Drill and tap size chart Information & Drill and tap size chart Links at HealthHaven.com

Below is a comprehensive drill and tap size chart for all drills, imperial and metric, and taps up to 36.5 mm. A pdf version is available as a quick reference.

[edit] Chart

This list is incomplete; you can help by expanding it.

Diameter	Diameter	Fractional	Drill wire gauge^[1]^[2]	Tap size^[3]^[4]^[5]^[6]	Clearance	Clearance	Theoretical percentage^† of thread^[7]^[8]	Outer Diameter
[mm (4 d.p.)]	[in (5 d.p.)]	[in]			[close fit]^[9]	[free fit]^[10]	[%]
0.0483	0.00190		107
0.0500	0.00197
0.0584	0.00230		106
0.0686	0.00270		105
0.0787	0.00310		104
0.0889	0.00350		103
0.0991	0.00390		102
0.1000	0.00394
0.1092	0.00430		101
0.1194	0.00470		100
0.1295	0.00510		99
0.1397	0.00550		98
0.1499	0.00590		97
0.1600	0.00630		96
0.1702	0.00670		95
0.1803	0.00710		94
0.1905	0.00750		93
0.2007	0.00790		92
0.2000	0.00787
0.2108	0.00830		91
0.2210	0.00870		90
0.2311	0.00910		89
0.2413	0.00950		88
0.2500	0.00984
0.2540	0.01000		87
0.2667	0.01050		86
0.2794	0.01100		85
0.2921	0.01150		84
0.3000	0.01181
0.3048	0.01200		83
0.3175	0.01250		82
0.3302	0.01300		81
0.3429	0.01350		80
0.3500	0.01378
0.3680	0.01449		79
0.3969	0.01563	1/64		#0000-160^‡	0.02400"			0.021 in
0.4000	0.01575
0.4064	0.01600		78
0.4200	0.01654
0.4400	0.01732
0.4500	0.01772
0.4572	0.01800		77
0.4600	0.01811
0.4800	0.01890
0.5000	0.01969
0.5080	0.02000		76
0.5334	0.02100		75
0.5500	0.02165
0.5715	0.02250		74
0.6000	0.02362
0.6096	0.02400		73
0.6350	0.02500		72
0.6500	0.02559
0.6604	0.02600		71	#000-120^‡	0.03700"
0.7000	0.02756
0.7112	0.02800		70
0.7417	0.02920		69
0.7500	0.02953
0.7874	0.03100		68
0.7938	0.03125	1/32
0.8000	0.03150
0.8128	0.03200		67
0.8382	0.03300		66
0.8500	0.03346
0.8890	0.03500		65	#00-90^‡	0.05200"
0.9000	0.03543
0.9144	0.03600		64
0.9398	0.03700		63
0.9500	0.03740
0.9652	0.03800		62
0.9906	0.03900		61
1.0000	0.03937
1.0160	0.04000		60
1.0414	0.04100		59
1.0500	0.04134
1.0668	0.04200		58
1.0922	0.04300		57
1.1000	0.04331
1.1500	0.04528
1.1811	0.04650		56
1.1906	0.04688	3/64		#0-80	0.06350"	0.07000"
1.2000	0.04724
1.2500	0.04921
1.3000	0.05118
1.3208	0.05200		55
1.3500	0.05315
1.3970	0.05500		54
1.4000	0.05512
1.4500	0.05709
1.5000	0.05906
1.5113	0.05950		53	#1-64, #1-72	0.07600"	0.08100"
1.5500	0.06102
1.5875	0.06250	1/16
1.6000	0.06299			M2x0.4	0.08661"
1.6129	0.06350		52
1.6500	0.06496
1.7000	0.06693
1.7018	0.06700		51	#2-56	0.08900"	0.09600"
1.7500	0.06890			M2.2x0.45
1.7780	0.07000		50	#2-56, #2-64	0.08900"	0.09600"
1.8000	0.07087
1.8500	0.07283
1.8542	0.07300		49
1.9000	0.07480
1.9304	0.07600		48
1.9500	0.07677
1.9600	0.07717			#3-48	0.10400"	0.11000"	81
1.9700	0.07756			#3-48	0.10400"	0.11000"	79
1.9844	0.07813	5/64		#3-48	0.10400"	0.11000"	78
1.9939	0.07850		47	#3-48	0.10400"	0.11000"	76
2.0000	0.07874			#3-48	0.10400"	0.11000"	75
2.0100	0.07913			#3-48	0.10400"	0.11000"	74
