. | UNF and UNC Tap Drill Sizes | ||||
. | Screw | 75% Tap Drill Size | Screw Major Dia | ||
. | 0 | 80 | 3/64 | 0.047 | 0.060 |
. | 1 | 64 | 53 | 0.060 | 0.073 |
. | 72 | 53 | 0.060 | ||
. | 2 | 56 | 50 | 0.070 | 0.086 |
. | 64 | 50 | 0.070 | ||
. | 3 | 48 | 47 | 0.079 | 0.099 |
. | 56 | 45 | 0.082 | ||
. | 4 | 40 | 43 | 0.089 | 0.112 |
. | 48 | 42 | 0.094 | ||
. | 5 | 40 | 38 | 0.102 | 0.125 |
. | 44 | 37 | 0.104 | ||
. | 6 | 32 | 36 | 0.107 | 0.138 |
. | 40 | 33 | 0.113 | ||
. | 8 | 32 | 29 | 0.136 | 0.164 |
. | 36 | 29 | 0.136 | ||
. | 10 | 24 | 25 | 0.150 | 0.190 |
. | 32 | 21 | 0.159 | ||
. | 12 | 24 | 16 | 0.177 | 0.216 |
. | 28 | 14 | 0.182 | ||
. | 32 | 13 | 0.185 | ||
. | 1/4 | 20 | 7 | 0.201 | 0.250 |
. | 28 | 3 | 0.213 | ||
. | 32 | 7/32 | 0.219 | ||
. | 5/16 | 18 | F | 0.257 | 0.313 |
. | 24 | I | 0.272 | ||
. | 32 | 9/32 | 0.281 | ||
. | 3/8 | 16 | 5/16 | 0.313 | 0.375 |
. | 24 | Q | 0.332 | ||
. | 32 | 11/32 | 0.344 | ||
. | 7/16 | 14 | U | 0.368 | 0.438 |
. | 20 | 25/64 | 0.391 | ||
. | 28 | Y | 0.404 | ||
. | 1/2 | 13 | 27/64 | 0.422 | 0.500 |
. | 20 | 29/64 | 0.453 | ||
. | 28 | 15/32 | 0.469 | ||
. | 9/16 | 12 | 31/64 | 0.484 | 0.563 |
. | 18 | 33/64 | 0.516 | ||
. | 24 | 33/64 | 0.516 |
. | 5/8 | 11 | 17/32 | 0.531 | 0.625 |
. | 18 | 37/64 | 0.578 | ||
. | 24 | 37/64 | 0.578 | ||
. | 11/16 | 24 | 41/64 | 0.641 | 0.688 |
. | 3/4 | 10 | 21/32 | 0.656 | 0.750 |
. | 16 | 11/16 | 0.688 | ||
. | 20 | 45/64 | 0.703 | ||
. | 13/16 | 20 | 49/64 | 0.766 | 0.813 |
. | 7/8 | 9 | 49/64 | 0.766 | 0.875 |
. | 14 | 13/16 | 0.813 | ||
. | 20 | 53/64 | 0.828 | ||
. | 15/16 | 20 | 57/64 | 0.891 | 0.938 |
. | 1 | 8 | 7/8 | 0.875 | 1.000 |
. | 12 | 15/16 | 0.938 | ||
. | 20 | 61/64 | 0.953 |