List of drill and tap sizes

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Below is a comprehensive drill and tap size chart for all drills and taps, imperial and metric, up to 36.5 millimetres (1.44 in).

In manufactured parts, holes with female screw threads are often needed; they accept male screws to facilitate the building and fastening of a finished assembly. One of the most common ways to produce such threaded holes is to drill a hole of appropriate size with a drill bit and then tap it with a tap. Each standard size of female screw thread has one or several corresponding drill bit sizes that are within the range of appropriate size—slightly larger than the minor diameter of the mating male thread, but smaller than its pitch and major diameters. Such an appropriately sized drill is called a tap drill for that size of thread, because it is a correct drill to be followed by the tap. Many thread sizes have several possible tap drills, because they yield threads of varying thread depth between 50% and 100%. Usually thread depths of 60% to 75% are desired.

People frequently use a chart such as this to determine the proper tap drill for a certain thread size or the proper tap for an existing hole.

Rules of thumb[edit]

Regarding the proportion of tap drill to thread major diameter, for standard V threads (ISO V thread and UTS V thread), there are several rules of thumb with strong predictive power:

Below, these guidelines are explored with examples.

Examples[edit]

Chart[edit]

Drill bit diameterDrill bit diameterFractional size (inches)Drill wire
 gauge[1][2]
Tap size[3][4][5]ClearanceClearanceTheoretical percentage of thread[6][7]Outer Diameter
[mm (4 d.p.)][in (5 d.p.)][in][close fit][8][free fit][9][%]
0.04830.00190107
0.05000.00197
0.05840.00230106
0.06860.00270105
0.07870.00310104
0.08890.00350103
0.09910.00390102
0.10000.00394
0.10920.00430101
0.11940.00470100
0.12950.0051099
0.13970.0055098
0.14990.0059097
0.16000.0063096
0.17020.0067095
0.18030.0071094
0.19050.0075093
0.20070.0079092
0.20000.00787
0.21080.0083091
0.22100.0087090
0.23110.0091089
0.24130.0095088
0.25000.00984
0.25400.0100087
0.26670.0105086
0.27940.0110085
0.29210.0115084
0.30000.01181
0.30480.0120083
0.31750.0125082
0.33020.0130081
0.34290.0135080
0.35000.01378
0.36800.0144979
0.39690.015631/64#0000-1600.02400"0.021 in
0.40000.01575
0.40640.0160078
0.42000.01654
0.44000.01732
0.45000.01772
0.45720.0180077
0.46000.01811
0.48000.01890
0.50000.01969
0.50800.0200076
0.53340.0210075
0.55000.02165
0.57150.0225074
0.60000.02362
0.60960.0240073
0.63500.0250072
0.65000.02559
0.66040.0260071#000-1200.03700"
0.70000.02756
0.71120.0280070
0.74170.0292069
0.75000.02953
0.78740.0310068
0.79380.031251/32
0.80000.03150
0.81280.0320067
0.83820.0330066
0.85000.03346
0.88900.0350065#00-900.05200"
0.90000.03543
0.91440.0360064
0.93980.0370063
0.95000.03740
0.96520.0380062
0.99060.0390061
1.00000.03937
1.01600.0400060
1.04140.0410059
1.05000.04134
1.06680.0420058
1.09220.0430057
1.10000.04331
1.15000.04528
1.18110.0465056
1.19060.046883/64#0-800.06350"0.07000"
1.20000.04724
1.25000.04921
1.30000.05118
1.32080.0520055
1.35000.05315
1.39700.0550054
1.40000.05512
1.45000.05709
1.50000.05906
1.51130.0595053#1-64, #1-720.07600"0.08100"
1.55000.06102
1.58750.062501/16
1.60000.06299M2x0.42.2mm
1.61290.0635052
1.65000.06496
1.70000.06693
1.70180.0670051#2-560.08900"0.09600"
1.75000.06890M2.2x0.452.25mm
1.77800.0700050#2-56, #2-640.08900"0.09600"
1.80000.07087
1.85000.07283
1.85420.0730049
1.90000.07480
1.93040.0760048
1.95000.07677
1.96000.07717#3-480.10400"0.11000"81
1.97000.07756#3-480.10400"0.11000"79
1.98440.078135/64#3-480.10400"0.11000"78
1.99390.0785047#3-480.10400"0.11000"76
2.00000.07874#3-480.10400"0.11000"75
2.01000.07913#3-480.10400"0.11000"74
2.02000.07953#3-480.10400"0.11000"72
2.03000.07992#3-480.10400"0.11000"71
2.04000.08031#3-48
#3-56
0.10400"0.11000"69
81
2.05000.08071#3-48
#3-56
M2.5x0.45
0.10400"
 
