Tap and Clearance Hole Chart – Imperial

Imperial Drill Chart NightShade Electronics
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Machine Screw Size Tap Drills Clearance Hole Diameters
Aluminum
Brass & Plastic
75% Thread
Stainless Steel
Steels & Iron
50% Thread
All Materials
Close Fit Free Fit
Name Major Dia.
(in)
Threads Per Inch American
Drill Size
Decimal Equiv.
(in)
American
Drill Size
Decimal Equiv.
(in)
American
Drill Size
Decimal Equiv. American
Drill Size
Decimal Equiv.
#0 .0600 80 3/64 .0469 55 .0520 52 .0635 50 .0700
#1 .0730 64 53 .0595 1/16 .0625 48 .0760 46 .0810
72 53 .0595 52 .0635
#2 .0860 56 50 .0700 49 .0730 43 .0890 41 .0960
64 50 .0700 48 .0760
#3 .0990 48 47 .0785 44 .0860 37 .1040 35 .1100
56 45 .0820 43 .0890
#4 .1120 40 43 .0890 41 .0960 32 .1160 30 .1285
48 42 .0935 40 .0980
#5 .1250 40 38 .1015 7/64 .1094 30 .1285 29 .1360
44 37 .1040 35 .1100
#6 .1380 32 36 .1065 32 .1160 27 .1440 25 .1495
40 33 .1130 31 .1200
#8 .1640 32 29 .1360 27 .1440 18 .1695 16 .177
36 29 .1360 26 .1470
#10 .1900 24 25 .1495 20 .1610 9 .1960 7 .2010
32 21 .1590 18 .1695
#12 .2160 24 16 .1770 12 .1890 2 .2210 1 .2280
28 14 .1820 10 .1935
32 13 .1850 9 .1960
1/4 .2500 20 7 .2010 7/32 .2188 F .2570 H .2660
28 3 .2130 1 .2280
32 7/32 .2188 1 .2280
5/16 .3125 18 F .2570 J .2770 P .3230 Q .3320
24 I .2720 9/32 .2812
32 9/32 .2812 L .2900
3/8 .3750 16 5/16 .3125 Q .3320 W .3860 X .3970
24 Q .3320 S .3480
32 11/32 .3438 T .3580
7/16 .4375 14 U .3680 25/64 .3906 29/64 .4531 15/32 .4687
20 25/64 .3906 13/32 .4062
28 Y .4040 Z .4130
1/2 .5000 13 27/64 .4219 29/64 .4531 33/64 .5156 17/32 .5312
20 29/64 .4531 15/32 .4688
28 15/32 .4688 15/32 .4688
9/16 .5625 12 31/64 .4844 33/64 .5156 37/64 .5781 19/32 .5938
18 33/64 .5156 17/32 .5312
24 33/64 .5156 17/32 .5312
5/8 .6250 11 17/32 .5312 9/16 .5625 41/64 .6406 2132 .6562
18 37/64 .5781 19/32 .5938
24 37/64 .5781 19/32 .5938
11/16 .6875 24 41/64 .6406 21/32 .6562 45/64 .7031 23/32 .7188
3/4 .7500 10 21/32 .6562 11/16 .6875 49/64 .7656 25/32 .7812
16 11/16 .6875 45/64 .7031
20 45/64 .7031 23/32 .7188
13/16 .8125 20 49/64 .7656 25/32 .7812 53/94 .8281 27/32 .8438
7/8 .8750 9 49/64 .7656 51/64 .7969 57/64 .8906 29/32 .9062
14 13/16 .8125 53/64 .8281
20 53/64 .8281 27/32 .8438
15/16 0.9375 20 57/64 0.8906 29/32 0.9062 61/64 .9531 31/32 .9688
1 1.00 8 7/8 .8750 59/64 .9219 1-1/64 1.0156 1-1/32 1.0313
12 15/16 .9375 61/64 .9531
20 61/64 .9531 31/32 .9688