2.0200	0.07953			#3-48	0.10400"	0.11000"	72
2.0300	0.07992			#3-48	0.10400"	0.11000"	71
2.0400	0.08031			#3-48 #3-56	0.10400"	0.11000"	69 81
2.0500	0.08071			#3-48 #3-56 M2.5x0.45	0.10400"	0.11000"	68 79
2.0574	0.08100		46	#3-48 #3-56	0.10400"	0.11000"	66 77
2.0700	0.08150			#3-48 #3-56	0.10400"	0.11000"	65 75
2.0828	0.08200		45	#3-48 #3-56	0.10400"	0.11000"	66 74
2.0900	0.08228			#3-48 #3-56	0.10400"	0.11000"	62 72
2.1000	0.08268			#3-48 #3-56	0.10400"	0.11000"	60 70
2.1100	0.08307			#3-48 #3-56	0.10400"	0.11000"	59 69
2.1200	0.08346			#3-56	0.10400"	0.11000"	67
2.1300	0.08386			#3-56	0.10400"	0.11000"	65
2.1400	0.08425			#3-56	0.10400"	0.11000"	63
2.1500	0.08465			#3-56	0.10400"	0.11000"	62
2.1600	0.08504			#3-56	0.10400"	0.11000"	60
2.1700	0.08543			#3-56	0.10400"	0.11000"	59
2.1844	0.08600		44	#4-36	0.11600"	0.12850"	81
2.1900	0.08622			#4-40	0.11600"	0.12850"	81
2.2000	0.08661			#4-40	0.11600"	0.12850"	78
2.2100	0.08701			#4-40	0.11600"	0.12850"	77
2.2200	0.08740			#4-40	0.11600"	0.12850"	76
2.2300	0.08780			#4-40	0.11600"	0.12850"	75
2.2400	0.08819			#4-40	0.11600"	0.12850"	73
2.2500	0.08858			#4-40	0.11600"	0.12850"	72
2.2600	0.08898			#4-40	0.11600"	0.12850"	71
2.2606	0.08900		43	#4-40	0.11600"	0.12850"	71
2.2700	0.08937			#4-40	0.11600"	0.12850"	70
2.2800	0.08976			#4-40	0.11600"	0.12850"	68
2.2900	0.09016			#4-40 #4-48	0.11600"	0.12850"	67 81
2.3000	0.09055			#4-40 #4-48	0.11600"	0.12850"	66 79
2.3100	0.09094			#4-40 #4-48	0.11600"	0.12850"	65 78
2.3200	0.09134			#4-40 #4-48	0.11600"	0.12850"	64 76
2.3300	0.09			#4-40 #4-48	0.11600"	0.12850"	63 75
2.3400	0.09213			#4-40 #4-48	0.11600"	0.12850"	61 74
2.3500	0.09252			#4-40 #4-48	0.11600"	0.12850"	60 72
2.3749	0.09350		42	#4-48	0.11600"	0.12850"	69
2.3813	0.09375	3/32
2.4000	0.09449
2.4384	0.09600		41
2.4500	0.09646
2.4892	0.09800		40
2.5000	0.09843			M3x0.5			75
2.5273	0.09950		39	#5-40	0.12850"	0.13600"	78
2.5781	0.10150		38	#5-40	0.12850"	0.13600"	72
2.6000	0.10236
2.6416	0.10400		37	#5-44	0.12850"	0.13600"	71
2.7000	0.10630
2.7051	0.10650		36	#6-32	0.14400"	0.14950"	77	.14
2.7500	0.10827
2.7781	0.10938	7/64
2.7940	0.11000		35
2.8000	0.11024
2.8194	0.11100		34
2.8702	0.11300		33	#6-40		.1563		.14
2.9000	0.11417			M3.5x0.6
2.9464	0.11600		32
3.0000	0.11811
3.0480	0.12000		31
3.1000	0.12205
3.1750	0.12500	1/8
3.2000	0.12598
3.2500	0.12795
3.2639	0.12850		30
3.3000	0.12992
3.4000	0.13386
3.4544	0.13600		29	#8-32	0.16950"	0.17700"	69
3.5000	0.13780			M4x0.7			75
3.5687	0.14050		28
3.5719	0.14063	9/64
3.6000	0.14173
3.6576	0.14400		27
3.7000	0.14567
3.7338	0.14700		26
3.7500	0.14764
3.7973	0.14950		25	#10-24	0.19600"	0.20100"	75
3.8000	0.14961
3.8608	0.15200		24
3.9000	0.15354
3.9116	0.15400		23
3.9688	0.15625	5/32
3.9878	0.15700		22
4.0000	0.15748
4.0386	0.15900		21	#10-32	0.1960"	0.2010"
4.0894	0.16100		20
4.1000	0.16142
4.2000	0.16535			M5x0.8			75
