1 1/16 in Taper length twist drill, over 1/2 in.

D 1.0625 in · 26.988 mm

ASMESTD: ASME B94.11M-1993SOURCE: Table 2B · p. 23DESIGNATION: FRACTIONSHANK: STRAIGHTFLUTES: 2DATA CHECK: OK

Drawing

Side viewSectionPointTang
118°D 26.988 mmF 168 mm (6 5/8 in)B 172 mm (6 25/32 in)N 16S min 98 mm (3 7/8 in)L 286 mm (11 1/4 in)Drawn to scale.

Dimensions

SymbolDimensioninmm
DDiameter1.062526.988
FFlute length6 5/8168
LOverall length11 1/4286
BBody length6 25/32172
SMinimum shank length3 7/898
NMaximum neck length5/816
AShank diameter——
MTMorse taper number—

— : the table gives no value for this drill.

Tolerances (Table 10)

Elementinmm
Point diameter+0.0000 / −0.0015+0.000 / −0.038
Shank diameter+0.0005 / −0.0030+0.013 / −0.076
Back taper per unit flute length0.0004 to 0.00150.010 to 0.038
Flute length F+1/4 / −1/4+6.4 / −6.4
Overall length L+1/4 / −1/4+6.4 / −6.4
Included point angle118° ±3°
Lip height TIV0.00600.152
Centrality of web TIV0.01000.254
Flute spacing TIV0.02600.660
Flute spacing, actual deviation0.01300.330
Max. runout TIR0.007

This diameter in other tables

26.988 mm in every length series that lists it

1 1/16 in · Table 3BScrew machine length twist drill, over 1 in. (reduced shank)F 102 mm · L 159 mm1 1/16 in · Table 5Taper shank twist drill, regularF 168 mm · L 286 mm · MT31 1/16 in · Table 5Taper shank twist drill, larger than regularF 168 mm · L 311 mm · MT41 1/16 in · Table 7Core drill, straight shankF 168 mm · L 286 mm · 4 flutes1 1/16 in · Table 8Core drill, taper shankF 168 mm · L 286 mm · MT3 · 3 flutes1 1/16 in · Table 8Core drill, taper shankF 168 mm · L 286 mm · MT3 · 4 flutes

Data check

Result: OK

ASME B94.11M Table 2B, printed page 23 (scan page 29).

All values for 1 1/16 in (Table 2B)every column of the Designations row
KeyT2B|1 1/16 in|-
Designation1 1/16 in
Designation typeFraction
All designations on printed row1 1/16 in
SeriesT2B
Source tableTable 2B
Drill styleTaper length twist drill, over 1/2 in.
Shank typeStraight
Shank option-
Flutes2 flute
Morse taper no. (A)—
Diameter D (in)1.0625
Diameter equiv. (mm)26.988
Flute length F (in)6 5/8
Flute length F (mm)168
Overall length L (in)11 1/4
Overall length L (mm)286
Body length B (in)6 25/32
Body length B (mm)172
Min shank length S (in)3 7/8
Min shank length S (mm)98
Max neck length N (in)5/8
Max neck length N (mm)16
Shank diameter A (in)—
Shank diameter A (mm)—
Point dia. tol. + (in)0.0000
Point dia. tol. - (in)0.0015
Point dia. tol. + (mm)0.000
Point dia. tol. - (mm)0.038
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)0.0004 to 0.0015
Back taper per unit flute length (mm)0.010 to 0.038
F tol. + (in)1/4
F tol. - (in)1/4
F tol. + (mm)6.4
F tol. - (mm)6.4
L tol. + (in)1/4
L tol. - (in)1/4
L tol. + (mm)6.4
L tol. - (mm)6.4
Included point angle (deg)118
Point angle tol.±3°
Lip height TIV (in)0.0060
Lip height TIV (mm)0.152
Centrality of web TIV (in)0.0100
Centrality of web TIV (mm)0.254
Flute spacing TIV (in)0.0260
Flute spacing TIV (mm)0.660
Flute spacing actual dev. (in)0.0130
Flute spacing actual dev. (mm)0.330
Max runout TIR (in) per Table 100.007
Check: D x 25.4 - printed mm-0.001
Check: F in x 25.4 - F mm0.27
Check: L in x 25.4 - L mm-0.25
Check resultOK
Notes—
PDF page29
Printed page23

