Drill Tap and Clearance Chart
From Eleccelerator Wiki
Imperial
Screw Size | Major Diameter | Threads Per Inch | Minor Diameter | Tap Drill | Clearance Drill | ||||||
75% Thread for Aluminum, Brass,& Plastics | 50% Thread for Steel, Stainless,& Iron | Close Fit | Free Fit | ||||||||
Drill Size | Decimal Equiv. | Drill Size | Decimal Equiv. | Drill Size | Decimal Equiv. | Drill Size | Decimal Equiv. | ||||
0 | 0.0600 | 80 | 0.0447 | 3/64 | 0.0469 | 55 | 0.0520 | 52 | 0.0635 | 50 | 0.0700 |
1 | 0.0730 | 64 | 0.0538 | 53 | 0.0595 | 1/16 | 0.0625 | 48 | 0.0760 | 46 | 0.0810 |
72 | 0.0560 | 53 | 0.0595 | 52 | 0.0635 | ||||||
2 | 0.0860 | 56 | 0.0641 | 50 | 0.0700 | 49 | 0.0730 | 43 | 0.0890 | 41 | 0.0960 |
64 | 0.0668 | 50 | 0.0700 | 48 | 0.0760 | ||||||
3 | 0.0990 | 48 | 0.0734 | 47 | 0.0785 | 44 | 0.0860 | 37 | 0.1040 | 35 | 0.1100 |
56 | 0.0771 | 45 | 0.0820 | 43 | 0.0890 | ||||||
4 | 0.1120 | 40 | 0.0813 | 43 | 0.0890 | 41 | 0.0960 | 32 | 0.1160 | 30 | 0.1285 |
48 | 0.0864 | 42 | 0.0935 | 40 | 0.0980 | ||||||
5 | 0.125 | 40 | 0.0943 | 38 | 0.1015 | 7/64 | 0.1094 | 30 | 0.1285 | 29 | 0.1360 |
44 | 0.0971 | 37 | 0.1040 | 35 | 0.1100 | ||||||
6 | 0.138 | 32 | 0.0997 | 36 | 0.1065 | 32 | 0.1160 | 27 | 0.1440 | 25 | 0.1495 |
40 | 0.1073 | 33 | 0.1130 | 31 | 0.1200 | ||||||
8 | 0.1640 | 32 | 0.1257 | 29 | 0.1360 | 27 | 0.1440 | 18 | 0.1695 | 16 | 0.1770 |
36 | 0.1299 | 29 | 0.1360 | 26 | 0.1470 | ||||||
10 | 0.1900 | 24 | 0.1389 | 25 | 0.1495 | 20 | 0.1610 | 9 | 0.1960 | 7 | 0.2010 |
32 | 0.1517 | 21 | 0.1590 | 18 | 0.1695 | ||||||
12 | 0.2160 | 24 | 0.1649 | 16 | 0.1770 | 12 | 0.1890 | 2 | 0.2210 | 1 | 0.2280 |
28 | 0.1722 | 14 | 0.1820 | 10 | 0.1935 | ||||||
32 | 0.1777 | 13 | 0.1850 | 9 | 0.1960 | ||||||
1/4 | 0.2500 | 20 | 0.1887 | 7 | 0.2010 | 7/32 | 0.2188 | F | 0.2570 | H | 0.2660 |
28 | 0.2062 | 3 | 0.2130 | 1 | 0.2280 | ||||||
32 | 0.2117 | 7/32 | 0.2188 | 1 | 0.2280 | ||||||
5/16 | 0.3125 | 18 | 0.2443 | F | 0.2570 | J | 0.2770 | P | 0.3230 | Q | 0.3320 |
24 | 0.2614 | I | 0.2720 | 9/32 | 0.2812 | ||||||
32 | 0.2742 | 9/32 | 0.2812 | L | 0.2900 | ||||||
3/8 | 0.3750 | 16 | 0.2983 | 5/16 | 0.3125 | Q | 0.3320 | W | 0.3860 | X | 0.3970 |
24 | 0.3239 | Q | 0.3320 | S | 0.3480 | ||||||
32 | 0.3367 | 11/32 | 0.3438 | T | 0.3580 | ||||||
7/16 | 0.4375 | 14 | 0.3499 | U | 0.3680 | 25/64 | 0.3906 | 29/64 | 0.4531 | 15/32 | 0.4687 |
20 | 0.3762 | 25/64 | 0.3906 | 13/32 | 0.4062 | ||||||
28 | 0.3937 | Y | 0.4040 | Z | 0.4130 | ||||||
1/2 | 0.5000 | 13 | 0.4056 | 27/64 | 0.4219 | 29/64 | 0.4531 | 33/64 | 0.5156 | 17/32 | 0.5312 |
20 | 0.4387 | 29/64 | 0.4531 | 15/32 | 0.4688 | ||||||
28 | 0.4562 | 15/32 | 0.4688 | 15/32 | 0.4688 | ||||||
9/16 | 0.5625 | 12 | 0.4603 | 31/64 | 0.4844 | 33/64 | 0.5156 | 37/64 | 0.5781 | 19/32 | 0.5938 |
18 | 0.4943 | 33/64 | 0.5156 | 17/32 | 0.5312 | ||||||
24 | 0.5114 | 33/64 | 0.5156 | 17/32 | 0.5312 | ||||||
5/8 | 0.6250 | 11 | 0.5135 | 17/32 | 0.5312 | 9/16 | 0.5625 | 41/64 | 0.6406 | 21/32 | 0.6562 |
18 | 0.5568 | 37/64 | 0.5781 | 19/32 | 0.5938 | ||||||
24 | 0.5739 | 37/64 | 0.5781 | 19/32 | 0.5938 | ||||||
11/16 | 0.6875 | 24 | 0.6364 | 41/64 | 0.6406 | 21/32 | 0.6562 | 45/64 | 0.7031 | 23/32 | 0.6562 |
3/4 | 0.7500 | 10 | 0.6273 | 21/32 | 0.6562 | 11/16 | 0.6875 | 49/64 | 0.7656 | 25/32 | 0.7812 |
16 | 0.6733 | 11/16 | 0.6875 | 45/64 | 0.7031 | ||||||
20 | 0.6887 | 45/64 | 0.7031 | 23/32 | 0.7188 | ||||||
13/16 | 0.8125 | 20 | 0.7512 | 49/64 | 0.7656 | 25/32 | 0.7812 | 53/64 | 0.8281 | 27/32 | 0.8438 |
7/8 | 0.8750 | 9 | 0.7387 | 49/64 | 0.7656 | 51/64 | 0.7969 | 57/64 | 0.8906 | 29/32 | 0.9062 |
14 | 0.7874 | 13/16 | 0.8125 | 53/64 | 0.8281 | ||||||
20 | 0.8137 | 53/64 | 0.8281 | 27/32 | 0.8438 | ||||||
15/16 | 0.9375 | 20 | 0.8762 | 57/64 | 0.8906 | 29/32 | 0.9062 | 61/64 | 0.9531 | 31/32 | 0.9688 |
1 | 1.000 | 8 | 0.8466 | 7/8 | 0.8750 | 59/64 | 0.9219 | 1-1/64 | 1.0156 | 1-1/32 | 1.0313 |
12 | 0.8978 | 15/16 | 0.9375 | 61/64 | 0.9531 | ||||||
20 | 0.9387 | 61/64 | 0.9531 | 31/32 | 0.9688 |