0.11000"
 
68
79
 
2.05740.0810046#3-48
#3-56
0.10400"0.11000"66
77
2.07000.08150#3-48
#3-56
0.10400"0.11000"65
75
2.08280.0820045#3-48
#3-56
0.10400"0.11000"66
74
2.09000.08228#3-48
#3-56
0.10400"0.11000"62
72
2.10000.08268#3-48
#3-56
M2.5x0.35
0.10400"0.11000"60
70
2.11000.08307#3-48
#3-56
0.10400"0.11000"59
69
2.12000.08346#3-560.10400"0.11000"67
2.13000.08386#3-560.10400"0.11000"65
2.14000.08425#3-560.10400"0.11000"63
2.15000.08465#3-560.10400"0.11000"62
2.16000.08504#3-560.10400"0.11000"60
2.17000.08543#3-560.10400"0.11000"59
2.18440.0860044#4-360.11600"0.12850"81
2.19000.08622#4-400.11600"0.12850"81
2.20000.08661#4-400.11600"0.12850"78
2.21000.08701#4-400.11600"0.12850"77
2.22000.08740#4-400.11600"0.12850"76
2.23000.08780#4-400.11600"0.12850"75
2.24000.08819#4-400.11600"0.12850"73
2.25000.08858#4-400.11600"0.12850"72
2.26000.08898#4-400.11600"0.12850"71
2.26060.0890043#4-400.11600"0.12850"71
2.27000.08937#4-400.11600"0.12850"70
2.28000.08976#4-400.11600"0.12850"68
2.29000.09016#4-40
#4-48
0.11600"0.12850"67
81
2.30000.09055#4-40
#4-48
0.11600"0.12850"66
79
2.31000.09094#4-40
#4-48
0.11600"0.12850"65
78
2.32000.09134#4-40
#4-48
0.11600"0.12850"64
76
2.33000.09173#4-40
#4-48
0.11600"0.12850"63
75
2.34000.09213#4-40
#4-48
0.11600"0.12850"61
74
2.35000.09252#4-40
#4-48
0.11600"0.12850"60
72
2.37490.0935042#4-480.11600"0.12850"69
2.38130.093753/32
2.40000.09449
2.43840.0960041
2.45000.09646
2.48920.0980040
2.50000.09843M3x0.53.2mm75
2.52730.0995039#5-400.12850"0.13600"78
2.57810.1015038#5-400.12850"0.13600"72
2.60000.10236
2.64160.1040037#5-440.12850"0.13600"71
2.70000.10630
2.70510.1065036#6-320.14400"0.14950"77.14
2.75000.10827
2.77810.109387/64
2.79400.1100035
2.80000.11024
2.81940.1110034
2.87020.1130033#6-40.1563.14
2.90000.11417M3.5x0.6
2.94640.1160032
3.00000.11811
3.04800.1200031
3.10000.12205
3.17500.125001/8
3.20000.12598
3.25000.12795
3.26390.1285030
3.30000.12992M4x0.74.10mm75
3.40000.13386
3.45440.1360029#8-320.16950"0.17700"69
3.50000.13780M4x0.74.10mm60
3.56870.1405028
3.57190.140639/64
3.60000.14173
3.65760.1440027
3.70000.14567
3.73380.1470026
3.75000.14764
3.79730.1495025#10-240.19600"0.20100"75
3.80000.14961
3.86080.1520024
3.90000.15354
3.91160.1540023
3.96880.156255/32
3.98780.1570022
4.00000.15748
4.03860.1590021#10-320.1960"0.2010"
4.08940.1610020
4.10000.16142
4.20000.16535M5x0.85.10mm75
4.21640.1660019
4.25000.16732
4.30530.1695018
4.36560.1718811/64
4.39420.1730017
4.40000.17323
4.49580.1770016#12-240.22100"0.22800"72
4.50000.17717
4.57200.1800015
4.60000.18110
4.62280.1820014
4.69900.1850013
4.70000.18504
4.75000.18701
4.76250.187503/16
4.80000.18898
4.80060.1890012
4.85140.1910011
4.90000.19291
4.91490.1935010
4.97840.196009
5.00000.19685M6x1.06.10mm75
5.05460.199008
5.10000.20079
5.10540.2010071/4-200.25700"0.26600"72
5.15940.2031313/64
5.18160.204006
5.20000.20472M6x1.06.10mm60
5.21970.205505
5.25000.20669
5.30000.20866
5.30860.209004
5.40000.21260
5.41020.2130031/4-280.25700"0.26600"80
5.50000.216541/4-280.25700"0.26600"70
5.55630.218757/321/4-280.25700"0.26600"68
5.60000.220471/4-280.25700"0.26600"63
5.61340.2210021/4-280.25700"0.26600"60
5.70000.22441
5.75000.22638
5.79120.228001
5.80000.22835
5.90000.23228
5.94360.23400A
5.95310.2343815/64
6.00000.23622
6.04520.23800B
6.10000.24016M7x1.075
6.14680.24200C
6.20000.24409
6.24840.24600D
6.25000.24606
6.30000.24803
6.35000.250001/4
E
6.40000.25197
6.50000.25591M7X0.5
6.52780.25700F5/16-180.32300"0.33200"77
6.60000.25984
6.62940.26100G
6.70000.26378
6.74690.2656317/64
6.75000.26575
6.75640.26600H
6.80000.26772
6.90000.27165M8x1.2575
6.90880.27200I5/16-240.32300"0.33200"75
7.00000.27559
7.03580.27700J
7.10000.27953M8x1.075
7.13740.28100K
7.14380.281259/325/16-32
