Tap and Drill Sizes
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TAP DRILL SIZES
| |||||||
|---|---|---|---|---|---|---|---|
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TAP SIZE | PITHCH | TAP DRILL
SIZE (75%) | TAP
SIZE | PITHCH |
TAP DRILL SIZE (75%) | ||
| 0 | 80 | NF | 3/64" | 3/4" | 16 | NF | 11/16" |
| 1 | 64 | NC | 53 | 7/8" | 9 | NC | 49/64" |
| 1 | 72 | NF | 53 | 7/8" | 14 | NF | 13/16" |
| 2 | 56 | NC | 50 | 1" | 8 | NC | 7/8" |
| 2 | 64 | NF | 50 | 1" | 12 | NF | 59/64" |
| 3 | 48 | NC | 47 | 1" | 14 | NS | 15/16" |
| 3 | 56 | NF | 45 | 1-1/8" | 7 | NC | 63/64" |
| 4 | 40 | NC | 43 | 1-1/8" | 12 | NF | 1-3/64" |
| 4 | 48 | NF | 42 | 1-1/4" | 7 | NC | 1-7/64" |
| 5 | 40 | NC | 38 | 1-1/4" | 12 | NF | 1-11/64" |
| 5 | 44 | NF | 37 | 1-1/2" | 6 | NC | 1-11/32" |
| 6 | 32 | NC | 36 | 1-1/2" | 12 | NF | 1-27/64" |
| 6 | 40 | NF | 33 | 1-3/4" | 5 | NC | 1-9/16" |
| 8 | 32 | NC | 29 | 2" | 4-1/2" | NC | 1-25/32" |
| 8 | 36 | NF | 29 | 1/8" | 27 | NPSC | 11/32" |
| 10 | 24 | NC | 25 | 1/4" | 18 | NPSC | 7/16" |
| 10 | 32 | NF | 21 | 3/8" | 18 | NPSC | 37/64" |
| 12 | 24 | NC | 16 | 1/2" | 14 | NPSC | 23/32" |
| 12 | 28 | NF | 14 | 3/4" | 14 | NPSC | 59/64" |
| 1/4" | 20 | NC | 7 | 1" | 11-1/2" | NPSC | 1-5/32" |
| 1/4" | 28 | NF | 3 | 1-1/4" | 11-1/2" | NPSC | 1-1/2" |
| 5/16" | 18 | NC | F | 1-1/2" | 11-1/2" | NPSC | 1-3/4" |
| 5/16" | 24 | NF | I | 2" | 11/12" | NPSC | 2-7/32" |
| 3/8" | 16 | NC | 5/16 | 1/16" | 27 | NPT/NPTF | C |
| 3/8" | 24 | NF | Q | 1/8" | 27 | NPT/NPTF | Q |
| 7/16 | 14 | NC | U | 1/4" | 18 | NPT/NPTF | 7/16" |
| 7/16 | 20 | NF | 25/64 | 3/8" | 18 | NPT/NPTF | 9/16" |
| 1/2" | 13 | NC | 27/64 | 1/2" | 14 | NPT/NPTF | 45/64" |
| 1/2" | 20 | NF | 29/64 | 3/4" | 14 | NPT/NPTF | 29/32" |
| 9/16" | 12 | NC | 31/64 | 1" | 11-1/2" | NPT/NPTF | 1-9/64" |
| 9/16" | 18 | NF | 33/64 | 1-1/4" | 11-1/2" | NPT/NPTF | 1-31/64" |
| 5/8" | 11 | NC | 37/64 | 1-1/2" | 11-1/2" | NPT/NPTF | 1-23/32" |
| 5/8" | 18 | NF | 9/16 | 2" | 11-1/2" | NPT/NPTF | 2-3/16" |
| 11/16" | 11 | NS | 19/32 | ||||
| 11/16" | 16 | NS | 5/8 | ||||
| 3/4" | 10 | NC | 21/32 | ||||