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Drill Bits Sizes and Taps

This page contains information regarding drill bit sizes in standard and the metric equivalent as well as the drill bit sizes required for tap sizes.

Tap Terminology

Drill sizes; numbers,
letters, and fractions

Taps and Tap Drill Sizes

Number & Letter Drills	Fractional Drills	Decimal Equivalents
80	...	.0135
79	...	.0145
	1/64	.0156
78	...	.0160
77	...	.0180
76	...	.0200
75	...	.0210
74	...	.0225
73	...	.0240
72	...	.0250
71	...	.0260
70	...	.0280
69	...	.0292
68	...	.0310
	1/32	.0312
67	...	.0320
66	...	.0330
65	...	.0350
64	...	.0360
63	...	.0370
62	...	.0380
61	...	.0390
60	...	.0400
59	...	.0410
58	...	.0420
57	...	.0430
56	...	.0465
	3/64	.0469
55	...	.0520
54	...	.0550
53	...	.0595
	1/16	.0625
52	...	.0635
51	...	.0670
50	...	.0700
49	...	.0730
48	...	.0760
	5/64	.0781
47	...	.0785
46	...	.0810
45	...	.0820
44	...	.0860
43	...	.0890
42	...	.0935
	3/32	.0937
41	...	.0960
40	...	.0980
39	...	.0995
38	...	.1015
37	...	.1040
36	...	.1065
	7/64	.1094
35	...	.1100
34	...	.1110
33	...	.1130
32	...	.1160
31	...	.1200
	1/8	.1250
30	...	.1285
29	...	.1360
28	...	.1405
	9/64	.1406
27	...	.1440
26	...	.1470
25	...	.1495
24	...	.1520
23	...	.1540
	5/32	.1562
22	...	.1570
21	...	.1590
20	...	.1610
19	...	.1660
18	...	.1695
	11/64	.1719
17	...	.1720
16	...	.1770
15	...	.1800
14	...	.1820
13	...	.1850
	3/16	.1875
12	...	.1890
11	...	.1910
10	...	.1935
9	...	.1960
8	...	.1990
7	...	.2010
	13/64	.2031
6	...	.2040
5	...	.2055
4	...	.2090
3	...	.2130
	7/32	.2187
2	...	.2210
1	...	.2280
A	...	.2340
	15/64	.2344
B	...	.2380
C	...	.2420
D	...	.2460
E	1/4	.2500
F	...	.2570
G	...	.2610
	17/64	.2656
H	...	.2660
I	...	.2720
J	...	.2770
K	...	.2810
	9/32	.2812
L	...	.2900
M	...	.2950
	19/64	.2969
N	...	.3020
	5/16	.3125
O	...	.3160
P	...	.3230
	21/64	.3281
Q	...	.3320
R	...	.3390
	11/32	.3437
S	...	.3480
T	...	.3580
	23/64	.3594
U	...	.3680
	3/8	.3750
V	...	.3770
W	...	.3860
	25/64	.3906
X	...	.3970
Y	...	.4040
	13/32	.4062
Z	...	.4130
	27/64	.4219
	7/16	.4375
	29/64	.4531
	15/32	.4687
	31/64	.4844
	1/2	.5000
	33/64	.5156
	17/32	.5312
	35/64	.5469
	9/16	.5625
	37/64	.5781
	19/32	.5937
	39/64	.6094
	5/8	.6250
	41/64	.6406
	21/32	.6562
	43/64	.6719
	11/16	.6875
	45/64	.7031
	23/32	.7187
	47/64	.7344
	3/4	.7500
	49/64	.7656
	25/32	.7812
	51/64	.7969
	13/16	.8125
	53/64	.8281
	27/32	.8437
	55/64	.8594
	7/8	.8750
	57/64	.8906
	29/32	.9062
	59/64	.9219
	15/16	.9375
	61/64	.9531
	31/32	.9687
	63/64	.9844
	1	1.0000

