TPI CHART
| Diameter | UNC | UNF | 8-UN | Diameter | Course | Fine | Fine (2/3/4) |
|---|---|---|---|---|---|---|---|
| #0 | - | 80 | - | M1 | 0.25 | - | - |
| #1 | 64 | 72 | - | M1.2 | 0.25 | - | - |
| #2 | 56 | 64 | - | M1.4 | 0.3 | - | - |
| #3 | 48 | 56 | - | M1.6 | 0.35 | - | - |
| #4 | 40 | 48 | - | M1.8 | 0.35 | - | - |
| #5 | 40 | 44 | - | M2 | 0.4 | - | - |
| #6 | 32 | 40 | - | M2.5 | 0.45 | - | - |
| #8 | 32 | 36 | - | M3 | 0.5 | - | - |
| #10 | 24 | 32 | - | M3.5 | 0.6 | - | - |
| #12 | 24 | 28 | - | M4 | 0.7 | - | - |
| 1/4" | 20 | 28 | - | M5 | 0.8 | 0.9 | .75/.5 |
| 5/16" | 18 | 24 | - | M6 | 1 | 0.75 | 0.5 |
| 3/8" | 16 | 24 | - | M7 | 1 | 0.75 | 0.5 |
| 7/16" | 14 | 20 | - | M8 | 1.25 | 1 | .75/.5 |
| 1/2" | 13 | 20 | - | M10 | 1.5 | 1.25 | 1/.75 |
| 9/16" | 12 | 18 | - | M12 | 1.75 | 1.5 | 1.25/1 |
| 5/8" | 11 | 18 | - | M14 | 2 | 1.5 | 1.25/1 |
| 3/4" | 10 | 16 | - | M16 | 2 | 1.5 | 1 |
| 7/8" | 9 | 14 | - | M18 | 2.5 | 2 | 1.5/1 |
| 1" | 8 | 12 (Special) 14 (Common) | - | M20 | 2.5 | 2 | 1.5/1 |
| 1-1/8" | 7 | 12 | 8 | M22 | 2.5 | 2 | 1.5/1 |
| 1-1/4" | 7 | 12 | 8 | M24 | 3 | 2 | 1.5/1 |
| 1-3/8" | 6 | 12 | 8 | M27 | 3 | 2 | 1.5/1 |
| 1-1/2" | 6 | 12 | 8 | M30 | 3.5 | 3 | 2/1.5/1 |
| 1-3/4" | 5 | - | 8 | M33 | 3.5 | 3 | 2/1.5 |
| 2" | 4.5 | - | 8 | M36 | 4 | 3 | 2/1.5 |
| 2 -1/4" | 4.5 | - | 8 | M39 | 4 | 3 | 2/1.5 |
| 2-1/2" | 4 | - | 8 | M42 | 4.5 | 4 | 3/2/1.5 |
| 2-3/4" | 4 | - | 8 | M45 | 4.5 | 3 | - |
| 3" | 4 | - | 8 | M48 | 5 | 3 | - |
| 3-1/4" | 4 | - | 8 | M52 | 5 | 4 | - |
| 3-1/2" | 4 | - | 8 | M56 | 5.5 | 4 | - |
| 3-3/4" | 4 | - | 8 | M60 | 5.5 | 4 | - |
| 4" | 4 | - | 8 | M64 | 6 | 4 | - |