7.20000.28346
7.25000.28543
7.30000.28740
7.36600.29000L
7.40000.29134
7.49300.29500M
7.50000.29528
7.54060.2968819/64
7.60000.29921
7.67080.30200N
7.70000.30315
7.75000.30512
7.80000.30709
7.90000.31102
7.93750.312505/163/8-160.38600"0.39700"77
8.00000.31496
8.02640.31600O
8.10000.31890
8.20000.32283
8.20420.32300P
8.25000.32480
8.30000.32677
8.33440.3281321/64
8.40000.33071
8.43280.33200Q3/8-240.38600"0.39700"79
8.50000.33465
8.60000.33858
8.61060.33900R
8.70000.34252M10x1.575
8.73130.3437511/32
8.75000.34449
8.80000.34646
8.83920.34800S
8.90000.35039M10x1.2575
9.00000.35433
9.09320.35800T
9.10000.35827M10x1.0
(spark plug)
75
9.12810.3593823/64
9.20000.36220
9.25000.36417
9.30000.36614
9.34720.36800U7/16-140.45310"0.46870"75
9.40000.37008
9.50000.37402
9.52500.375003/8
9.57580.37700V
9.60000.37795
9.70000.38189
9.75000.38386
9.80000.38583
9.80440.38600W
9.90000.38976
9.92190.3906325/647/16-200.45313"0.46785"72
10.00000.39370
10.08380.39700X
10.26160.40400Y
10.31880.4062513/327/16 - 40
10.49020.41300Z
10.50000.41339M12x1.7575
10.70000.42126M12x1.575
10.71560.4218827/641/2-130.51563"0.53125"78
10.9000.42913M12X1.25
(spark plug)
11.00000.43307
11.11250.437507/16
11.50000.45276
11.50940.4531329/641/2-200.51563"0.53125"72
11.90630.4687515/329/16-120.56250"87
12.00000.47244
12.20000.48031M14x275
12.30310.4843831/649/16-120.56250"68
12.50000.49213
12.70000.500001/29/16-180.56250"87
M14x1.575
12.80000.50393M14x1.25
(spark plug)
13.00000.51181
13.09690.5156333/649/16-180.56250"65
13.49380.5312517/325/8-110.62500"79
13.50000.53150
13.89060.5468835/645/8-110.62500"66
14.00000.55118
14.20000.55906M16x275
14.28750.562509/165/8-180.62500"87
14.50000.57087
14.68440.5781337/645/8-180.62500"65
14.70000.57874M16x1.575
15.00000.59055
15.08130.5937519/32
15.47810.6093839/64
15.50000.61024
15.87500.625005/8
16.00000.62992
16.27190.6406341/643/4-1084
16.50000.64961
16.66880.6562521/323/4-1072
16.80000.66141M18x1.5
(spark plug)
17.00000.66929
17.06560.6718843/64
17.46250.6875011/163/4-1677
17.50000.68898
17.85940.7031345/64
18.00000.70866
18.25630.7187523/32
18.50000.72835
18.65310.7343847/64
19.00000.74803
19.05000.750003/4
19.44690.7656349/647/8-976
19.50000.76772
19.84380.7812525/327/8-965
20.00000.78740
20.24060.7968851/647/8-1484
20.50000.80709
20.63750.8125013/167/8-1467
21.00000.82677
21.03440.8281353/647/8-18 NS
(spark plug)
21.43130.8437527/32
21.50000.84646
21.82810.8593855/641-887
22.00000.86614
22.22500.875007/81-877
22.50000.88583
22.62190.8906357/641-867
23.00000.90551
23.01880.9062529/321-1287
23.41560.9218859/641-12
1-14
72
84
23.50000.92520
23.81250.9375015/161-1467
24.00000.94488
24.20940.9531361/64
24.50000.96457
24.60630.9687531/321 1/8-784
25.00000.98425
25.00310.9843863/641 1/8-776
25.40001.0000011 1/8-767
25.50001.00394
25.79691.015631 1/64
26.00001.02362
26.19381.031251 1/321 1/8-1287
26.50001.04331
26.59061.046881 3/641 1/8-1272
26.98751.062501 1/16
27.00001.06299
27.50001.08268
28.00001.10236
28.17811.109381 7/641 1/4-776
28.50001.12205
28.57501.125001 1/81 1/4-767
29.00001.14173
29.36881.156251 5/321 1/4-1287
29.50001.16142
29.76561.171881 11/641 1/4-1272
30.00001.18110
30.16251.187501 3/161 3/8-687
30.50001.20079
30.55941.203131 13/641 3/8-679
30.95631.218751 7/321 3/8-672
31.00001.22047
31.35311.234381 15/641 3/8-665
31.50001.24016
32.00001.25984
32.50001.27953
32.54381.281251 9/321 3/8-1287
32.94061.296881 19/641 3/8-1272
33.00001.29921
33.33751.312501 5/161 1/2-687
33.50001.31890
33.73441.328131 21/641 1/2-679
34.00001.33858
34.13131.343751 11/321 1/2-672
34.50001.35827
34.52811.359381 23/641 1/2-665
35.00001.37795
35.50001.39764
35.71881.406251 13/321 1/2-1287
36.00001.41732
36.11561.421881 27/641 1/2-1272
36.50001.43701