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

120 drills, smallest first

DrillTypeD inD mmF inF mmL inL mmShank / flutes
12.80 mmMetric0.503912.84 3/41218203Straight
13.00 mmMetric0.5118134 3/41218203Straight
33/64 inFraction0.515613.0964 3/41218203Straight
13.20 mmMetric0.519713.24 3/41218203Straight
17/32 inFraction0.531213.4924 3/41218203Straight
13.50 mmMetric0.531513.54 3/41218203Straight
13.80 mmMetric0.543313.84 7/81248 1/4210Straight
35/64 inFraction0.546913.8914 7/81248 1/4210Straight
14.00 mmMetric0.5512144 7/81248 1/4210Straight
14.25 mmMetric0.56114.254 7/81248 1/4210Straight
9/16 inFraction0.562514.2884 7/81248 1/4210Straight
14.50 mmMetric0.570914.54 7/81248 3/4222Straight
37/64 inFraction0.578114.6844 7/81248 3/4222Straight
14.75 mmMetric0.580714.754 7/81248 3/4222Straight
15.00 mmMetric0.5906154 7/81248 3/4222Straight
19/32 inFraction0.593815.0834 7/81248 3/4222Straight
15.25 mmMetric0.600415.254 7/81248 3/4222Straight
39/64 inFraction0.609415.4794 7/81248 3/4222Straight
15.50 mmMetric0.610215.54 7/81248 3/4222Straight
15.75 mmMetric0.620115.754 7/81248 3/4222Straight
5/8 inFraction0.62515.8754 7/81248 3/4222Straight
16.00 mmMetric0.6299165 1/81309229Straight
16.25 mmMetric0.639816.255 1/81309229Straight
41/64 inFraction0.640616.2715 1/81309229Straight
16.50 mmMetric0.649616.55 1/81309229Straight
21/32 inFraction0.656216.6675 1/81309229Straight
16.75 mmMetric0.659416.755 3/81379 1/4235Straight
17.00 mmMetric0.6693175 3/81379 1/4235Straight
43/64 inFraction0.671917.0665 3/81379 1/4235Straight
17.25 mmMetric0.679117.255 3/81379 1/4235Straight
11/16 inFraction0.687517.4625 3/81379 1/4235Straight
17.50 mmMetric0.68917.55 5/81439 1/2241Straight
45/64 inFraction0.703117.8595 5/81439 1/2241Straight
18.00 mmMetric0.7087185 5/81439 1/2241Straight
23/32 inFraction0.718818.2585 5/81439 1/2241Straight
18.50 mmMetric0.728318.55 7/81499 3/4248Straight
47/64 inFraction0.734418.6545 7/81499 3/4248Straight
19.00 mmMetric0.748195 7/81499 3/4248Straight
3/4 inFraction0.7519.055 7/81499 3/4248Straight
49/64 inFraction0.765619.44661529 7/8251Straight
19.50 mmMetric0.767719.561529 7/8251Straight
25/32 inFraction0.781219.84261529 7/8251Straight
20.00 mmMetric0.7874206 1/815610254Straight
51/64 inFraction0.796920.2416 1/815610254Straight
20.50 mmMetric0.807120.56 1/815610254Straight
13/16 inFraction0.812520.6386 1/815610254Straight
21.00 mmMetric0.8268216 1/815610254Straight
53/64 inFraction0.828121.0346 1/815610254Straight
27/32 inFraction0.843821.4336 1/815610254Straight
21.50 mmMetric0.846521.56 1/815610254Straight
55/64 inFraction0.859421.8296 1/815610254Straight
22.00 mmMetric0.8661226 1/815610254Straight
7/8 inFraction0.87522.2256 1/815610254Straight
22.50 mmMetric0.885822.56 1/815610254Straight
