Decimal Equivalent Chart | |||
Decimal Equivalent |
Drill Size |
mm |
TapSize |
.0059 | 97 | 0.150 | |
.0063 | 96 | 0.160 | |
.0067 | 95 | 0.170 | |
.0071 | 94 | 0.180 | |
.0075 | 96 | 0.191 | |
.0079 | 92 | 0.201 | |
.0083 | 91 | 0.211 | |
.0087 | 90 | 0.221 | |
.0091 | 89 | 0.231 | |
.0095 | 88 | 0.241 | |
.0100 | 87 | 0.254 | |
.0105 | 86 | 0.267 | |
.0110 | 85 | 0.279 | |
.0115 | 84 | 0.292 | |
.0120 | 83 | 0.305 | |
.0125 | 82 | 0.318 | |
.0130 | 81 | 0.330 | |
.0135 | 80 | 0.343 | |
.0145 | 79 | 0.368 | |
.0156 | 1/64 | 0.397 | |
.0160 | 78 | 0.406 | |
.0180 | 77 | 0.457 | |
.0200 | 76 | 0.508 | |
.0210 | 75 | 0.533 | |
.0225 | 74 | 0.572 | |
.0240 | 73 | 0.610 | |
.0250 | 72 | 0.635 | |
.0260 | 71 | 0.660 | |
.0280 | 70 | 0.711 | |
.0292 | 69 | 0.742 | |
.0310 | 68 | 0.787 | |
.0313 | 1/32 | 0.794 | |
.0320 | 67 | 0.813 | |
.0330 | 66 | 0.838 | |
.0350 | 65 | 0.889 | |
.0360 | 64 | 0.914 | |
.0370 | 63 | 0.940 | |
.0380 | 62 | 0.965 | |
.0390 | 61 | 0.991 | |
.0400 | 60 | 1.016 | |
.0410 | 59 | 1.041 | |
.0420 | 58 | 1.067 | |
.0430 | 57 | 1.092 | |
.0465 | 56 | 1.181 | |
.0469 | 3/64 | 1.191 | #0-80 |
.0520 | 55 | 1.321 | |
.0550 | 54 | 1.397 | |
.0595 | 53 | 1.511 | #1-64 #1-72 |
.0625 | 1/16 | 1.588 | |
.0635 | 52 | 1.613 | |
.0670 | 51 | 1.702 | |
.0700 | 50 | 1.778 | #2-56 #2-64 |
.0730 | 49 | 1.854 | |
.0760 | 48 | 1.930 | |
.0781 | 5/64 | 1.984 | |
.0785 | 47 | 1.994 | #3-48 |
.0810 | 46 | 2.057 | |
.0820 | 45 | 2.083 | #3-56 |
.0860 | 44 | 2.184 | |
.0890 | 43 | 2.261 | #4-40 |
.0935 | 42 | 2.375 | #4-48 |
.0938 | 3/32 | 2.381 | |
.0960 | 41 | 2.438 | |
.0980 | 40 | 2.489 | |
.0995 | 39 | 2.527 | |
.1015 | 38 | 2.578 | #5-40 |
.1040 | 37 | 2.642 | #5-44 |
.1065 | 36 | 2.705 | #6-32 |
.1094 | 7/64 | 2.778 | |
.1100 | 35 | 2.794 | |
.1110 | 34 | 2.819 | |
.1130 | 33 | 2.870 | #6-40 |
.1160 | 32 | 2.946 | |
.1200 | 31 | 3.048 | |
.1250 | 1/8 | 3.175 | |
.1285 | 30 | 3.264 | |
.1360 | 29 | 3.454 | #8-32 #8-36 |
.1405 | 28 | 3.569 | |
.1406 | 9/64 | 3.572 | |
.1440 | 27 | 3.658 | |
.1470 | 26 | 3.734 | |
.1495 | 25 | 3.797 | |
.1520 | 24 | 3.861 | |
.1540 | 23 | 3.912 | |
.1563 | 5/32 | 3.969 | |
.1570 | 22 | 3.988 | |
