Decimal Equivalent / Drill Tap Charts

CONVERSION CHART
Drill Size Decimal Equivalent

Drill Size	mm	Dec. Equiv.
–	0.10	.0039
–	0.20	.0079
–	0.25	.0098
–	0.30	.0118
80	0.34	.0135
79	0.37	.0145
1/64	0.40	.0156
78	0.41	.0160
77	0.46	.0180
–	0.50	.0197
76	0.51	.0200
75	0.53	.0210
74	0.57	.0225
–	0.60	.0236
73	0.61	.0240
72	0.64	.0250
71	0.66	.0260
–	0.70	.0276
70	0.71	.0280
69	0.74	.0292
–	0.75	.0295
68	0.79	.0310
1/32	0.79	.0313
–	0.80	.0315
67	0.81	.0320
66	0.84	.0330
65	0.89	.0350
–	0.90	.0354
64	0.91	.0360
63	0.94	.0370
62	0.97	.0380
61	0.99	.0390
–	1.00	.0394
60	1.02	.0400
59	1.04	.0410
58	1.07	.0420
57	1.09	.0430
56	1.18	.0465
3/64	1.19	.0469
55	1.32	.0520
54	1.40	.0550
53	1.51	.0595
1/16	1.59	.0625
52	1.61	.0635
51	1.70	.0670
50	1.78	.0700
49	1.85	.0730
48	1.93	.0760
5/64	1.98	.0781
47	1.99	.0785
–	2.00	.0787
46	2.06	.0810
45	2.08	.0820
44	2.18	.0860
43	2.26	.0890
42	2.37	.0935
3/32	2.38	.0938
41	2.44	.0960
40	2.50	.980
39	2.53	.0995
38	2.58	.1015
37	2.64	.1040
36	2.71	.1065
7/64	2.78	.1094
35	2.79	.1100
34	2.82	.1110
33	2.87	.1130
32	2.95	.1160
–	3.00	.1181
31	3.05	.1200
1/8	3.18	.1250
30	3.26	.1285
29	3.45	.1360
28	3.57	.1405
9/64	3.57	.1406
27	3.66	.1440
26	3.73	.1470
25	3.80	.1495
24	3.86	.1520
23	3.91	.1540
5/32	3.97	.1562
22	3.99	.1570
–	4.00	.1575
21	4.04	.1590
20	4.09	.1610
19	4.22	.1660
18	4.31	.1695
11/64	4.37	.1719
17	4.39	.1730
16	4.50	.1770
15	4.57	.1800
14	4.62	.1820
13	4.70	.1850
3/16	4.76	.1875
12	4.80	.1890
11	4.85	.1910
10	4.91	.1935
9	4.98	.1960
–	5.00	.1968
8	5.05	.1990
7	5.11	.2010
13/64	5.16	.2031
6	5.18	.2040
5	5.22	.2055
4	5.31	.2090
3	5.41	.2130
7/32	5.56	.2188
2	5.61	.2210
1	5.79	.2280
A	5.94	.2340
15/64	5.95	.2344
–	6.00	.2362
B	6.05	.2380
C	6.15	.2420
D	6.25	.2460
1/4	6.35	.2500
E	6.35	.2500
F	6.53	.2570
G	6.63	.2610
17/64	6.75	.2656
H	6.76	.2660
I	6.91	.2720
–	7.00	.2756
J	7.04	.2770
K	7.14	.2810
9/32	7.14	.2812
L	7.37	.2900
M	7.49	.2950
19/64	7.54	.2969
N	7.67	.3020
5/16	7.94	.3125
–	8.00	.3150
O	8.03	.3160
P	8.20	.3230
21/64	8.33	.3281
Q	8.43	.3320
R	8.61	.3390
11/32	8.73	.3438
S	8.84	.3480
–	9.00	.3543
T	9.09	.3580
23/64	9.13	.3594
U	9.35	.3680
3/8	9.53	.3750
V	9.56	.3770
W	9.80	.3860
25/64	9.92	.3906
–	10.00	.3937
X	10.08	.3970
Y	10.26	.4040
13/32	10.32	.4062
Z	10.49	.4130
24/64	10.72	.4219
–	11.00	.4331
7/16	11.11	.4375
29/64	11.51	.4531
15/32	11.91	.4688
–	12.00	.4724
31/64	12.30	.4844
1/2	12.70	.5000
–	13.00	.5118
33/64	13.10	.5156
17/32	13.49	.5312
35/64	13.89	.5469
–	14.00	.5512
9/16	14.29	.5625
37/64	14.68	.5781
–	15.00	.5906
19/32	15.08	.5938
39/64	15.48	.6094
5/8	15.88	.6250
–	16.00	.6299
41/64	16.27	.6406
21/32	16.67	.6562
–	17.00	.6693
43/64	17.07	.6719
11/16	17.46	.6875
45/64	17.86	.7031
–	18.00	.7087
23/32	18.26	.7188
47/64	18.65	.7344
–	19.00	.7480
3/4	19.05	.7500
49/64	19.45	.7656
24/32	19.84	.7812
–	20.00	.7874
51/64	20.24	.7969
13/16	20.64	.8125
–	21.00	.8269
53/64	21.03	.8282
27/32	21.43	.8438
55/64	21.84	.8594
–	22.00	.8661
7/8	22.23	.8750
57/64	22.62	.8906
–	23.00	.9055
29/32	23.02	.9062
59/64	23.42	.9219
15/16	23.81	.9375
–	24.00	.9449
61/64	24.21	.9531
31/32	24.61	.9688
–	25.00	.9842
63/64	25.00	.9844
1	25.40	1.0000

