number0.1523.8613765 3/8137Straight
3.90 mmMetric0.15353.93765 3/8137Straight
#23Number0.1543.9123765 3/8137Straight
5/32 inFraction0.15623.9673765 3/8137Straight
#22Number0.1573.9883 3/8865 3/4146Straight
4.00 mmMetric0.157543 3/8865 3/4146Straight
#21Number0.1594.0393 3/8865 3/4146Straight
#20Number0.1614.0893 3/8865 3/4146Straight
4.10 mmMetric0.16144.13 3/8865 3/4146Straight
4.20 mmMetric0.16544.23 3/8865 3/4146Straight
#19Number0.1664.2163 3/8865 3/4146Straight
4.30 mmMetric0.16934.33 3/8865 3/4146Straight
#18Number0.16954.3053 3/8865 3/4146Straight
11/64 inFraction0.17194.3663 3/8865 3/4146Straight
#17Number0.1734.3943 3/8865 3/4146Straight
4.40 mmMetric0.17324.43 3/8865 3/4146Straight
#16Number0.1774.4963 3/8865 3/4146Straight
4.50 mmMetric0.17724.53 3/8865 3/4146Straight
#15Number0.184.5723 3/8865 3/4146Straight
4.60 mmMetric0.18114.63 3/8865 3/4146Straight
#14Number0.1824.6233 3/8865 3/4146Straight
#13Number0.1854.73 3/8865 3/4146Straight
4.70 mmMetric0.1854.73 3/8865 3/4146Straight
3/16 inFraction0.18754.7623 3/8865 3/4146Straight
#12Number0.1894.83 5/8926152Straight
4.80 mmMetric0.1894.83 5/8926152Straight
#11Number0.1914.8513 5/8926152Straight
4.90 mmMetric0.19294.93 5/8926152Straight
#10Number0.19354.9153 5/8926152Straight
#9Number0.1964.9783 5/8926152Straight
5.00 mmMetric0.196953 5/8926152Straight
#8Number0.1995.0553 5/8926152Straight
5.10 mmMetric0.20085.13 5/8926152Straight
#7Number0.2015.1053 5/8926152Straight
13/64 inFraction0.20315.1593 5/8926152Straight
#6Number0.2045.1823 5/8926152Straight
5.20 mmMetric0.20475.23 5/8926152Straight
#5Number0.20555.223 5/8926152Straight
5.30 mmMetric0.20875.33 5/8926152Straight
#4Number0.2095.3093 5/8926152Straight
5.40 mmMetric0.21265.43 5/8926152Straight
#3Number0.2135.413 5/8926152Straight
5.50 mmMetric0.21655.53 5/8926152Straight
7/32 inFraction0.21885.5583 5/8926152Straight
5.60 mmMetric0.22055.63 3/4956 1/8156Straight
#2Number0.2215.6133 3/4956 1/8156Straight
5.70 mmMetric0.22445.73 3/4956 1/8156Straight
#1Number0.2285.7913 3/4956 1/8156Straight
5.80 mmMetric0.22835.83 3/4956 1/8156Straight
5.90 mmMetric0.23235.93 3/4956 1/8156Straight
15/64 inFraction0.23445.9543 3/4956 1/8156Straight
6.00 mmMetric0.236263 3/4956 1/8156Straight
6.10 mmMetric0.24026.13 3/4956 1/8156Straight
6.20 mmMetric0.24416.23 3/4956 1/8156Straight
6.30 mmMetric0.2486.33 3/4956 1/8156Straight
1/4 inFraction0.256.353 3/4956 1/8156Straight
6.40 mmMetric0.2526.43 7/8986 1/4159Straight
6.50 mmMetric0.25596.53 7/8986 1/4159Straight
17/64 inFraction0.26566.7463 7/8986 1/4159Straight
6.80 mmMetric0.26776.83 7/8986 1/4159Straight
7.00 mmMetric0.275673 7/8986 1/4159Straight
9/32 inFraction0.28127.1423 7/8986 1/4159Straight
7.20 mmMetric0.28357.241026 3/8162Straight
7.50 mmMetric0.29537.541026 3/8162Straight
19/64 inFraction0.29697.54141026 3/8162Straight
7.80 mmMetric0.30717.841026 3/8162Straight
5/16 inFraction0.31257.93841026 3/8162Straight
