Drill and tap size chart

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Drill and tap size chart

Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 1 inch. A pdf version is available as a quick reference.

This list is incomplete; you can help by and tap size chart|action=edit expanding it.

Diameter	Diameter	Fractional	Drill wire gauge	Tap size..	Clearance	Clearance	Theoretical percentage of thread.
mm (3 d.p.)	in (5 d.p.)	in			close fit.	free fit	%
0.250	0.00984
0.300	0.01181
0.343	0.01350		80
0.350	0.01378
0.368	0.01449		79
0.397	0.01563	1/64
0.400	0.01575
0.406	0.01600		78
0.420	0.01654
0.440	0.01732
0.450	0.01772
0.457	0.01800		77
0.460	0.01811
0.480	0.01890
0.500	0.01969
0.508	0.02000		76
0.533	0.02100		75
0.550	0.02165
0.572	0.02250		74
0.600	0.02362
0.610	0.02400		73
0.635	0.02500		72
0.650	0.02559
0.660	0.02600		71
0.700	0.02756
0.711	0.02800		70
0.742	0.02920		69
0.750	0.02953
0.787	0.03100		68
0.794	0.03125	1/32
0.800	0.03150
8.128	0.32000		67
0.838	0.03300		66
0.850	0.03346
0.889	0.03500		65
0.900	0.03543
0.914	0.03600		64
0.940	0.03700		63
0.950	0.03740
0.965	0.03800		62
0.991	0.03900		61
1.000	0.03937
10.160	0.40000		60
1.041	0.04100		59
1.050	0.04134
1.067	0.04200		58
1.092	0.04300		57
1.100	0.04331
1.150	0.04528
1.181	0.04650		56
1.191	0.04688	3/64		#0-80	0.06350"	0.07000"
1.200	0.04724
1.250	0.04921
1.300	0.05118
1.321	0.05200		55
1.350	0.05315
1.397	0.05500		54
1.400	0.05512
1.450	0.05709
1.500	0.05906
1.511	0.05950		53	#1-64, #1-72	0.07600"	0.08100"
1.550	0.06102
1.588	0.06250	1/16
1.600	0.06299
1.613	0.06350		52
1.650	0.06496
1.700	0.06693
1.702	0.06700		51	#2-56	0.08900"	0.09600"
1.750	0.06890
1.778	0.07000		50	#2-56, #2-64	0.08900"	0.09600"
1.800	0.07087
1.850	0.07283
1.854	0.07300		49
1.900	0.07480
1.930	0.07600		48
1.950	0.07677
1.984	0.07813	5/64		#3-48	0.10400"	0.11000"	78
1.994	0.07850		47	#3-48	0.10400"	0.11000"	76
2.000	0.07874
2.050	0.08071
2.057	0.08100		46
2.083	0.08200		45	#3-56	0.10400"	0.11000"	74
2.100	0.08268
2.150	0.08465
2.184	0.08600		44	#4-36	0.11600"	0.12850"
2.200	0.08661
2.250	0.08858
2.261	0.08900		43	#4-40	0.11600"	0.12850"	71
2.300	0.09055
2.350	0.09252
2.375	0.09350		42	#4-48	0.11600"	0.12850"	69
2.381	0.09375	3/32
2.400	0.09449
2.438	0.09600		41
2.450	0.09646
2.489	0.09800		40
2.500	0.09843
2.527	0.09950		39	#5-40	0.12850"	0.13600"	78
2.578	0.10150		38	#5-40	0.12850"	0.13600"	72
2.600	0.10236
2.642	0.10400		37	#5-44	0.12850"	0.13600"	71
2.700	0.10630
2.705	0.10650		36	#6-32	0.14400"	0.14950"	77
2.750	0.10827
2.778	0.10938	7/64
2.794	0.11000		35
2.800	0.11024
2.819	0.11100		34
2.870	0.11300		33
2.900	0.11417
2.946	0.11600		32
3.000	0.11811
3.048	0.12000		31
3.100	0.12205
3.175	0.12500	1/8
3.200	0.12598
3.250	0.12795
3.264	0.12850		30
3.300	0.12992
3.400	0.13386
3.454	0.13600		29	#8-32	0.16950"	0.17700"	69
3.500	0.13780
3.569	0.14050		28
3.572	0.14063	9/64
3.600	0.14173
3.658	0.14400		27
3.700	0.14567
3.734	0.14700		26
3.750	0.14764
3.797	0.14950		25	#10-24	0.19600"	0.20100"	75
3.800	0.14961
3.861	0.15200		24
3.900	0.15354
3.912	0.15400		23
3.969	0.15625	5/32
3.988	0.15700		22
4.000	0.15748
4.039	0.15900		21
4.089	0.16100		20
4.100	0.16142
4.200	0.16535
4.216	0.16600		19
4.250	0.16732
4.300	0.16929
4.305	0.16950		18
4.366	0.17188	11/64
4.394	0.17300		17
4.400	0.17323
4.496	0.17700		16	#12-24	0.22100"	0.22800"	72
4.500	0.17717
4.572	0.18000		15
4.600	0.18110
4.623	0.18200		14
4.699	0.18500		13
4.700	0.18504
4.750	0.18701
4.763	0.18750	3/16
4.800	0.18898
4.801	0.18900		12
4.851	0.19100		11
4.900	0.19291
