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Drill Bit Sizing Chart

  Author: Archives
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Standard Numbered Drill Sizes

Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent
80	.0135	60	.040	40	.098	20	.161
79	.0145	59	.041	39	.0995	19	.166
78	.016	58	.042	38	.1015	18	.1695
77	.018	57	.043	37	.104	17	.173
76	.020	56	.0465	36	.1065	16	.177
75	.021	55	.052	35	.110	15	.180
74	.0225	54	.055	34	.111	14	.182
73	.024	53	.0595	33	.113	13	.185
72	.025	52	.0635	32	.116	12	.189
71	.026	51	.067	31	.120	11	.191
70	.028	50	.070	30	.1285	10	.1935
69	.0292	49	.073	29	.136	9	.196
68	.031	48	.076	28	.1405	8	.199
67	.032	47	.0785	27	.144	7	.201
66	.033	46	.081	26	.147	6	.204
65	.035	45	.082	25	.1495	5	.2055
64	.036	44	.086	24	.152	4	.209
63	.037	43	.089	23	.154	3	.213
62	.038	42	.0935	22	.157	2	.221
61	.039	41	.096	21	.159	1	.228

Standard Letter Drill Sizes

Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent
A	.234	H	.266	O	.316	V	.377
B	.238	I	.272	P	.323	W	.386
C	.242	J	.277	Q	.332	X	.397
D	.246	K	.281	R	.339	Y	.404
E	.250	L	.290	S	.348	Z	.413
F	.257	M	.295	T	.358
G	.261	N	.302	U	.368

Standard Fractional Drill Sizes

Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent	Drill Size	Decimal Equivalent
1/64	.0156	17/64	.2656	33/64	.5156	49/64	.7656
1/32	.0313	9/32	.2813	17/32	.5313	25/32	.7813
3/64	.0469	19/64	.2969	35/64	.5469	51/64	.7969
1/16	.0625	5/16	.3125	9/16	.5625	13/16	.8125
5/64	.0781	21/64	.3281	37/64	.5781	53/64	.8281
3/32	.0938	11/32	.3438	19/32	.5938	27/32	.8438
7/64	.1094	23/64	.3594	39/64	.6094	55/64	.8594
1/8	.125	3/8	.375	5/8	.625	7/8	.875
9/64	.1406	25/64	.3906	41/64	.6406	57/64	.8906
5/32	.1563	13/32	.4063	21/32	.6563	29/32	.9063
11/64	.1719	27/64	.4219	43/64	.6719	59/64	.9219
3/16	.1875	7/16	.4375	11/16	.6875	15/16	.9375
13/64	.2031	29/64	.4531	45/64	.7031	61/64	.9531
7/32	.2188	19/32	.5938	23/32	.7188	31/32	.9688
15/64	.2344	31/64	.4844	47/64	.7344	63/64	.9844
1/4	.250	1/2	.500	3/4	.750

American Standard Thread Sizes

Thread Size	Tap Drill (in)	Thread Size	Tap Drill (in)	Thread Size	Tap Drill (in)	Thread Size	Tap Drill (in)
0-80	3/64	5-44	37	1/4-28	3	9/16-18	33/64
1-64	53	6-32	36	5/16-18	F	5/8-11	17/32
1-72	53	6-40	33	5/16-24	I	5/8-18	37/64
2-56	51	8-32	29	3/8-16	5/16	3/4-10	21/32
2-64	50	8-36	29	3/8-24	Q	3/4-16	11/16
3-48	5/64	10-24	25	7/16-14	U	7/8-9	49/64
3-56	46	10-32	21	7/16-20	W	7/8-14	13/16
4-40	43	12-24	17	1/2-13	27/64	1-8	7/8
4-48	42	12-28	15	1/2-20	29/64	1-14	15/16
5-40	39	1/4-20	7	9/16-12	31/64

Metric Course Thread Sizes

Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)
M1x0.25	0.75	M3.5x0.6	2.90	M12x1.75	10.20	M36x4	32.00
M1.1x0.25	0.85	M4x0.7	3.30	M14x2	12.00	M39x4	35.00
M1.2x0.25	0.95	M4.5x0.75	3.70	M16x2	14.00	M42x4.5	37.50
M1.4x0.3	1.10	M5x0.8	4.20	M18x2.5	15.50	M45x4.5	40.50
M1.6x0.35	1.25	M6x1	5.00	M20x2.5	17.50	M48x5	43.00
M1.8x0.35	1.45	M7x1	6.00	M22x2.5	19.50	M52x5	47.00
M2x0.4	1.60	M8x1.25	6.80	M24x3	21.00	M56x5.5	50.50
M2.2x0.45	1.75	M9x1.25	7.80	M27x3	24.00	M60x5.5	54.50
M2.5x0.45	2.05	M10x1.5	8.50	M30x3.5	26.50	M64x6	58.00
M3x0.5	2.50	M11x1.5	9.50	M33x3.5	29.50	M68x6	62.00

Metric Fine Thread Sizes

Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)	Thread Size	Tap Drill (mm)
M4x0.35	3.60	M10x0.75	9.25	M16x1	15.0	M24x1.5	22.5
M4x0.5	3.5	M10x1	9.0	M16x1.5	15.0	M24x2	22.0
M5x0.5	4.5	M10x1.25	8.8	M18x1	17.0	M26x1.5	24.5
M6x.5	5.5	M11x1	10.0	M18x2	16.0	M27x1.5	25.5
M6x.75	5.25	M12x.75	11.25	M20x1	19.0	M27x2	25.0
M7x.75	6.25	M12x1	11.0	M20x1.5	18.5	M28x1.5	26.5
M8x.5	7.0	M12x1.5	10.5	M20x2	18.0	M30x1.5	28.5
M8x.75	7.25	M14x1	13.0	M22x1	21.0	M30x2	28.0
M8x1	7.5	M14x1.25	12.8	M22x1.5	20.5	M33x2	31.0
M9x1	8.0	M14x1.5	12.5	M22x2	20.0	M36x3	36.0

Last update: 07:49 PM Saturday, September 25, 2004

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