8.00 mmMetric0.31584 1/81056 1/2165Straight
8.20 mmMetric0.32288.24 1/81056 1/2165Straight
21/64 inFraction0.32818.3344 1/81056 1/2165Straight
8.50 mmMetric0.33468.54 1/81056 1/2165Straight
11/32 inFraction0.34388.7334 1/81056 1/2165Straight
8.80 mmMetric0.34658.84 1/41086 3/4171Straight
9.00 mmMetric0.354394 1/41086 3/4171Straight
23/64 inFraction0.35949.1294 1/41086 3/4171Straight
9.20 mmMetric0.36229.24 1/41086 3/4171Straight
9.50 mmMetric0.3749.54 1/41086 3/4171Straight
3/8 inFraction0.3759.5254 1/41086 3/4171Straight
9.80 mmMetric0.38589.84 3/81117178Straight
25/64 inFraction0.39069.9214 3/81117178Straight
10.00 mmMetric0.3937104 3/81117178Straight
10.20 mmMetric0.401610.24 3/81117178Straight
13/32 inFraction0.406210.3174 3/81117178Straight
10.50 mmMetric0.413410.54 5/81177 1/4184Straight
27/64 inFraction0.421910.7164 5/81177 1/4184Straight
10.80 mmMetric0.425210.84 5/81177 1/4184Straight
11.00 mmMetric0.4331114 5/81177 1/4184Straight
7/16 inFraction0.437511.1124 5/81177 1/4184Straight
11.20 mmMetric0.440911.24 3/41217 1/2190Straight
11.50 mmMetric0.452811.54 3/41217 1/2190Straight
29/64 inFraction0.453111.5094 3/41217 1/2190Straight
11.80 mmMetric0.464611.84 3/41217 1/2190Straight
15/32 inFraction0.468811.9084 3/41217 1/2190Straight
12.00 mmMetric0.4724124 3/41217 3/4197Straight
12.20 mmMetric0.480312.24 3/41217 3/4197Straight
31/64 inFraction0.484412.3044 3/41217 3/4197Straight
12.50 mmMetric0.492112.54 3/41217 3/4197Straight
1/2 inFraction0.512.74 3/41217 3/4197Straight
Table 2A 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 1/8292 1/457—2216
#600.041.0161 1/8292 1/457—2216
#590.0411.0411 1/8292 1/457—2216
1.05 mm0.04131.051 1/8292 1/457—2216
#580.0421.0671 1/8292 1/457—2216
#570.0431.0921 1/8292 1/457dec/mmeq mismatch; manual mmeq=1.092 (page image)2216
1.10 mm0.04331.11 1/8292 1/457—2216
1.15 mm0.04531.151 1/8292 1/457—2216
#560.04651.1811 1/8292 1/457—2216
3/64 in0.04691.1911 1/8292 1/457—2216
1.20 mm0.04721.21 3/444376—2216
1.25 mm0.04921.251 3/444376—2216
1.30 mm0.05121.31 3/444376—2216
#550.0521.3211 3/444376—2216
1.35 mm0.05311.351 3/444376—2216
#540.0551.3971 3/444376—2216
1.40 mm0.05511.41 3/444376—2216
1.45 mm0.05711.451 3/444376—2216
1.50 mm0.05911.51 3/444376—2216
#530.05951.5111 3/444376—2216
1.55 mm0.0611.551 3/444376dec<-mmeq2216
1/16 in0.06251.5881 3/444376—2216
1.60 mm0.0631.62513 3/495—2216
#520.06351.6132513 3/495—2216
1.65 mm0.0651.652513 3/495—2216
1.70 mm0.06691.72513 3/495—2216
#510.0671.7022513 3/495—2216
1.75 mm0.06891.752513 3/495—2216
#500.071.7782513 3/495—2216
1.80 mm0.07091.82513 3/495—2216
1.85 mm0.07281.852513 3/495—2317
#490.0731.8542513 3/495—2317
1.90 mm0.07481.92513 3/495—2317
#480.0761.932513 3/495—2317
1.95 mm0.07681.952513 3/495—2317
5/64 in0.07811.9842513 3/495—2317
#470.07851.9942 1/4574 1/4108—2317
2.00 mm0.078722 1/4574 1/4108—2317
2.05 mm0.08072.052 1/4574 1/4108—2317
#460.0812.0572 1/4574 1/4108—2317
#450.0822.0832 1/4574 1/4108—2317