4.915	0.19350		10
4.978	0.19600		9
5.000	0.19685
5.055	0.19900		8
5.100	0.20079
5.105	0.20100		7	1/4-20	0.25700"	0.26600"	72
5.159	0.20313	13/64
5.182	0.20400		6
5.200	0.20472
5.220	0.20550		5
5.250	0.20669
5.300	0.20866
5.309	0.20900		4
5.400	0.21260
5.410	0.21300		3	1/4-28	0.25700"	0.26600"	80
5.500	0.21654
5.556	0.21875	7/32
5.600	0.22047
5.613	0.22100		2
5.700	0.22441
5.750	0.22638
5.791	0.22800		1
5.800	0.22835
5.900	0.23228
5.944	0.23400		A
5.953	0.23438	15/64
6.000	0.23622
6.045	0.23800		B
6.100	0.24016
6.147	0.24200		C
6.200	0.24409
6.248	0.24600		D
6.250	0.24606
6.300	0.24803
6.350	0.25000	1/4	E
6.400	0.25197
6.500	0.25591
6.528	0.25700		F	5/16-18	0.32300"	0.33200"	77
6.600	0.25984
6.629	0.26100		G
6.700	0.26378
6.747	0.26563	17/64
6.750	0.26575
6.756	0.26600		H
6.800	0.26772
6.900	0.27165
6.909	0.27200		I	5/16-24	0.32300"	0.33200"	75
7.000	0.27559
7.036	0.27700		J
7.100	0.27953
7.137	0.28100		K
7.144	0.28125	9/32
7.200	0.28346
7.250	0.28543
7.300	0.28740
7.366	0.29000		L
7.400	0.29134
7.493	0.29500		M
7.500	0.29528
7.541	0.29688	19/64
7.600	0.29921
7.671	0.30200		N
7.700	0.30315
7.750	0.30512
7.800	0.30709
7.900	0.31102
7.938	0.31250	5/16		3/8-16	0.38600"	0.39700"	77
8.000	0.31496
8.026	0.31600		O
8.100	0.31890
8.200	0.32283
8.204	0.32300		P
8.250	0.32480
8.300	0.32677
8.334	0.32813	21/64
8.400	0.33071
8.433	0.33200		Q	3/8-24	0.38600"	0.39700"	79
8.500	0.33465
8.600	0.33858
8.611	0.33900		R
8.700	0.34252
8.731	0.34375	11/32
8.750	0.34449
8.800	0.34646
8.839	0.34800		S
8.900	0.35039
9.000	0.35433
9.093	0.35800		T
9.100	0.35827
9.128	0.35938	23/64
9.200	0.36220
9.250	0.36417
9.300	0.36614
9.347	0.36800		U	7/16-14	0.45310"	0.46870"	75
9.400	0.37008
9.500	0.37402
9.525	0.37500	3/8
9.576	0.37700		V
9.600	0.37795
9.700	0.38189
9.750	0.38386
9.800	0.38583
9.804	0.38600		W
9.900	0.38976
9.922	0.39063	25/64		7/16-20	0.45313"	0.46785"	72
10.000	0.39370
10.084	0.39700		X
10.262	0.40400		Y
10.319	0.40625	13/32
10.490	0.41300		Z
10.500	0.41339
10.716	0.42188	27/64		1/2-13	0.51563"	0.53125"	78
11.000	0.43307
11.113	0.43750	7/16
11.500	0.45276
11.509	0.45313	29/64		1/2-20	0.51563"	0.53125"	72
11.906	0.46875	15/32
12.000	0.47244
12.303	0.48438	31/64
12.500	0.49213
12.700	0.50000	1/2
13.000	0.51181
13.097	0.51563	33/64
13.494	0.53125	17/32
13.500	0.53150
13.891	0.54688	35/64
14.000	0.55118
14.288	0.56250	9/16
14.500	0.57087
14.684	0.57813	37/64
15.000	0.59055
15.081	0.59375	19/32
15.478	0.60938	39/64
15.500	0.61024
15.875	0.62500	5/8
16.000	0.62992
16.272	0.64063	41/64
16.500	0.64961
16.669	0.65625	21/32
17.000	0.66929
17.066	0.67188	43/64
17.463	0.68750	11/16
17.500	0.68898
17.859	0.70313	45/64
18.000	0.70866
18.256	0.71875	23/32
18.500	0.72835
18.653	0.73438	47/64
19.000	0.74803
19.050	0.75000	3/4
19.447	0.76563	49/64
19.500	0.76772
19.844	0.78125	25/32
20.000	0.78740
20.241	0.79688	51/64
20.500	0.80709
20.638	0.81250	13/16
21.000	0.82677
21.034	0.82813	53/64
21.431	0.84375	27/32
21.500	0.84646
21.828	0.85938	55/64
22.000	0.86614
22.225	0.87500	7/8
22.500	0.88583
22.622	0.89063	57/64
23.000	0.90551
23.019	0.90625	29/32
23.416	0.92188	59/64
23.500	0.92520
23.813	0.93750	15/16
24.000	0.94488
24.209	0.95313	61/64
24.500	0.96457
24.606	0.96875	31/32
25.000	0.98425
25.003	0.98438	63/34
25.400	1.00000	1

The file (including a macro to make wikitable) can be found here:Drill and tap size chart v2006-08-03-1730.xls

CATEGORIES (articles) > Tools of the trade > Hand Tools and supplies > Drill and tap size chart

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