1 7/8 in Core drill, taper shank

D 1.875 in · 47.625 mm

ASMESTD: ASME B94.11M-1993SOURCE: Table 8 · p. 53DESIGNATION: FRACTIONSHANK: TAPER (MORSE) MT5FLUTES: 4DATA CHECK: OK

Drawing

Side viewSectionPoint
Morse taper No. 5118°D 47.625 mmF 264 mm (10 3/8 in)L 441 mm (17 3/8 in)Drawn to scale. Taper shank and tang drawn schematically (the drill tables do not give their lengths).

Dimensions

SymbolDimensioninmm
DDiameter1.87547.625
FFlute length10 3/8264
LOverall length17 3/8441
BBody length——
SMinimum shank length——
NMaximum neck length——
AShank diameter——
MTMorse taper number5

— : the table gives no value for this drill.

Tolerances (Table 10)

Elementinmm
Point diameter+0.0000 / −0.0015+0.000 / −0.038
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° ±2°
Lip height TIV0.00600.152
Centrality of web TIV0.01000.254
Flute spacing TIV0.02600.660
Flute spacing, actual deviation0.01300.330
Max. runout TIRn/a

This diameter in other tables

47.625 mm in every length series that lists it

1 7/8 in · Table 3BScrew machine length twist drill, over 1 in. (reduced shank)F 137 mm · L 210 mm1 7/8 in · Table 5Taper shank twist drill, regularF 264 mm · L 441 mm · MT51 7/8 in · Table 5Taper shank twist drill, smaller than regularF 267 mm · L 419 mm · MT4

Data check

Result: OK

ASME B94.11M Table 8, printed page 53 (scan page 59).

All values for 1 7/8 in (Table 8)every column of the Designations row
KeyT8|1 7/8 in|4 flute
Designation1 7/8 in
Designation typeFraction
All designations on printed row1 7/8 in
SeriesT8
Source tableTable 8
Drill styleCore drill, taper shank
Shank typeTaper (Morse)
Shank option-
Flutes4 flute
Morse taper no. (A)5
Diameter D (in)1.875
Diameter equiv. (mm)47.625
Flute length F (in)10 3/8
Flute length F (mm)264
Overall length L (in)17 3/8
Overall length L (mm)441
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)0.0015
Point dia. tol. + (mm)0.000
Point dia. tol. - (mm)0.038
Shank dia. tol. + (in)—
Shank dia. tol. - (in)—
Shank dia. tol. + (mm)—
Shank dia. tol. - (mm)—
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.±2°
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 10n/a
Check: D x 25.4 - printed mm0
Check: F in x 25.4 - F mm-0.48
Check: L in x 25.4 - L mm0.32
Check resultOK
Notes—
PDF page59
Printed page53