4.2164	0.16600		19
4.2500	0.16732
4.3053	0.16950		18
4.3656	0.17188	11/64
4.3942	0.17300		17
4.4000	0.17323
4.4958	0.17700		16	#12-24	0.22100"	0.22800"	72
4.5000	0.17717
4.5720	0.18000		15
4.6000	0.18110
4.6228	0.18200		14
4.6990	0.18500		13
4.7000	0.18504
4.7500	0.18701
4.7625	0.18750	3/16
4.8000	0.18898
4.8006	0.18900		12
4.8514	0.19100		11
4.9000	0.19291
4.9149	0.19350		10
4.9784	0.19600		9
5.0000	0.19685
5.0546	0.19900		8
5.1000	0.20079
5.1054	0.20100		7	1/4-20	0.25700"	0.26600"	72
5.1594	0.20313	13/64
5.1816	0.20400		6
5.2000	0.20472			M6x1.0			75
5.2197	0.20550		5
5.2500	0.20669
5.3000	0.20866
5.3086	0.20900		4
5.4000	0.21260
5.4102	0.21300		3	1/4-28	0.25700"	0.26600"	80
5.5000	0.21654
5.5563	0.21875	7/32
5.6000	0.22047
5.6134	0.22100		2
5.7000	0.22441
5.7500	0.22638
5.7912	0.22800		1
5.8000	0.22835
5.9000	0.23228
5.9436	0.23400		A
5.9531	0.23438	15/64
6.0000	0.23622
6.0452	0.23800		B
6.1000	0.24016			M7x1.0			75
6.1468	0.24200		C
6.2000	0.24409
6.2484	0.24600		D
6.2500	0.24606
6.3000	0.24803
6.3500	0.25000	1/4
6.3500	0.25000		E
6.4000	0.25197
6.5000	0.25591
6.5278	0.25700		F	5/16-18	0.32300"	0.33200"	77
6.6000	0.25984
6.6294	0.26100		G
6.7000	0.26378
6.7469	0.26563	17/64
6.7500	0.26575
6.7564	0.26600		H
6.8000	0.26772
6.9000	0.27165			M8x1.25			75
6.9088	0.27200		I	5/16-24	0.32300"	0.33200"	75
7.0000	0.27559
7.0358	0.27700		J
7.1000	0.27953			M8x1.0			75
7.1374	0.28100		K
7.1438	0.28125	9/32		5/16-32
7.2000	0.28346
7.2500	0.28543
7.3000	0.28740
7.3660	0.29000		L
7.4000	0.29134
7.4930	0.29500		M
7.5000	0.29528
7.5406	0.29688	19/64
7.6000	0.29921
7.6708	0.30200		N
7.7000	0.30315
7.7500	0.30512
7.8000	0.30709
7.9000	0.31102
7.9375	0.31250	5/16		3/8-16	0.38600"	0.39700"	77
8.0000	0.31496
8.0264	0.31600		O
8.1000	0.31890
8.2000	0.32283
8.2042	0.32300		P
8.2500	0.32480
8.3000	0.32677
8.3344	0.32813	21/64
8.4000	0.33071
8.4328	0.33200		Q	3/8-24	0.38600"	0.39700"	79
8.5000	0.33465
8.6000	0.33858
8.6106	0.33900		R
8.7000	0.34252			M10x1.5			75
8.7313	0.34375	11/32
8.7500	0.34449
8.8000	0.34646
8.8392	0.34800		S
8.9000	0.35039			M10x1.25			75
9.0000	0.35433
9.0932	0.35800		T
9.1000	0.35827			M10x1.0 ^{(spark plug)}			75
9.1281	0.35938	23/64
9.2000	0.36220
9.2500	0.36417
9.3000	0.36614
9.3472	0.36800		U	7/16-14	0.45310"	0.46870"	75
9.4000	0.37008
9.5000	0.37402
9.5250	0.37500	3/8
9.5758	0.37700		V
9.6000	0.37795
9.7000	0.38189
9.7500	0.38386
9.8000	0.38583
9.8044	0.38600		W
9.9000	0.38976
9.9219	0.39063	25/64		7/16-20	0.45313"	0.46785"	72
10.0000	0.39370
10.0838	0.39700		X
10.2616	0.40400		Y
10.3188	0.40625	13/32
10.4902	0.41300		Z
10.5000	0.41339			M12x1.75			75
10.7000	0.42126			M12x1.5			75
10.7156	0.42188	27/64		1/2-13	0.51563"	0.53125"	78
10.900	0.42913			M12X1.25 ^{(spark plug)}
11.0000	0.43307
11.1125	0.43750	7/16
11.5000	0.45276
11.5094	0.45313	29/64		1/2-20	0.51563"	0.53125"	72
11.9063	0.46875	15/32		9/16-12	0.56250"		87