Tap Size	Decimal	Drill
0-80	.0469	3/64
1-56	.0550	54
1-64, 72	.0590	53
2-56, 64	.0700	50
3-48	.0785	47
3-56, 4-32	.0820	45
4-38	.0860	44
4-40	.0890	43
4-48	.0935	42
5-40	.1015	38
5-44	.1040	37
6-32	.1065	36
6-36	.1110	34
6-40	.1130	33
8-32, 36	.1360	29
8-40	.1405	28
10-24	.1495	25
12-24	.1770	16
12-28	.1820	14
12-32	.1850	13
1/4-20	.2010	7
1/4-28	.2130	3
5/16-18	.2570	F
5/16-24	.2720	I
3/8-16	.3125	5/16
3/8-24	.3320	Q
7/16-14	.3680	U
7/16-20	.3906	25/64
1/2-13	.4219	27/64
1/2-20	.4531	29/64
9/16-12	.4844	31/64
9/16-18	.5156	33/64
5/8-11	5312	17/32
5/8-18	.5781	37/64
11/16-11	.6094	39/64
11/16-16	.6250	5/8
3/4-10	.6562	21/32
3/4-16	.6875	11/16
7/8-9	.7656	49/64
7/8-14	.8125	13/16
1-8	.8750	7/8
1-12	.9219	59/64
1-14	.9375	15/16

This table covers threads per inch and clearance tolerances up to 1/2 inch.

					Clearance Hole Drills
Size of Screw			Tap Drill		Close Fit		Free Fit
No. or Dia.	Decimal (inch)	Threads Per Inch	Drill Size	Decimal (inch)	Drill Size	Decimal (inch)	Drill Size	Decimal (inch)
0	0.06	80	3/64	0.469	52	0.0635	50	0.07
1	0.073	64	53	0.0595	48	0.076	46	0.081
1	0.073	72	53	0.0595	48	0.076	46	0.081
2	0.086	56	50	0.07	43	0.089	41	0.096
2	0.086	64	50	0.07	43	0.089	41	0.096
3	0.099	48	47	0.0785	37	0.104	35	0.11
3	0.099	56	45	0.082	37	0.104	35	0.11
4	0.112	36	44	0.086	32	0.116	30	0.1285
4	0.112	40	43	0.089	32	0.116	30	0.1285
4	0.112	48	42	0.0935	32	0.116	30	0.1285
5	0.125	40	38	0.1015	30	0.1285	29	0.136
5	0.125	44	37	0.104	30	0.1285	29	0.136
6	0.138	32	36	0.1065	27	0.144	25	0.1495
6	0.138	40	33	0.113	27	0.144	25	0.1495
8	0.164	32	29	0.136	18	0.1695	16	0.177
8	0.164	36	29	0.136	18	0.1695	16	0.177
10	0.19	24	25	0.1495	9	0.196	7	0.201
10	0.19	32	21	0.159	9	0.196	7	0.201
12	0.216	24	16	0.177	2	0.221	I	0.228
12	0.216	28	14	0.182	2	0.221	I	0.228
14	0.242	20	10	0.1935	D	0.246	F	0.257
14	0.242	24	7	0.201	D	0.246	F	0.257
1/4	0.25	20	7	0.201	F	0.257	H	0.266
1/4	0.25	28	3	0.213	F	0.257	H	0.266
5/16	0.3125	18	F	0.257	P	0.323	Q	0.332
5/16	0.3125	24	I	0.272	P	0.323	Q	0.332
3/8	0.375	16	5/16	0.3125	W	0.386	X	0.397
3/8	0.375	24	Q	0.332	W	0.386	X	0.397
7/16	0.4375	14	U	0.368	29/64	0.4531	15/32	0.4687
7/16	0.4375	20	25/64	0.3906	29/64	0.4531	15/32	0.4687
1/2	0.5	13	27/64	0.4219	33/64	0.5156	17/32	0.5312
1/2	0.5	20	29/64	0.4531	33/64	0.5156	17/32	0.5312