Table 8: Core drill, taper shank

86 drills, smallest first

DrillTypeD inD mmF inF mmL inL mmShank / flutes
1/4 inFraction0.256.352 7/8736 1/81563 flutes
9/32 inFraction0.28127.1423766 1/41593 flutes
5/16 inFraction0.31257.9383 1/8796 3/81623 flutes
11/32 inFraction0.34388.7333 1/4836 1/21653 flutes
3/8 inFraction0.3759.5253 1/2896 3/41713 flutes
13/32 inFraction0.406210.2173 5/89271783 flutes
7/16 inFraction0.437511.1123 7/8987 1/41843 flutes
15/32 inFraction0.468811.9084 1/81057 1/21903 flutes
1/2 inFraction0.512.74 3/81118 1/42103 flutes
1/2 inFraction0.512.74 3/81118 1/42104 flutes
17/32 inFraction0.531213.4924 5/81178 1/22163 flutes
17/32 inFraction0.531213.4924 5/81178 1/22164 flutes
9/16 inFraction0.562514.2884 7/81248 3/42223 flutes
9/16 inFraction0.562514.2884 7/81248 3/42224 flutes
19/32 inFraction0.593815.0834 7/81248 3/42223 flutes
19/32 inFraction0.593815.0834 7/81248 3/42224 flutes
5/8 inFraction0.62515.8154 7/81248 3/42223 flutes
5/8 inFraction0.62515.8154 7/81248 3/42224 flutes
21/32 inFraction0.656216.6685 1/813092293 flutes
21/32 inFraction0.656216.6685 1/813092294 flutes
11/16 inFraction0.687517.4625 3/81379 1/42353 flutes
11/16 inFraction0.687517.4625 3/81379 1/42354 flutes
23/32 inFraction0.718818.2585 5/81439 1/22413 flutes
23/32 inFraction0.718818.2585 5/81439 1/22414 flutes
3/4 inFraction0.7519.055 7/81499 3/42483 flutes
3/4 inFraction0.7519.055 7/81499 3/42484 flutes
25/32 inFraction0.781219.84261529 7/82513 flutes
25/32 inFraction0.781219.84261529 7/82514 flutes
13/16 inFraction0.812520.6386 1/815610 3/42733 flutes
13/16 inFraction0.812520.6386 1/815610 3/42734 flutes
27/32 inFraction0.843821.4336 1/815610 3/42733 flutes
27/32 inFraction0.843821.4336 1/815610 3/42734 flutes
7/8 inFraction0.87522.2256 1/815610 3/42733 flutes
7/8 inFraction0.87522.2256 1/815610 3/42734 flutes
29/32 inFraction0.9062236 1/815610 3/42733 flutes
29/32 inFraction0.9062236 1/815610 3/42734 flutes
15/16 inFraction0.937523.8126 1/815610 3/42733 flutes
15/16 inFraction0.937523.8126 1/815610 3/42734 flutes
31/32 inFraction0.968824.6086 3/8162112793 flutes
31/32 inFraction0.968824.6086 3/8162112794 flutes
1 inFraction125.46 3/8162112793 flutes
1 inFraction125.46 3/8162112794 flutes
1 1/32 inFraction1.031226.1926 1/216511 1/82833 flutes
1 1/32 inFraction1.031226.1926 1/216511 1/82834 flutes
1 1/16 inFraction1.062526.9886 5/816811 1/42863 flutes
1 1/16 inFraction1.062526.9886 5/816811 1/42864 flutes
1 3/32 inFraction1.093827.7836 7/817512 1/23183 flutes
1 3/32 inFraction1.093827.7836 7/817512 1/23184 flutes
1 1/8 inFraction1.12528.5757 1/818112 3/43243 flutes
1 1/8 inFraction1.12528.5757 1/818112 3/43244 flutes
1 5/32 inFraction1.156229.3677 1/418412 7/83273 flutes
1 5/32 inFraction1.156229.3677 1/418412 7/83274 flutes
1 3/16 inFraction1.187530.1627 3/8187133303 flutes
1 3/16 inFraction1.187530.1627 3/8187133304 flutes
1 7/32 inFraction1.218830.9587 1/219013 1/83333 flutes
1 7/32 inFraction1.218830.9587 1/219013 1/83334 flutes
1 1/4 inFraction1.2531.757 7/820013 1/23433 flutes
1 1/4 inFraction1.2531.757 7/820013 1/23434 flutes
1 9/32 inFraction1.281232.5428 1/221614 1/83594 flutes
1 5/16 inFraction1.312533.3388 5/821914 1/43624 flutes
1 11/32 inFraction1.343834.1338 3/422214 3/83654 flutes
1 3/8 inFraction1.37534.9258 7/822514 1/23684 flutes
1 13/32 inFraction1.406235.717922914 5/83714 flutes
1 7/16 inFraction1.437536.5129 1/823214 3/43754 flutes
1 15/32 inFraction1.468837.39 1/423514 7/83784 flutes
1 1/2 inFraction1.538.19 3/8238153814 flutes
1 17/32 inFraction1.531238.8929 3/823816 3/84164 flutes
1 9/16 inFraction1.562539.6889 5/824416 5/84224 flutes
1 19/32 inFraction1.593840.4839 7/825116 7/84294 flutes
1 5/8 inFraction1.62541.27510254174324 flutes
1 21/32 inFraction1.656242.06710 1/825717 1/84354 flutes
1 11/16 inFraction1.687542.86210 1/825717 1/84354 flutes
1 23/32 inFraction1.718843.65810 1/825717 1/84354 flutes
1 3/4 inFraction1.7544.4510 1/825717 1/84354 flutes
1 25/32 inFraction1.781245.26210 1/825717 1/84354 flutes
1 13/16 inFraction1.812546.03810 1/825717 1/84354 flutes
1 27/32 inFraction1.843846.83310 1/825717 1/84354 flutes
1 7/8 inFraction1.87547.62510 3/826417 3/84414 flutes
1 29/32 inFraction1.906248.41710 3/826417 3/84414 flutes
1 15/16 inFraction1.937549.21210 3/826417 3/84414 flutes
1 31/32 inFraction1.968850.00810 3/826417 3/84414 flutes
2 inFraction250.810 3/826417 3/84414 flutes
2 1/8 inFraction2.12553.97510 1/426017 3/84414 flutes
2 1/4 inFraction2.2557.1510 1/825717 3/84414 flutes
2 3/8 inFraction2.37560.32510 1/825717 3/84414 flutes
2 1/2 inFraction2.563.511 1/428618 3/44764 flutes
Table 8 as tabulatedone line per printed row, every column