12.0000	0.47244
12.2000	0.48031			M14x2			75
12.3031	0.48438	31/64		9/16-12	0.56250"		68
12.5000	0.49213
12.7000	0.50000	1/2		9/16-18	0.56250"		87
12.7000	0.50000			M14x1.5			75
12.8000	0.50393			M14x1.25 ^{(spark plug)}
13.0000	0.51181
13.0969	0.51563	33/64		9/16-18	0.56250"		65
13.4938	0.53125	17/32		5/8-11	0.62500"		79
13.5000	0.53150
13.8906	0.54688	35/64		5/8-11	0.62500"		66
14.0000	0.55118
14.2000	0.55906			M16x2			75
14.2875	0.56250	9/16		5/8-18	0.62500"		87
14.5000	0.57087
14.6844	0.57813	37/64		5/8-18	0.62500"		65
14.7000	0.57874			M16x1.5			75
15.0000	0.59055
15.0813	0.59375	19/32
15.4781	0.60938	39/64
15.5000	0.61024
15.8750	0.62500	5/8
16.0000	0.62992
16.2719	0.64063	41/64		3/4-10			84
16.5000	0.64961
16.6688	0.65625	21/32		3/4-10			72
16.8000	0.66141			M18x1.5 ^{(spark plug)}
17.0000	0.66929
17.0656	0.67188	43/64
17.4625	0.68750	11/16		3/4-16			77
17.5000	0.68898
17.8594	0.70313	45/64
18.0000	0.70866
18.2563	0.71875	23/32
18.5000	0.72835
18.6531	0.73438	47/64
19.0000	0.74803
19.0500	0.75000	3/4
19.4469	0.76563	49/64		7/8-9			76
19.5000	0.76772
19.8438	0.78125	25/32		7/8-9			65
20.0000	0.78740
20.2406	0.79688	51/64		7/8-14			84
20.5000	0.80709
20.6375	0.81250	13/16		7/8-14			67
21.0000	0.82677
21.0344	0.82813	53/64		7/8-18 NS ^{(spark plug)}
21.4313	0.84375	27/32
21.5000	0.84646
21.8281	0.85938	55/64		1-8			87
22.0000	0.86614
22.2250	0.87500	7/8		1-8			77
22.5000	0.88583
22.6219	0.89063	57/64		1-8			67
23.0000	0.90551
23.0188	0.90625	29/32		1-12			87
23.4156	0.92188	59/64		1-12 1-14			72 84
23.5000	0.92520
23.8125	0.93750	15/16		1-14			67
24.0000	0.94488
24.2094	0.95313	61/64
24.5000	0.96457
24.6063	0.96875	31/32		1 1/8-7			84
25.0000	0.98425
25.0031	0.98438	63/64		1 1/8-7			76
25.4000	1.00000	1		1 1/8-7			67
25.5000	1.00394
25.7969	1.01563	1 1/64
26.0000	1.02362
26.1938	1.03125	1 1/32		1 1/8-12			87
26.5000	1.04331
26.5906	1.04688	1 3/64		1 1/8-12			72
26.9875	1.06250	1 1/16
27.0000	1.06299
27.5000	1.08268
28.0000	1.10236
28.1781	1.10938	1 7/64		1 1/4-7			76
28.5000	1.12205
28.5750	1.12500	1 1/8		1 1/4-7			67
29.0000	1.14173
29.3688	1.15625	1 5/32		1 1/4-12			87
29.5000	1.16142
29.7656	1.17188	1 11/64		1 1/4-12			72
30.0000	1.18110
30.1625	1.18750	1 3/16		1 3/8-6			87
30.5000	1.20079
30.5594	1.20313	1 13/64		1 3/8-6			79
30.9563	1.21875	1 7/32		1 3/8-6			72
31.0000	1.22047
31.3531	1.23438	1 15/64		1 3/8-6			65
31.5000	1.24016
32.0000	1.25984
32.5000	1.27953
32.5438	1.28125	1 9/32		1 3/8-12			87
32.9406	1.29688	1 19/64		1 3/8-12			72
33.0000	1.29921
33.3375	1.31250	1 5/16		1 1/2-6			87
33.5000	1.31890
33.7344	1.32813	1 21/64		1 1/2-6			79
34.0000	1.33858
34.1313	1.34375	1 11/32		1 1/2-6			72
34.5000	1.35827
34.5281	1.35938	1 23/64		1 1/2-6			65
35.0000	1.37795
35.5000	1.39764
35.7188	1.40625	1 13/32		1 1/2-12			87
36.0000	1.41732
36.1156	1.42188	1 27/64		1 1/2-12			72
36.5000	1.43701