57/64 inFraction0.890622.6216 1/815610254Straight
23.00 mmMetric0.9055236 1/815610254Straight
29/32 inFraction0.906223.0176 1/815610254Straight
59/64 inFraction0.921923.4166 1/815610 3/4273Straight
23.50 mmMetric0.925223.56 1/815610 3/4273Straight
15/16 inFraction0.937523.8126 1/815610 3/4273Straight
24.00 mmMetric0.9449246 3/816211279Straight
61/64 inFraction0.953124.2096 3/816211279Straight
24.50 mmMetric0.964624.56 3/816211279Straight
31/32 inFraction0.968824.6086 3/816211279Straight
25.00 mmMetric0.9843256 3/816211279Straight
63/64 inFraction0.984425.0046 3/816211279Straight
1 inFraction125.46 3/816211279Straight
25.50 mmMetric1.003925.56 1/216511 1/8283Straight
1 1/64 inFraction1.015625.7966 1/216511 1/8283Straight
26.00 mmMetric1.0236266 1/216511 1/8283Straight
1 1/32 inFraction1.031226.1926 1/216511 1/8283Straight
26.50 mmMetric1.043326.56 5/816811 1/4286Straight
1 3/64 inFraction1.046926.5916 5/816811 1/4286Straight
1 1/16 inFraction1.062526.9886 5/816811 1/4286Straight
27.00 mmMetric1.063276 5/816811 1/4286Straight
1 5/64 inFraction1.078127.3846 7/817511 1/2292Straight
27.50 mmMetric1.082727.56 7/817511 1/2292Straight
1 3/32 inFraction1.093827.7836 7/817511 1/2292Straight
28.00 mmMetric1.1024287 1/818111 3/4298Straight
1 7/64 inFraction1.109428.1797 1/818111 3/4298Straight
28.50 mmMetric1.12228.57 1/818111 3/4298Straight
1 1/8 inFraction1.12528.5757 1/818111 3/4298Straight
1 9/64 inFraction1.140628.9717 1/418411 7/8302Straight
29.00 mmMetric1.1417297 1/418411 7/8302Straight
1 5/32 inFraction1.156229.3677 1/418411 7/8302Straight
29.50 mmMetric1.161429.57 3/818712305Straight
1 11/64 inFraction1.171929.7667 3/818712305Straight
30.00 mmMetric1.1811307 3/818712305Straight
1 3/16 inFraction1.187530.1627 3/818712305Straight
30.50 mmMetric1.200830.57 1/219012 1/8308Straight
1 13/64 inFraction1.203130.5597 1/219012 1/8308Straight
1 7/32 inFraction1.218830.9587 1/219012 1/8308Straight
31.00 mmMetric1.2205317 7/820012 1/2318Straight
1 15/64 inFraction1.234431.3547 7/820012 1/2318Straight
31.50 mmMetric1.240231.57 7/820012 1/2318Straight
1 1/4 inFraction1.2531.757 7/820012 1/2318Straight
32.00 mmMetric1.2598328 1/221614 1/8359Straight
32.50 mmMetric1.279532.58 1/221614 1/8359Straight
1 9/32 inFraction1.281232.5428 1/221614 1/8359Straight
33.00 mmMetric1.2992338 5/821914 1/4362Straight
1 5/16 inFraction1.312533.3388 5/821914 1/4362Straight
33.50 mmMetric1.318933.58 3/422214 3/8365Straight
34.00 mmMetric1.3386348 3/422214 3/8365Straight
1 11/32 inFraction1.343834.1338 3/422214 3/8365Straight
34.50 mmMetric1.358334.58 7/822514 1/2368Straight
1 3/8 inFraction1.37534.9258 7/822514 1/2368Straight
35.00 mmMetric1.37835922914 5/8371Straight
35.50 mmMetric1.397635.5922914 5/8371Straight
1 13/32 inFraction1.406235.717922914 5/8371Straight