TAP DRILL CHART

Tap Size	Drill Size	Probable% of Thread
0-80	3/64	71-81
M1.6x.35	1.25mm	67-77
1-64	53	59-67
M2x.4	1/16	72-79
1-72	53	67-75
2-56	51	62-69
2-64	50	70-79
M2.5x.45	2.05mm	69-77
3-48	5/64	70-77
3-56	46	69-78
4-40	44	65-71
4-48	42	61-68
M3x.5	40	70-79
5-40	39	65-72
5-44	38	63-71
M3.5x.6	33	72-81
6-32	36	71-78
6-40	33	69-77
M4x.7	3.25mm	74-82
8-32	29	62-69
8-36	29	70-78
10-24	25	69-75
10-32	21	68-76
M5x.8	4.2mm	69-77
12-24	17	66-72
12-28	15	70-78
M6x1	10	76-84
1/4-20	7	70-75
1/4-28	3	72-80
5/16-18	F	72-77
5/16-24	I	67-75
M81.25	6.7mm	74-80
3/8-16	5/16	72-77
3/8-24	Q	71-79
M10x1.5	8.4mm	76-82
7/16-14	U	70-75
7/16-20	25/64	65-72
M12x1.75	13/32	69-74
1/2-13	27/64	73-78
1/2-20	29/64	65-72
M14x2	15/32	76-81
9/16-12	31/64	68-72
9/16-18	33/64	58-65
5/8-11	17/32	75-79
5/8	37/64	58-65
M16x2	35/64	76-81
3/4-10	21/32	68-72
3/4-16	11/16	71-77
M20x2.5	11/16	74-78
7/8-9	49/64	72-76
7/8-14	13/16	62-67
M24x3	53/64	72-76
1-8	7/8	73-77
1-12	59/64	67-72
1-14	15/16	61-67
1-1/8-7	63/64	72-76
1/18-12	1-3/64	66-72
M30x3.5	1-3/64	75
-1/4-7	1-7/64	76
1-1/4-12	1-11/64	72
1-3/8-6	1-7/32	72
1-3/8-12	1-19/64	72
M36x4	1-1/4	82
1-1/2-6	1-11/32	72
1-1/2-12	1-27/64	72