^†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.

[edit] See also

[edit] References

^ "Continuous Drill Bit Sizes". http://www.madison.k12.wi.us/toki/codrills.htm. Retrieved 2006-08-29.
^ "Decimal Equivalents". Ohio State University. http://www.physics.ohio-state.edu/~kelch/decimal.html. Retrieved 2006-08-29.
^ "Tap Drill Sizes and Calculator". newmantools.com. http://www.newmantools.com/tapdrill.htm. Retrieved 2006-08-04.
^ "Tap Drill Sizes for Universal and M-Profile Screw Threads". precisiontwistdrill.com. http://www.precisiontwistdrill.com/techhelp/help_pages/unified_metric_tap_sizes.asp. Retrieved 2006-08-04.
^ "NC, NF, NEF to one inch in diameter". Sizes.com. http://www.sizes.com/tools/thread_NCNF.htm. Retrieved 2006-09-01.
^ Taps and dies
^ "2007 Tap Catalog (pdf)". guhring.com. http://www.guhring.com/documents/catalogs/taps/2007TapCatalog.pdf. Retrieved 2008-02-04.
^ "Tap Drill Sizes". widell.com. http://www.widell.com/drillsiz.html. Retrieved 2006-09-01.
^ "Tap & Clearance Drills For Common Screws". Small Parts Inc.. http://www.smallparts.com/products/descriptions/Tap%20&%20Clearance%20Drills%20Chart.cfm. Retrieved 2006-09-01.
^ "Tap Drill Sizes". efunda.com. http://www.efunda.com/designstandards/screws/tapdrill.cfm. Retrieved 2006-08-04.

http://www.newmantools.com/taps/micro.htm

[0] "Continuous Drill Bit Sizes". http://www.madison.k12.wi.us/toki/codrills.htm. Retrieved 2006-08-29.

[1] "Decimal Equivalents". Ohio State University. http://www.physics.ohio-state.edu/~kelch/decimal.html. Retrieved 2006-08-29.

[2] "Tap Drill Sizes and Calculator". newmantools.com. http://www.newmantools.com/tapdrill.htm. Retrieved 2006-08-04.

[3] "Tap Drill Sizes for Universal and M-Profile Screw Threads". precisiontwistdrill.com. http://www.precisiontwistdrill.com/techhelp/help_pages/unified_metric_tap_sizes.asp. Retrieved 2006-08-04.

[4] "NC, NF, NEF to one inch in diameter". Sizes.com. http://www.sizes.com/tools/thread_NCNF.htm. Retrieved 2006-09-01.

[5] Taps and dies

[6] "2007 Tap Catalog (pdf)". guhring.com. http://www.guhring.com/documents/catalogs/taps/2007TapCatalog.pdf. Retrieved 2008-02-04.

[7] "Tap Drill Sizes". widell.com. http://www.widell.com/drillsiz.html. Retrieved 2006-09-01.

[smallparts-8] "Tap & Clearance Drills For Common Screws". Small Parts Inc.. http://www.smallparts.com/products/descriptions/Tap%20&%20Clearance%20Drills%20Chart.cfm. Retrieved 2006-09-01.

[efunda-9] "Tap Drill Sizes". efunda.com. http://www.efunda.com/designstandards/screws/tapdrill.cfm. Retrieved 2006-08-04.

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