UNC Unified National Coarse
ANSI thread - 60° profile
| Size | TPI | Pitch in | Ext Major in | Int Minor in | Tap Drill Size in | Tap Drill Size mm |
|---|---|---|---|---|---|---|
| #1 | 64 | 0.0156 | 0.0730 | 0.0561 | #53 | 1.5 |
| #2 | 56 | 0.0179 | 0.0860 | 0.0667 | #50 | 1.8 |
| #3 | 48 | 0.0208 | 0.0990 | 0.0764 | #47 | 2.1 |
| #4 | 40 | 0.0250 | 0.1120 | 0.0849 | #43 | 2.4 |
| #5 | 40 | 0.0250 | 0.1250 | 0.0979 | #38 | 2.7 |
| #6 | 32 | 0.0313 | 0.1380 | 0.1042 | #36 | 2.9 |
| #8 | 32 | 0.0313 | 0.1640 | 0.1302 | #29 | 3.5 |
| #10 | 24 | 0.0417 | 0.1900 | 0.1449 | #25 | 4.0 |
| #12 | 24 | 0.0417 | 0.2160 | 0.1709 | #16 | 4.7 |
| 1/4" | 20 | 0.0500 | 0.2500 | 0.1959 | #7 | 5.4 |
| 5/16" | 18 | 0.0556 | 0.3125 | 0.2524 | F | 6.8 |
| 3/8" | 16 | 0.0625 | 0.3750 | 0.3073 | O | 8.3 |
| 7/16" | 14 | 0.0714 | 0.4375 | 0.3602 | U | 9.7 |
| 1/2" | 13 | 0.0769 | 0.5000 | 0.4167 | 27/64" | 11.2 |
| 9/16" | 12 | 0.0833 | 0.5625 | 0.4723 | 31/64" | 12.3 |
| 5/8" | 11 | 0.0909 | 0.6250 | 0.5266 | 17/32" | 13.5 |
| 3/4" | 10 | 0.1000 | 0.7500 | 0.6417 | 21/32" | 16.7 |
| 7/8" | 9 | 0.1111 | 0.8750 | 0.7547 | 49/64" | 19.4 |
| 1" | 8 | 0.1250 | 1.0000 | 0.8647 | 7/8" | 22.2 |
| 1 1/8" | 7 | 0.1250 | 1.1250 | 0.9704 | 63/64" | 25.4 |
| 1 1/4" | 7 | 0.1250 | 1.2500 | 1.0954 | 1 7/64" | 28.6 |
| 1 3/8" | 6 | 0.1667 | 1.3750 | 1.1946 | 1 7/32" | 31.0 |
| 1 1/2" | 6 | 0.1667 | 1.5000 | 1.3196 | 1 11/32" | 34.1 |
| 1 3/4" | 5 | 0.2000 | 1.7500 | 1.5335 | 1 9/16" | 39.7 |
| 2" | 4.5 | 0.2222 | 2.0000 | 1.7594 | 1 25/32" | 45.2 |
| 2 1/4" | 4.5 | 0.2222 | 2.2500 | 2.0094 | 2 1/32" | 51.6 |
| 2 1/2" | 4 | 0.2500 | 2.5000 | 2.2294 | 2 1/4" | 57.2 |
| 2 3/4" | 4 | 0.2500 | 2.7500 | 2.4794 | 2 1/2" | 63.5 |
| 3" | 4 | 0.2500 | 3.0000 | 2.7294 | 2 3/4" | 69.9 |
| 3 1/4" | 4 | 0.2500 | 3.2500 | 2.9794 | 3" | 76.2 |
| 3 1/2" | 4 | 0.2500 | 3.5000 | 3.2294 | 3 1/4" | 82.6 |
| 3 3/4" | 4 | 0.2500 | 3.7500 | 3.4794 | 3 1/2" | 88.9 |
| 4" | 4 | 0.2500 | 4.0000 | 3.7294 | 3 3/4" | 95.3 |