Drill and Tap Sizes Chart

English and Metric Provided

English

Drill Size	Decimal	Tap Size
80	0.0135
79	0.0145
1/64	0.0156
78	0.0160
77	0.0180
76	0.0200
75	0.0210
74	0.0225
73	0.0240
72	0.0250
71	0.0260
70	0.0280
69	0.0292
68	0.0310
1/32	0.0312
67	0.0320
66	0.0330
65	0.0350
64	0.0360
63	0.0370
62	0.0380
61	0.0390
60	0.0400
59	0.0410
58	0.0420
57	0.0430
56	0.0465
3/64	0.0469	0-80
55	0.0520
54	0.0550
53	0.0595	1-64, 72
1/16	0.0625
52	0.0635
51	0.0670
50	0.0700	2-56, 64
79	0.0730
78	0.0760
5/64	0.0781
47	0.0785	3-48
46	0.0810
45	0.0820	3-56
44	0.0860
43	0.0890	4-40
42	0.0935	4-48
3/32	0.0938
41	0.0960
40	0.0980
39	0.0995
38	0.1015	5-40
37	0.1040	5-44
36	0.1065	6-32
7/64	0.1094
35	0.1100
34	0.1110
33	0.1130	6-40
32	0.1160
31	0.1200
1/8	0.1250
30	0.1285
29	0.1360	8-32, 36
28	0.1405
9/64	0.1046
27	0.1440
26	0.1470
25	0.1495
24	0.1520
23	0.1540
5/32	0.1562
22	0.1570
21	0.1590
20	0.1610
19	0.1660
18	0.1695
11/64	0.1719
17	0.1730
16	0.1770
15	0.1800
14	0.1820
13	0.1850
3/16	0.1875
12	0.1890
11	0.1910
10	0.1935
9	0.1960
8	0.1990
7	0.2010	1/4-20
13/64	0.2031
6	0.2040
5	0.2055
4	0.2090
3	0.2130	1/4-28
7/32	0.2188
2	0.2210
1	0.2280
A	0.2340
15/64	0.2344
B	0.2380
C	0.2420
D	0.2460
E, 1/4	0.2500
F	0.2570	5/16-18
G	0.2610
17/64	0.2656
H	0.2660
I	0.2720	5/16-24
J	0.2770
K	0.2810
9/32	0.2812
L	0.2900
M	0.2950
19/64	0.2969
N	0.3020
5/16	0.3125	3/8-16
O	0.3160
P	0.3230
21/64	0.3281
Q	0.3320	3/8-24
R	0.3390
11/32	0.3438
S	0.3480
T	0.3580
23/64	0.3594
U	0.3680	7/16-14
3/8	0.3750
V	0.3770
W	0.3860
25/64	0.3906	7/16-20
X	0.3970
Y	0.4040
13/32	0.4062
Z	0.4130
27/64	0.4219	1/2-13
7/16	0.4375
29/64	0.4531	1/2-20
15/32	0.4688
31/64	0.4844	9/16-12
1/2	0.5000
33/64	0.5156	9/16-18
17/32	0.5312	5/8-11
35/64	0.5469
9/16	0.5625
37/64	0.5781	5/8-18
19/32	0.5938
39/64	0.6094
5/8	0.6250
41/64	0.6406
21/32	0.6562	3/4-10
43/64	0.6719
11/16	0.6875	3/4-16
45/64	0.7031
23/32	0.7188
47/64	0.7344
3/4	0.7500
49/64	0.7656	7/8-9
25/32	0.7812
51/64	0.7969
13/16	0.8125	7/8-14
53/64	0.8281
27/32	0.8438
55/64	0.8594
7/8	0.8750	1-8
57/64	0.8906
29/32	0.9062
59/64	0.9219	1-12
15/16	0.9375	1-14
61/64	0.9531
31/32	0.9688
63/64	0.9844	1 1/8-7
1	1.0000
1 3/64	1.0469	1 1/8-12
1 7/64	1.1094	1 1/4-7
1 1/8	1.1250
1 11/64	1.1719	1 1/4-12
1 7/32	1.2188	1 3/8-6
1 1/4	1.2500
1 19/64	1.2969	1 3/8-12
1 11/32	1.3438	1 1/2-6
1 3/8	1.3750
1 27/64	1.4219	1 1/2-12
1 1/2	1.5000

Metric Taps

Metric Tap	Tap Drill (mm)	Decimal (in)
M1.6 x 0.35	1.25	.0492
M1.8 x 0.35	1.45	.0571
M2 x 0.4	1.60	.0630
M2.2 x 0.45	1.75	.0689
M2.5 x 0.45	2.05	.0807
M3 x 0.5	2.50	.0984
M3.5 x 0.6	2.90	.1142
M4 x 0.7	3.30	.1299
M4.5 x 0.75	3.70	.1457
M5 x 0.8	4.20	.1654
M6 x 1	5.00	.1968
M7 x 1	6.00	.2362
M8 x 1.25	6.70	.2638
M8 x 1.25	7.00	.2756
M10 x 1.5	8.50	.3346
M10 x 1.25	8.70	.3425
M12 x 1.75	10.20	.4016
M12 x 1.25	10.80	.4252
M14 x 2	12.00	.4724
M14 x 1.5	12.50	.4921
M16 x 2	14.00	.5512
M16 x 1.5	14.50	.5709
M18 x 2.5	15.50	.6102
M18 x 1.5	16.50	.6496
M20 x 2.5	17.50	.6890
M20 x 1.5	18.50	.7283
M22 x 2.5	19.50	.7677
M22 x 1.5	20.50	.8071
M24 x 3	21.00	.8268
M24 x 2	22.00	.8661
M27 x 3	24.00	.9449
M27 x 2	25.00	.9843
M30 x 3.5	26.50	1.0433
M30 x 2	28.00	1.1024
M33 x 3.5	29.50	1.1614
M33 x 2	31.00	1.2205
M36 x 4	32.00	1.2568
M36 x 3	33.00	1.2992
M39 x 4	35.00	1.3780
M39 x 3	36.00	1.4173

• Provided for convenience only.  Not responsible for errors.  Use at your risk.