Drills

Drills, Drills, Drills

"The only resource that you can change without limit is tools."

Notice that there is more than one drill shown for Tap and Clear. This is because I found conflicting resources on this subject. I use the smallest drill first. If you don't have the smallest listed then the next larger is an "ok" alternative. You can make this hole too big and then there won't be any threads. Clearance drills can be anything larger than those shown but you don't want a lot of "wobble" in most cases.

Decimal (in.)	Fraction (in.)	Metric (mm)	Number	Letter	Tap	Tap Clear
0.0135		0.343	80
0.0145		0.368	79
0.016	close to 1/64 (0.015625)	0.406	78
0.018		0.457	77
0.019		0.483	76
0.02		0.508	76
0.021		0.533	75
0.0225		0.571	74
0.024		0.610	73
0.025		0.635	72
0.026		0.660	71
0.028		0.711	70
0.0292		0.742	69
0.031	close to 1/32 (0.03125), 2/64	0.787	68
0.032		0.813	67
0.033		0.838	66
0.035		0.889	65
0.036		0.914	64
0.037		0.940	63
0.038		0.965	62		00-90
0.039		0.991	61
0.04		1.016	60		00-90
0.041		1.041	59
0.042		1.067	58
0.043		1.092	57
0.0465		1.181	56		0-80	00-90
0.046875	3/64	1.191
0.052	(0.0515)	1.321	55			00-90
0.055		1.397	54
0.0595		1.511	53
0.0595	(0.0585)	1.511	53		1-72
0.0595	(0.0615)	1.511	53
0.0625	1/16, 2/32, 4/64	1.587
0.0635		1.613	52			0-80
0.067		1.702	51			0-80
0.07		1.778	50		2-56
0.073		1.854	49
0.076		1.930	48			1-72
0.0781	5/64	1.984				1-72
0.0785		1.994	47		3-48	1-72
0.081		2.057	46
0.082		2.083	45
0.086		2.184	44
0.089		2.261	43			2-56
0.0935		2.375	42			2-56
0.0938	3/32, 6/64	2.383
0.096		2.438	41
0.098		2.489	40
0.0995		2.527	39
0.1015		2.578	38
0.104		2.642	37
0.1065		2.705	36			5-20,3-48
0.1094	7/64	2.779
0.111		2.819	34
0.113		2.870	33
0.116		2.946	32
0.12		3.048	31
0.125	1/8, 2/16, 4/32, 8/64	3.175
0.1285		3.264	30			7-19
0.136		3.454	29			8-18
0.14	9/64	3.556
0.1405		3.569	28
0.144		3.658	27
0.147		3.734	26
0.1495		3.797	25
0.152		3.861	24
0.154		3.912	23
0.156	5/32, 10/64	3.962
0.157		3.988	22
0.159		4.039	21			10-16
0.161		4.089	20
0.166		4.216	19
0.1695		4.305	18
0.171	11/64	4.343
0.173		4.394	17
0.177		4.496	16
0.18		4.572	15
0.182		4.623	14			12-14
0.185		4.699	13
0.187	3/16, 6/32, 12/64	4.750
0.189		4.801	12
0.191		4.851	11
0.1935		4.915	10
0.196		4.978	9
0.199		5.055	8
0.201		5.105	7
0.203	13/64	5.156
0.204		5.182	6
0.2055		5.220	5
0.209		5.309	4			1/4-14
0.213		5.410	3
0.218	7/32, 14/64	5.537
0.221		5.613	2
0.228		5.791	1
0.234		5.944		A
0.2344	15/64	5.954
0.238		6.045		B
0.242		6.147		C
0.246		6.248		D
0.25	1/4, 2/8,4/16, 8/32, 16/64	6.350		E
0.257		6.528		F
0.261		6.629		G
0.266		6.756		H
0.272		6.909		I		5/16-12
0.277		7.036		J
0.281		7.137		K
0.28125	9/32, 18/64	7.144
0.29		7.366		L
0.295		7.493		M
0.302		7.671		N
0.3125	5/16, 10/32, 20/64	7.937
0.316		8.026		O
0.323		8.204		P
0.332		8.433		Q		3/8-12
0.339		8.611		R
0.348		8.839		S
0.358		9.093		T
0.368		9.347		U
0.375	3/8, 6/16, 12/32, 24/64	9.525
0.377		9.576		V
0.386		9.804				7/16-10
0.386		9.804		W
0.397		10.084		X
0.404		10.262		Y
0.413		10.490		Z
0.4375	7/16,14/32,28/64	11.112
0.4531	"29/64"	11.509				1/2-10
0.5	1/2,2/4,4/8,8/16,16/32,32/64	12.700
0.625	5/8, 10/16,20/32,40/64	15.875
0.75	3/4, 6/8,12/16,24/64	19.050
0.875	7/8, 14/16, 28/32, 56/64	22.225
1	1	25.400
1.125	1.125	28.575
1.25	1.25	31.750

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This page was last updated: 2011-12-03