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上海吉都国际贸易有限公司
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上海市松江区茸梅路345号3栋
The parallel, internal thread National Pipe Straight Fuel is coupled with tapered, external National Pipe Taper without use of a sealant.
The flank angle is 60°
| Nominal Diameter | Major Diameter | Tapping | TPI | Pitch |
| mm | Drill Size | mm | ||
| mm | ||||
| 1/16" - 27 NPSF | 7.582 | 6.304 | 27 | 0.940 |
| 1/8" - 27 NPSF | 9.929 | 8.651 | 27 | 0.940 |
| 1/4" - 18 NPSF | 13.236 | 11.232 | 18 | 1.411 |
| 3/8" - 18 NPSF | 16.673 | 14.671 | 18 | 1.411 |
| 1/2" - 14 NPSF | 20.819 | 18.118 | 14 | 1.814 |
| 3/4" - 14 NPSF | 26.166 | 23.465 | 14 | 1.814 |
| 1" - 11 1/2 NPSF | 32.718 | 29.464 | 11.5 | 2.209 |
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