Drill Tap and Clearance Chart

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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
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