36.00 mmMetric1.4173369 1/823214 3/4375Straight
36.50 mmMetric1.43736.59 1/823214 3/4375Straight
1 7/16 inFraction1.437536.5129 1/823214 3/4375Straight
37.00 mmMetric1.4567379 1/423514 7/8378Straight
1 15/32 inFraction1.468837.3089 1/423514 7/8378Straight
37.50 mmMetric1.476437.59 3/823815381Straight
38.00 mmMetric1.4961389 3/823815381Straight
1 1/2 inFraction1.538.19 3/823815381Straight
1 9/16 inFraction1.562539.6889 5/824415 1/4387Straight
1 5/8 inFraction1.62541.2759 7/825115 5/8397Straight
1 3/4 inFraction1.7544.4510 1/226716 1/4413Straight
Table 2B as tabulatedone line per printed row, every column
Designation(s) on printed rowD (in)Equiv. (mm)F (in)F (mm)L (in)L (mm)B (in)B (mm)S (in)S (mm)N (in)N (mm)NotesPDF pagePrinted page
12.80 mm0.503912.84 3/412182034 7/81242 19/32661/213—2721
13.00 mm0.5118134 3/412182034 7/81242 19/32661/213mmeq<-metric label; dec<-mmeq2721
33/64 in0.515613.0964 3/412182034 7/81242 19/32661/213dec<-mmeq2721
13.20 mm0.519713.24 3/412182034 7/81242 19/32661/213dec<-mmeq2721
17/32 in0.531213.4924 3/412182034 7/81242 19/32661/213—2721
13.50 mm0.531513.54 3/412182034 7/81242 19/32661/213—2721
13.80 mm0.543313.84 7/81248 1/421051272 3/4701/213—2721
35/64 in0.546913.8914 7/81248 1/421051272 3/4701/213—2721
14.00 mm0.5512144 7/81248 1/421051272 3/4701/213—2721
14.25 mm0.56114.254 7/81248 1/421051272 3/4701/213—2721
9/16 in0.562514.2884 7/81248 1/421051272 3/4701/213—2721
14.50 mm0.570914.54 7/81248 3/422251273 1/8795/816—2721
37/64 in0.578114.6844 7/81248 3/422251273 1/8795/816—2721
14.75 mm0.580714.754 7/81248 3/422251273 1/8795/816—2721
15.00 mm0.5906154 7/81248 3/422251273 1/8795/816—2721
19/32 in0.593815.0834 7/81248 3/422251273 1/8795/816—2721
15.25 mm0.600415.254 7/81248 3/422251273 1/8795/816—2721
39/64 in0.609415.4794 7/81248 3/422251273 1/8795/816—2721
15.50 mm0.610215.54 7/81248 3/422251273 1/8795/816—2721
15.75 mm0.620115.754 7/81248 3/422251273 1/8795/816—2721
5/8 in0.62515.8754 7/81248 3/422251273 1/8795/816—2721
16.00 mm0.6299165 1/813092295 1/41333 1/8795/816—2721
16.25 mm0.639816.255 1/813092295 1/41333 1/8795/816—2721
41/64 in0.640616.2715 1/813092295 1/41333 1/8795/816—2721
16.50 mm0.649616.55 1/813092295 1/41333 1/8795/816—2721
21/32 in0.656216.6675 1/813092295 1/41333 1/8795/816—2822
16.75 mm0.659416.755 3/81379 1/42355 1/21403 1/8795/816—2822
17.00 mm0.6693175 3/81379 1/42355 1/21403 1/8795/816—2822
43/64 in0.671917.0665 3/81379 1/42355 1/21403 1/8795/816—2822
17.25 mm0.679117.255 3/81379 1/42355 1/21403 1/8795/816—2822
11/16 in0.687517.4625 3/81379 1/42355 1/21403 1/8795/816—2822
17.50 mm0.68917.55 5/81439 1/22415 3/41463 1/8795/816—2822
45/64 in0.703117.8595 5/81439 1/22415 3/41463 1/8795/816—2822
18.00 mm0.7087185 5/81439 1/22415 3/41463 1/8795/816—2822