FractionD as printed (in)Equiv. as printed (mm)3-flute A3-flute F (in)3-flute F (mm)3-flute L (in)3-flute L (mm)4-flute A4-flute F (in)4-flute F (mm)4-flute L (in)4-flute L (mm)NotesPDF pagePrinted page
1/4 in0.256.3512 7/8736 1/8156...............—5852
9/32 in0.28127.14213766 1/4159...............—5852
5/16 in0.31757.93813 1/8796 3/8162...............printed decimal 0.3175 differs from 5/16 in = 0.31255852
11/32 in0.34388.73313 1/4836 1/2165...............—5852
3/8 in0.3759.52513 1/2896 3/4171...............—5852
13/32 in0.406210.21713 5/8927178...............printed mm equivalent 10.217 differs from computed 10.3195852
7/16 in0.437511.11213 7/8987 1/4184...............—5852
15/32 in0.468811.90814 1/81057 1/2190...............—5852
1/2 in0.512.724 3/81118 1/421024 3/81118 1/4210—5852
17/32 in0.531213.49224 5/81178 1/221624 5/81178 1/2216—5852
9/16 in0.562514.28824 7/81248 3/422224 7/81248 3/4222—5852
19/32 in0.593815.08324 7/81248 3/422224 7/81248 3/4222—5852
5/8 in0.62515.81524 7/81248 3/422224 7/81248 3/4222printed mm equivalent 15.815 differs from computed 15.8755852
21/32 in0.656216.66825 1/8130922925 1/81309229—5852
11/16 in0.687517.46225 3/81379 1/423525 3/81379 1/4235—5852
23/32 in0.718818.25825 5/81439 1/224125 5/81439 1/2241—5852
3/4 in0.7519.0525 7/81499 3/424825 7/81499 3/4248—5852
25/32 in0.781219.842261529 7/8251261529 7/8251—5852
13/16 in0.812520.63836 1/815610 3/427336 1/815610 3/4273—5852
27/32 in0.843821.43336 1/815610 3/427336 1/815610 3/4273—5852
7/8 in0.87522.22536 1/815610 3/427336 1/815610 3/4273—5852
29/32 in0.90622336 1/815610 3/427336 1/815610 3/4273printed mm equivalent 23.000 differs from computed 23.0195852
15/16 in0.937523.81236 1/815610 3/427336 1/815610 3/4273—5852
31/32 in0.968824.60836 3/81621127936 3/816211279—5852
1 in125.436 3/81621127936 3/816211279—5852
1 1/32 in1.031226.19236 1/216511 1/828336 1/216511 1/8283—5953
1 1/16 in1.062526.98836 5/816811 1/428636 5/816811 1/4286—5953
1 3/32 in1.093827.78346 7/817512 1/231846 7/817512 1/2318—5953
1 1/8 in1.12528.57547 1/818112 3/432447 1/818112 3/4324—5953
1 5/32 in1.156229.36747 1/418412 7/832747 1/418412 7/8327—5953
1 3/16 in1.187530.16247 3/81871333047 3/818713330—5953
1 7/32 in1.218830.95847 1/219013 1/833347 1/219013 1/8333—5953
1 1/4 in1.2531.7547 7/820013 1/234347 7/820013 1/2343—5953
1 9/32 in1.281232.542...............48 1/221614 1/8359—5953
1 5/16 in1.312533.338...............48 5/821914 1/4362—5953
1 11/32 in1.343834.133...............48 3/422214 3/8365—5953
1 3/8 in1.37534.925...............48 7/822514 1/2368—5953
1 13/32 in1.406235.717...............4922914 5/8371—5953
1 7/16 in1.437536.512...............49 1/823214 3/4375—5953
1 15/32 in1.468337.3...............49 1/423514 7/8378printed decimal 1.4683 differs from 1 15/32 in = 1.4688; printed mm equivalent 37.300 differs from computed 37.3065953
1 1/2 in1.538.1...............49 3/823815381—5953
1 17/32 in1.531238.892...............59 3/823816 3/8416—5953
1 9/16 in1.567539.688...............59 5/824416 5/8422printed decimal 1.5675 differs from 1 9/16 in = 1.56255953
1 19/32 in1.593840.483...............59 7/825116 7/8429—5953
1 5/8 in1.62541.275...............51025417432—5953
1 21/32 in1.656242.067...............510 1/825717 1/8435—5953
1 11/16 in1.687542.862...............510 1/825717 1/8435—5953
1 23/32 in1.843843.658...............510 1/825717 1/8435printed decimal 1.8438 differs from 1 23/32 in = 1.7188; printed mm equivalent 43.658 differs from computed 43.6565953
1 3/4 in1.7544.45...............510 1/825717 1/8435—5953
1 25/32 in1.781245.262...............510 1/825717 1/8435printed mm equivalent 45.262 differs from computed 45.2445953
1 13/16 in1.812546.038...............510 1/825717 1/8435—5953
1 27/32 in146.833...............510 1/825717 1/8435printed decimal 1.0000 differs from 1 27/32 in = 1.8438; printed mm equivalent 46.833 differs from computed 46.8315953
1 7/8 in1.87547.625...............510 3/826417 3/8441—5953
1 29/32 in1.906248.417...............510 3/826417 3/8441—5953
1 15/16 in1.937549.212...............510 3/826417 3/8441—5953
1 31/32 in1.968850.008...............510 3/826417 3/8441—5953
2 in250.8...............510 3/826417 3/8441—5953
2 1/8 in2.12553.975...............510 1/426017 3/8441—5953
2 1/4 in2.2557.15...............510 1/825717 3/8441—5953
2 3/8 in2.37560.325...............510 1/825717 3/8441—5953
2 1/2 in2.563.5...............511 1/428618 3/4476—5953

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 0.97 mm (.038 in)L 29 mm (1 1/8 in)D 0.79A 2.38One end shown; countersink and bell angles drawn nominally (not dimensioned in Table 9A).

Plain type, size 0, 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.