If theoretical thread percentage not given, assume 75% ± 10%
  Theoretical percentage of thread should not be relied upon for threads of included angles other than 60 degrees.
See http://www.newmantools.com/taps/micro.htm for more information.

See also[edit]

References[edit]

  1. ^ "Continuous Drill Bit Sizes". Archived from the original on 2006-07-19. Retrieved 2006-08-29. 
  2. ^ "Decimal Equivalents". Ohio State University. Archived from the original on 2006-09-02. Retrieved 2006-08-29. 
  3. ^ "Tap Drill Sizes and Calculator". newmantools.com. Retrieved 2006-08-04. 
  4. ^ "Tap Drill Sizes for Universal and M-Profile Screw Threads". precisiontwistdrill.com. Retrieved 2006-08-04. 
  5. ^ "NC, NF, NEF to one inch in diameter". Sizes.com. Retrieved 2006-09-01. 
  6. ^ "High performance taps". guhring.com. Retrieved 2010-10-07. 
  7. ^ "Tap Drill Sizes". widell.com. Retrieved 2006-09-01. 
  8. ^ "Tap & Clearance Drills For Common Screws". Small Parts Inc. Archived from the original on 2007-10-08. Retrieved 2010-10-07. 
  9. ^ "Tap Drill Sizes". efunda.com. Retrieved 2006-08-04. 

External links[edit]