23/32 in0.718818.2585 5/81439 1/22415 3/41463 1/8795/816—2822
18.50 mm0.728318.55 7/81499 3/424861523 1/8795/816—2822
47/64 in0.734418.6545 7/81499 3/424861523 1/8795/816—2822
19.00 mm0.748195 7/81499 3/424861523 1/8795/816—2822
3/4 in0.7519.055 7/81499 3/424861523 1/8795/816—2822
49/64 in0.765619.44661529 7/82516 1/81563 1/8795/816—2822
19.50 mm0.767719.561529 7/82516 1/81563 1/8795/816—2822
25/32 in0.781219.84261529 7/82516 1/81563 1/8795/816—2822
20.00 mm0.7874206 1/8156102546 1/41593 1/8795/816—2822
51/64 in0.796920.2416 1/8156102546 1/41593 1/8795/816—2822
20.50 mm0.807120.56 1/8156102546 1/41593 1/8795/816—2822
13/16 in0.812520.6386 1/8156102546 1/41593 1/8795/816—2822
21.00 mm0.8268216 1/8156102546 1/41593 1/8795/816mmeq<-metric label2822
53/64 in0.828121.0346 1/8156102546 1/41593 1/8795/816—2822
27/32 in0.843821.4336 1/8156102546 1/41593 1/8795/816—2822
21.50 mm0.846521.56 1/8156102546 1/41593 1/8795/816—2822
55/64 in0.859421.8296 1/8156102546 1/41593 1/8795/816—2822
22.00 mm0.8661226 1/8156102546 1/41593 1/8795/816—2822
7/8 in0.87522.2256 1/8156102546 1/41593 1/8795/816—2822
22.50 mm0.885822.56 1/8156102546 1/41593 1/8795/816—2822
57/64 in0.890622.6216 1/8156102546 1/41593 1/8795/816—2822
23.00 mm0.9055236 1/8156102546 1/41593 1/8795/816—2822
29/32 in0.906223.0176 1/8156102546 1/41593 1/8795/816—2822
59/64 in0.921923.4166 1/815610 3/42736 1/41593 7/8985/816—2822
23.50 mm0.925223.56 1/815610 3/42736 1/41593 7/8985/816—2822
15/16 in0.937523.8126 1/815610 3/42736 1/41593 7/8985/816—2822
24.00 mm0.9449246 3/8162112796 1/21653 7/8985/816—2822
61/64 in0.953124.2096 3/8162112796 1/21653 7/8985/816—2822
24.50 mm0.964624.56 3/8162112796 1/21653 7/8985/816—2822
31/32 in0.968824.6086 3/8162112796 1/21653 7/8985/816—2822
25.00 mm0.9843256 3/8162112796 1/21653 7/8985/816—2822
63/64 in0.984425.0046 3/8162112796 1/21653 7/8985/816—2923
1 in125.46 3/8162112796 1/21653 7/8985/816—2923
25.50 mm1.003925.56 1/216511 1/82836 5/81683 7/8985/816—2923
1 1/64 in1.015625.7966 1/216511 1/82836 5/81683 7/8985/816—2923
26.00 mm1.0236266 1/216511 1/82836 5/81683 7/8985/816—2923
1 1/32 in1.031226.1926 1/216511 1/82836 5/81683 7/8985/816—2923
26.50 mm1.043326.56 5/816811 1/42866 25/321723 7/8985/816dec/mmeq mismatch; manual mmeq=26.5 (page image)2923
1 3/64 in1.046926.5916 5/816811 1/42866 25/321723 7/8985/816—2923
1 1/16 in1.062526.9886 5/816811 1/42866 25/321723 7/8985/816—2923
27.00 mm1.063276 5/816811 1/42866 25/321723 7/8985/816—2923
1 5/64 in1.078127.3846 7/817511 1/229271783 7/8985/816—2923
27.50 mm1.082727.56 7/817511 1/229271783 7/8985/816—2923
1 3/32 in1.093827.7836 7/817511 1/229271783 7/8985/816—2923
28.00 mm1.1024287 1/818111 3/42987 1/41843 7/8985/816—2923
1 7/64 in1.109428.1797 1/818111 3/42987 1/41843 7/8985/816—2923
