Imperial Tap Drill Sizes
| Fraction/Drill Size |
Dec. Equivalent |
__Tap Size__ |
| 80 |
.0135 |
|
| 79 |
.0145 |
|
| 1/64 |
.0156 |
|
| 78 |
.0160 |
|
| 77 |
.0180 |
|
| 76 |
.0200 |
|
| 75 |
.0210 |
|
| 74 |
.0225 |
|
| 73 |
.0240 |
|
| 72 |
.0250 |
|
| 71 |
.0260 |
|
| 70 |
.0280 |
|
| 69 |
.0292 |
|
| 68 |
.0310 |
|
| 1/32 |
.0312 |
|
| 67 |
.0320 |
|
| 66 |
.0330 |
|
| 65 |
.0350 |
|
| 64 |
.0360 |
|
| 63 |
.0370 |
|
| 62 |
.0380 |
|
| 61 |
.0390 |
|
| 60 |
.0400 |
|
| 59 |
.0410 |
|
| 58 |
.0420 |
|
| 57 |
.0430 |
|
| 56 |
.0465 |
|
| 3/64 |
.0469 |
0 - 80 |
| 55 |
.0520 |
|
| 54 |
.0550 |
|
| 53 |
.0595 |
1 - 64, 72 |
| 1/16 |
.0625 |
|
| 52 |
.0635 |
|
| 51 |
.0670 |
|
| 50 |
.0700 |
2 - 56, 64 |
| 49 |
.0730 |
|
| 48 |
.0760 |
|
| 5/64 |
.0781 |
|
| 47 |
.0785 |
3 - 48 |
| 46 |
.0810 |
|
| 45 |
.0820 |
3 - 56 |
| 44 |
.0860 |
|
| 43 |
.0890 |
4 - 40 |
| 42 |
.0935 |
4 - 48 |
| 3/32 |
.0938 |
|
| 41 |
.0960 |
|
| 40 |
.0980 |
|
| 39 |
.0995 |
|
| 38 |
.1015 |
5 - 40 |
| 37 |
.1040 |
5 - 44 |
| 36 |
.1065 |
6 - 32 |
| 7/64 |
.1094 |
|
| 35 |
.1100 |
|
| 34 |
.1110 |
|
| 33 |
.1130 |
6 - 40 |
| 32 |
.1160 |
|
| 31 |
.1200 |
|
| 1/8 |
.1250 |
|
| 30 |
.1258 |
|
| 29 |
.1360 |
8 - 32, 36 |
| 28 |
.1405 |
|
| 9/64 |
.1406 |
|
| 27 |
.1440 |
|
| 26 |
.1470 |
|
| 25 |
.1495 |
10 - 24 |
| 24 |
.1520 |
|
| 23 |
.1540 |
|
| 5/32 |
.1562 |
|
| 22 |
.1570 |
|
| 21 |
.1590 |
10 - 32 |
| 20 |
.1610 |
|
| 19 |
.1660 |
|
| 18 |
.1695 |
|
| 11/64 |
.1719 |
|
| 17 |
.1730 |
|
| 16 |
.1770 |
12 - 24 |
| 15 |
.1800 |
|
| 14 |
.1820 |
12 - 28 |
| 13 |
.1850 |
|
| 3/16 |
.1875 |
|
| 12 |
.1890 |
|
| 11 |
.1910 |
|
| 10 |
.1935 |
|
| 9 |
.1960 |
|
| 8 |
.1990 |
|
| 7 |
.2010 |
1/4 - 20 |
| 13/64 |
.2031 |
|
| 6 |
.2040 |
|
| 5 |
.2055 |
|
| 4 |
.2090 |
|
| 3 |
.2130 |
1/4 - 28 |
| 7/32 |
.2188 |
|
| 2 |
.2210 |
|
| 1 |
.2280 |
|
| A |
.2340 |
|
| 15/64 |
.2344 |
|
| B |
.2380 |
|
| C |
.2420 |
|
| D |
.2460 |
|
| 1/4 - E |
.2500 |
|
| F |
.2570 |
5/16 - 18 |
| G |
.2610 |
|
| 17/64 |
.2656 |
|
| H |
.2660 |
|
| I |
.2720 |
5/16 - 24 |
| J |
.2770 |
|
| K |
.2810 |
|
| 9/32 |
.2812 |
|
| L |
.2900 |
|
| M |
.2950 |
|
| 19/64 |
.2969 |
|
| N |
.3020 |
|
| 5/16 |
.3125 |
3/8 - 16 |
| O |
.3160 |
|
| P |
.3230 |
|
| 21/64 |
.3281 |
|
| Q |
.3320 |
3/8 - 24 |
| R |
.3390 |
|
| 11/32 |
.3438 |
|
| S |
.3480 |
|
| T |
.3580 |
|
| 23/64 |
.3594 |
|
| U |
.3680 |
7/16 - 14 |
| 3/8 |
.3750 |
|
| V |
.3770 |
|
| W |
.3860 |
|
| 25/64 |
.3906 |
7/16 - 20 |
| X |
.3970 |
|
| Y |
.4040 |
|
| 13/32 |
.4062 |
|
| Z |
.4130 |
|
| 27/64 |
.4219 |
1/2 - 13 |
| 7/16 |
.4375 |
|
| 29/64 |
.4531 |
1/2 - 20 |
| 15/32 |
.4688 |
|
| 31/64 |
.4844 |
9/16 - 12 |
| 1/2 |
.5000 |
|
| 33/64 |
.5156 |
9/16 - 18 |
| 17/32 |
.5312 |
5/8 - 11 |
| 35/64 |
.5469 |
|
| 9/16 |
.5625 |
|
| 37/64 |
.5781 |
5/8 - 18 |
| 19/32 |
.5938 |
|
| 39/64 |
.6094 |
|
| 5/8 |
.6250 |
|
| 41/64 |
.6406 |
|
| 21/32 |
.6562 |
3/4 - 10 |
| 43/64 |
.6719 |
|
| 11/16 |
.6875 |
3/4 - 16 |
| 45/64 |
.7031 |
|
| 23/32 |
.7188 |
|
| 47/64 |
.7344 |
|
| 3/4 |
.7500 |
|
| 49/64 |
.7656 |
7/8 - 9 |
| 25/32 |
.7812 |
|
| 51/64 |
.7969 |
|
| 13/16 |
.8125 |
7/8 - 14 |
| 53/64 |
.8281 |
|
| 27/32 |
.8438 |
|
| 55/64 |
.8594 |
|
| 7/8 |
.8750 |
1 - 8 |
| 57/64 |
.8906 |
|
| 29/32 |
.9062 |
|
| 59/64 |
.9219 |
1 - 12 |
| 15/16 |
.9375 |
|
| 61/64 |
.9531 |
|
| 31/32 |
.9688 |
|
| 63/64 |
.9844 |
1.125 - 7 |
| 1" |
1.000 |
|