.1590 | 21 | 4.039 | #10-32 |
.1610 | 20 | 4.089 | |
.1660 | 19 | 4.216 | |
.1695 | 18 | 4.305 | |
.1719 | 11/64 | 4.366 | |
.1730 | 17 | 4.394 | |
.1770 | 16 | 4.496 | |
.1800 | 15 | 4.572 | |
.1820 | 14 | 4.623 | |
.1850 | 13 | 4.699 | |
.1875 | 3/16 | 4.763 | #12-32 |
.1890 | 12 | 4.801 | |
.1910 | 11 | 4.851 | |
.1935 | 10 | 4.915 | |
.1960 | 9 | 4.978 | |
.1990 | 8 | 5.055 | |
.2010 | 7 | 5.105 | ¼-20 |
.2031 | 13/64 | 4.159 | |
.2040 | 6 | 5.182 | |
.2055 | 5 | 5.220 | |
.2090 | 4 | 5.309 | |
.2130 | 3 | 5.410 | ¼-28 |
.2188 | 7/32 | 5.556 | |
.2210 | 2 | 5.613 | |
.2280 | 1 | 5.791 | |
.2340 | A | 5.944 | |
.2344 | 15/64 | 5.953 | |
.2380 | B | 6.045 | |
.2420 | C | 6.147 | |
.2460 | D | 6.248 | |
.2500 | ¼ & E | 6.350 | |
.2570 | F | 6.528 | 5/16-18 |
.2610 | G | 6.629 | |
.2656 | 17/64 | 6.747 | |
.2660 | H | 6.756 | |
.2720 | I | 6.909 | 5/16-24 |
.2770 | J | 7.036 | |
.2810 | K | 7.137 | |
.2813 | 9/32 | 7.144 | 5/16-32 |
.2900 | L | 7.366 | |
.2950 | M | 7.493 | |
.2969 | 19/64 | 7.541 | |
.3020 | N | 7.671 | |
.3125 | 5/16 | 7.938 | 3/8-16 |
.3160 | O | 8.026 | |
.3230 | P | 8.204 | |
.3281 | 21/64 | 8.334 | |
.3320 | Q | 8.433 | 3/8-24 |
.3390 | R | 8.611 | |
.3438 | 11/32 | 8.731 | 3/8-32 |
.3480 | S | 8.839 | |
.3580 | T | 9.093 | |
.3594 | 23/64 | 9.128 | |
.3680 | U | 9.347 | 7/16-14 |
.3750 | 3/8 | 9.525 | |
.3770 | V | 9.576 | |
.3860 | W | 9.804 | |
.3906 | 25/64 | 9.922 | 7/16-20 |
.3970 | X | 10.084 | |
.4040 | Y | 10.262 | 7/16-28 |
.4063 | 13/32 | 10.319 | |
.4130 | Z | 10.490 | |
.4219 | 27/64 | 10.716 | ½-13 |
.4375 | 7/16 | 11.113 | |
.4531 | 29/64 | 11.509 | ½-20 |
.4688 | 15/32 | 11.906 | ½-28 |
.4844 | 31/64 | 12.303 | 9/16-12 |
.5000 | ½ | 12.700 | 9/16-18 |
.5156 | 33/64 | 13.097 | 9/16-24 |
.5313 | 17/32 | 13.494 | 5/8-11 |
.5469 | 35/64 | 13.891 | |
.5625 | 9/16 | 14.288 | 5/8-18 |
.5781 | 37/64 | 14.684 | 5/8-24 |
.5938 | 19/32 | 15.081 | |
.6094 | 39/64 | 15.478 | 11/16-12 |
.6250 | 5/8 | 15.875 | |
.6406 | 41/64 | 16.272 | 11/16-20 11/16-24 |
.6563 | 31/32 | 16.669 | ¾-10 |
.6719 | 41/64 | 17.066 | |
.6875 | 11/16 | 17.462 | ¾-16 |
.7031 | 45/64 | 17.859 | ¾-20 |
.7188 | 23/32 | 18.256 | |