2.10 mm0.08272.12 1/4574 1/4108—2317
2.15 mm0.08462.152 1/4574 1/4108—2317
#440.0862.1842 1/4574 1/4108—2317
2.20 mm0.08662.22 1/4574 1/4108—2317
2.25 mm0.08862.252 1/4574 1/4108—2317
#430.0892.2612 1/4574 1/4108—2317
2.30 mm0.09062.32 1/4574 1/4108—2317
2.35 mm0.09252.352 1/4574 1/4108—2317
#420.09352.3752 1/4574 1/4108—2317
3/32 in0.09382.3832 1/4574 1/4108—2317
2.40 mm0.09452.42 1/2644 5/8117—2317
#410.0962.4382 1/2644 5/8117—2317
2.45 mm0.09652.452 1/2644 5/8117—2317
#400.0982.4892 1/2644 5/8117—2317
2.50 mm0.09842.52 1/2644 5/8117—2317
#390.09952.5272 1/2644 5/8117—2317
#380.10152.5782 1/2644 5/8117—2317
2.60 mm0.10242.62 1/2644 5/8117—2317
#370.1042.6422 1/2644 5/8117—2317
2.70 mm0.10632.72 1/2644 5/8117—2317
#360.10652.7052 1/2644 5/8117—2317
7/64 in0.10942.7792 1/2644 5/8117—2317
#350.112.7942 3/4705 1/8130—2317
2.80 mm0.11022.82 3/4705 1/8130—2317
#340.1112.8192 3/4705 1/8130—2317
#330.1132.872 3/4705 1/8130—2317
2.90 mm0.11422.92 3/4705 1/8130—2317
#320.1162.9462 3/4705 1/8130—2317
3.00 mm0.118132 3/4705 1/8130—2317
#310.123.0482 3/4705 1/8130—2418
3.10 mm0.1223.12 3/4705 1/8130—2418
1/8 in0.1253.1752 3/4705 1/8130—2418
3.20 mm0.1263.23765 3/8137—2418
#300.12853.2643765 3/8137—2418
3.30 mm0.12993.33765 3/8137—2418
3.40 mm0.13393.43765 3/8137—2418
#290.1363.4543765 3/8137—2418
3.50 mm0.13783.53765 3/8137—2418
#280.14053.5693765 3/8137—2418
9/64 in0.14063.5713765 3/8137—2418
3.60 mm0.14173.63765 3/8137—2418
#270.1443.6583765 3/8137—2418
3.70 mm0.14573.73765 3/8137—2418
#260.1473.7343765 3/8137—2418
#250.14953.7973765 3/8137—2418
3.80 mm0.14963.83765 3/8137—2418
#240.1523.8613765 3/8137—2418
3.90 mm0.15353.93765 3/8137—2418
#230.1543.9123765 3/8137—2418
5/32 in0.15623.9673765 3/8137—2418
#220.1573.9883 3/8865 3/4146—2418
4.00 mm0.157543 3/8865 3/4146—2418
#210.1594.0393 3/8865 3/4146—2418
#200.1614.0893 3/8865 3/4146—2418
4.10 mm0.16144.13 3/8865 3/4146—2418
4.20 mm0.16544.23 3/8865 3/4146—2418
#190.1664.2163 3/8865 3/4146—2418
4.30 mm0.16934.33 3/8865 3/4146—2418
#180.16954.3053 3/8865 3/4146—2418
11/64 in0.17194.3663 3/8865 3/4146—2418
#170.1734.3943 3/8865 3/4146—2418
4.40 mm0.17324.43 3/8865 3/4146—2418
#160.1774.4963 3/8865 3/4146—2418
4.50 mm0.17724.53 3/8865 3/4146—2418
#150.184.5723 3/8865 3/4146—2418
4.60 mm0.18114.63 3/8865 3/4146—2418
#140.1824.6233 3/8865 3/4146—2418
#13, 4.70 mm0.1854.73 3/8865 3/4146—2418
3/16 in0.18754.7623 3/8865 3/4146—2418
#12, 4.80 mm0.1894.83 5/8926152—2519
#110.1914.8513 5/8926152—2519
4.90 mm0.19294.93 5/8926152—2519
#100.19354.9153 5/8926152manual Fmm=92.0 (page image); manual Lmm=152.0 (page image)2519
#90.1964.9783 5/8926152manual Fmm=92.0 (page image); manual Lmm=152.0 (page image)2519
5.00 mm0.196953 5/8926152—2519
#80.1995.0553 5/8926152—2519
5.10 mm0.20085.13 5/8926152manual Fmm=92.0 (page image); manual Lmm=152.0 (page image)2519
#70.2015.1053 5/8926152—2519
13/64 in0.20315.1593 5/8926152manual Fmm=92.0 (page image); manual Lmm=152.0 (page image)2519