28.50 mm1.12228.57 1/818111 3/42987 1/41843 7/8985/816—2923
1 1/8 in1.12528.5757 1/818111 3/42987 1/41843 7/8985/816—2923
1 9/64 in1.140628.9717 1/418411 7/83027 3/81873 7/8985/816—2923
29.00 mm1.1417297 1/418411 7/83027 3/81873 7/8985/816dec<-mmeq2923
1 5/32 in1.156229.3677 1/418411 7/83027 3/81873 7/8985/816—2923
29.50 mm1.161429.57 3/8187123057 17/321913 7/8985/816—2923
1 11/64 in1.171929.7667 3/8187123057 17/321913 7/8985/816—2923
30.00 mm1.1811307 3/8187123057 17/321913 7/8985/816—2923
1 3/16 in1.187530.1627 3/8187123057 17/321913 7/8985/816—2923
30.50 mm1.200830.57 1/219012 1/83087 5/81943 7/8985/816dec<-mmeq2923
1 13/64 in1.203130.5597 1/219012 1/83087 5/81943 7/8985/816—2923
1 7/32 in1.218830.9587 1/219012 1/83087 5/81943 7/8985/816—2923
31.00 mm1.2205317 7/820012 1/231882033 7/8985/816—2923
1 15/64 in1.234431.3547 7/820012 1/231882033 7/8985/816—2923
31.50 mm1.240231.57 7/820012 1/231882033 7/8985/816—2923
1 1/4 in1.2531.757 7/820012 1/231882033 7/8985/816—2923
32.00 mm1.2598328 1/221614 1/83598 5/82194 7/81245/816—2923
32.50 mm1.279532.58 1/221614 1/83598 5/82194 7/81245/816—2923
1 9/32 in1.281232.5428 1/221614 1/83598 5/82194 7/81245/816—2923
33.00 mm1.2992338 5/821914 1/43628 3/42224 7/81245/816—2923
1 5/16 in1.312533.3388 5/821914 1/43628 3/42224 7/81245/816—2923
33.50 mm1.318933.58 3/422214 3/83658 7/82254 7/81245/816—2923
34.00 mm1.3386348 3/422214 3/83658 7/82254 7/81245/816—2923
1 11/32 in1.343834.1338 3/422214 3/83658 7/82254 7/81245/816—2923
34.50 mm1.358334.58 7/822514 1/236892294 7/81245/816—2923
1 3/8 in1.37534.9258 7/822514 1/236892294 7/81245/816—3024
35.00 mm1.37835922914 5/83719 1/82324 7/81245/816—3024
35.50 mm1.397635.5922914 5/83719 1/82324 7/81245/816—3024
1 13/32 in1.406235.717922914 5/83719 1/82324 7/81245/816—3024
36.00 mm1.4173369 1/823214 3/43759 1/42354 7/81245/816manual Bmm=235.0 (page image)3024
36.50 mm1.43736.59 1/823214 3/43759 1/42354 7/81245/816—3024
1 7/16 in1.437536.5129 1/823214 3/43759 1/42354 7/81245/816—3024
37.00 mm1.4567379 1/423514 7/83789 3/82384 7/81245/816—3024
1 15/32 in1.468837.3089 1/423514 7/83789 3/82384 7/81245/816manual Bmm=238.0 (page image)3024
37.50 mm1.476437.59 3/8238153819 1/22414 7/81245/816—3024
38.00 mm1.4961389 3/8238153819 1/22414 7/81245/816—3024
1 1/2 in1.538.19 3/8238153819 1/22414 7/81245/816—3024
1 9/16 in1.562539.6889 5/824415 1/43879 23/322474 7/81245/816—3024
1 5/8 in1.62541.2759 7/825115 5/8397102544 7/81243/419—3024
1 3/4 in1.7544.4510 1/226716 1/441310 5/82704 7/81243/419—3024

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 1.19 mm (3/64 in)L 32 mm (1 1/4 in)D 1.19A 3.18One end shown; countersink and bell angles drawn nominally (not dimensioned in Table 9A).

Plain type, size 1, 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.