US Machine Screws - Dimensions
Machine screw diameters
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| US Machine Screws | ||||
|---|---|---|---|---|
| Size no. | Thread Diameter | TPI | ||
| Decimal (in) | Nearest Fractional (in) | Fine | Coarse | |
| 0 | 0.0600 | 1/16 | 80 | |
| 1 | 0.0730 | 5/64 | 72 | 64 |
| 2 | 0.0860 | 3/32 | 64 | 56 |
| 3 | 0.0990 | 7/64 | 56 | 48 |
| 4 | 0.1120 | 7/64 | 48 | 40 |
| 5 | 0.1250 | 1/8 | 44 | 40 |
| 6 | 0.1380 | 9/64 | 40 | 32 |
| 8 | 0.1640 | 5/32 | 36 | 32 |
| 10 | 0.1900 | 3/16 | 32 | 24 |
| 12 | 0.2160 | 7/32 | 28 | 24 |
| 1/4 | 0.2500 | 1/4 | 28 | 20 |
| 5/16 | 0.3125 | 5/16 | 24 | 18 |
| 3/8 | 0.3750 | 3/8 | 24 | 16 |
- TPI = threads per inch
- threads according UNF – Unified National Fine Thread
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