Thread Table
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PITCH (MM)
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THREADS PER INCH (TPI)
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Size |
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Coarse | Fine | Extra Fine | UNC | UNF | BSW | BSF |
| M1.6 | - | #0 | 0.35 | - | - | - | 80 | - | - |
| M2 | - | #1 | 0.4 | - | - | - | 72 | - | - |
| - | - | #2 | - | - | - | 56 | 64 | - | - |
| M2.5 | - | #3 | 0.45 | - | - | 48 | 56 | - | - |
| - | - | #4 | - | - | - | 40 | 48 | - | - |
| M3 | 1/8" | #5 | 0.5 | - | - | 40 | 44 | 40 | - |
| M3.5 | - | #6 | 0.6 | - | - | 32 | 40 | - | - |
| M4 | - | #8 | 0.7 | - | - | 32 | 36 | - | - |
| M5 | 3/16" | #10 | 0.8 | - | - | 24 | 32 | 24 | 32 |
| - | - | #12 | - | - | - | 24 | 28 | - | - |
| M6 | 1/4" | - | 1 | - | - | 20 | 28 | 20 | 26 |
| M8 | 5/16" | - | 1.25 | 1 | - | 18 | 24 | 18 | 22 |
| M10 | 3/8" | - | 1.5 | 1.25 | 1 | 16 | 24 | 16 | 20 |
| - | 7/16" | - | - | - | - | 14 | 20 | 14 | 18 |
| M12 | 1/2" | - | 1.75 | 1.5 | 1.25 | 13 | 20 | 12 | 16 |
| M14 | 9/16" | - | 2 | 1.5 | - | 12 | 18 | 12 | 16 |
| M16 | 5/8" | - | 2 | 1.5 | - | 11 | 18 | 11 | 14 |
| M18 | - | - | 2.5 | 1.5 | - | - | - | - | - |
| M20 | 3/4" | - | 2.5 | 1.5 | - | 10 | 16 | 10 | 12 |
| M22 | 7/8" | - | 2.5 | 1.5 | - | 9 | 14 | 9 | 11 |
| M24 | 1" | - | 3 | 2 | - | 8 | 12 (14) | 8 | 10 |