.7344 | 47/64 | 18.653 | 13/16-12 |
.7500 | ¾ | 19.050 | 13/16-16 |
.7656 | 49/64 | 19.447 | 13/16-20 7/8-9 |
.7813 | 25/32 | 19.844 | |
.7969 | 51/64 | 20.241 | 7/8-14 |
.8125 | 13/16 | 20.637 | |
.8281 | 53/64 | 21.034 | 7/8-20 |
.8138 | 27/32 | 21.431 | |
.8594 | 55/64 | 21.828 | 15/16-12 |
.8750 | 7/8 | 22.225 | 15/16-16 1.0-8 |
.8906 | 57/64 | 22.622 | 15/16-20 |
.9063 | 29/32 | 23.019 | |
.9219 | 59/64 | 23.416 | 1.0-12 |
.9375 | 15/16 | 23.813 | |
.9531 | 61/64 | 24.209 | 1.0-20 |
.9688 | 31/32 | 24.606 | |
.9844 | 63/64 | 25.003 | |
1.000 | 1 | 25.400 |
Inch Pipe Thread Taps | |||
Tap Thread Size |
Approximate |
Approximate |
Tap Drill |
1/8-27 | ¼ | 3/8 | 11/32 |
¼-18 | 3/8 | 17/32 | 7/16 |
3/8-18 | ½ | 11/16 | 37/64 |
½-14 | 5/8 | 13/16 | 23/32 |
¾-14 | 13/16 | 1 | 59/64 |
1-11 ½ | 1 1/16 | 1 5/16 | 1 - 5/32 |
1 ¼-11 ½ | 1 3/8 | 1 5/8 | 1 ½ |
1 ½-11 ½ | 1 5/8 | 1 7/8 | 1 - 47/64 |
2-11 ½ | 2 1/16 | 2 3/8 | 2 - 7/32 |
2 ½-8 | 2 9/16 | 2 7/8 | 2 - 5/8 |
Metric Taps | ||
Decimal Equivalent |
Drill Size |
Tap Size |
.0492 | 1.25 | M1.6 x 0.35 |
.0571 | 1.45 | M1.8 x 0.35 |
.0630 | 1.6 | M2 x 0.4 |
.0689 | 1.75 | M2.2 x 0.45 |
.0748 | 1.9 | M2.3 x 0.4 |
.0807 | 2.05 | M2.5 x 0.45 |
.0846 | 2.15 | M2.6 x 0.45 |
.0984 | 2.5 | M3 x 0.5 |
.1142 | 2.9 | M3.5 x 0.6 |
.1299 | 3.3 | M4 x 0.7 |
.1476 | 3.75 | M4.5 x 0.75 |
.1654 | 4.2 | M5 x 0.8 |
.1969 | 5 | M6 x 1 |
.2067 | 5.25 | M6 x 0.75 |
.2362 | 6 | M7 x 1 |
.2657 | 6.75 | M8 x 1.25 |
.2756 | 7 | M8 x 1.00 |
.3051 | 7.75 | M9 x 1.25 |
.3346 | 8.5 | M10 x 1.5 |
.3445 | 8.75 | M10 x 1.25 |
.3543 | 9 | M10 x 1.00 |
.3740 | 9.5 | M11 x 1.50 |
.3937 | 10 | M12 x 1.75 |
.4134 | 10.5 | M12 x 1.25 |
.4724 | 12 | M14 x 2 |
.4921 | 12.5 | M14 x 1.5 |
.5118 | 13 | M14 x 1.25 |
.5512 | 14 | M16 x 2 |
.5709 | 14.5 | M16 x 1.5 |
.6102 | 15.5 | M18 x 2.5 |
.6299 | 16 | M18 x 2.0 |
.6890 | 17.5 | M20 x 2.5 |
.7087 | 18 | M20 x 2.0 |
.7283 | 18.5 | M20 x 1.5 |
.7677 | 19.5 | M22 x 2.5 |
.7874 | 20 | M22 x 2.0 |
.8071 | 20.5 | M22 x 1.5 |
.8268 | 21 | M24 x 3 |
.8661 | 22 | M24 x 2 |
.8858 | 22.5 | M24 x 1.5 |
.9449 | 24 | M27 x 3 |
.9843 | 25 | M27 x 2 |
1.0433 | 26.5 | M30 x 3.5 |
1.024 | 28 | M30 x 2 |