#60.2045.1823 5/8926152—2519
5.20 mm0.20475.23 5/8926152—2519
#50.20555.223 5/8926152—2519
5.30 mm0.20875.33 5/8926152—2519
#40.2095.3093 5/8926152—2519
5.40 mm0.21265.43 5/8926152—2519
#30.2135.413 5/8926152—2519
5.50 mm0.21655.53 5/8926152—2519
7/32 in0.21885.5583 5/8926152—2519
5.60 mm0.22055.63 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
#20.2215.6133 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
5.70 mm0.22445.73 3/4956 1/8156—2519
#10.2285.7913 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
5.80 mm0.22835.83 3/4956 1/8156—2519
5.90 mm0.23235.93 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
15/64 in0.23445.9543 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
6.00 mm0.236263 3/4956 1/8156F: stray digit removed (OCR 956 -> 95; image shows 95)2519
6.10 mm0.24026.13 3/4956 1/8156—2519
6.20 mm0.24416.23 3/4956 1/8156—2519
6.30 mm0.2486.33 3/4956 1/8156—2519
1/4 in0.256.353 3/4956 1/8156—2519
6.40 mm0.2526.43 7/8986 1/4159—2519
6.50 mm0.25596.53 7/8986 1/4159—2519
17/64 in0.26566.7463 7/8986 1/4159—2519
6.80 mm0.26776.83 7/8986 1/4159—2519
7.00 mm0.275673 7/8986 1/4159—2519
9/32 in0.28127.1423 7/8986 1/4159—2519
7.20 mm0.28357.241026 3/8162—2519
7.50 mm0.29537.541026 3/8162—2519
19/64 in0.29697.54141026 3/8162—2519
7.80 mm0.30717.841026 3/8162—2620
5/16 in0.31257.93841026 3/8162—2620
8.00 mm0.31584 1/81056 1/2165—2620
8.20 mm0.32288.24 1/81056 1/2165—2620
21/64 in0.32818.3344 1/81056 1/2165—2620
8.50 mm0.33468.54 1/81056 1/2165—2620
11/32 in0.34388.7334 1/81056 1/2165—2620
8.80 mm0.34658.84 1/41086 3/4171—2620
9.00 mm0.354394 1/41086 3/4171—2620
23/64 in0.35949.1294 1/41086 3/4171—2620
9.20 mm0.36229.24 1/41086 3/4171—2620
9.50 mm0.3749.54 1/41086 3/4171—2620
3/8 in0.3759.5254 1/41086 3/4171—2620
9.80 mm0.38589.84 3/81117178—2620
25/64 in0.39069.9214 3/81117178manual Fmm=111.0 (page image); manual Lmm=178.0 (page image)2620
10.00 mm0.3937104 3/81117178—2620
10.20 mm0.401610.24 3/81117178—2620
13/32 in0.406210.3174 3/81117178—2620
10.50 mm0.413410.54 5/81177 1/4184—2620
27/64 in0.421910.7164 5/81177 1/4184manual Fmm=117.0 (page image); manual Lmm=184.0 (page image)2620
10.80 mm0.425210.84 5/81177 1/4184—2620
11.00 mm0.4331114 5/81177 1/4184—2620
7/16 in0.437511.1124 5/81177 1/4184—2620
11.20 mm0.440911.24 3/41217 1/2190—2620
11.50 mm0.452811.54 3/41217 1/2190—2620
29/64 in0.453111.5094 3/41217 1/2190—2620
11.80 mm0.464611.84 3/41217 1/2190—2620
15/32 in0.468811.9084 3/41217 1/2190—2620
12.00 mm0.4724124 3/41217 3/4197—2620
12.20 mm0.480312.24 3/41217 3/4197—2620
31/64 in0.484412.3044 3/41217 3/4197—2620
12.50 mm0.492112.54 3/41217 3/4197—2620
1/2 in0.512.74 3/41217 3/4197—2620

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 1.59 mm (1/16 in)L 48 mm (1 7/8 in)D 1.59A 4.76E 3.8One end shown; countersink and bell angles drawn nominally (not dimensioned in Table 9A).

Bell type, size 12, 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.