
■ Suitable for hard steels of 35 ~ 45HRC, such as forgings and thermal refined steels of high carbon steels and alloy steels, and die steels.
Thermal re ned steels Tool steels
35~45HRC For icon explanation, refer to P.50
Segment:1H
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | Projection (inch) | Ds (inch) | K (inch) | ℓk (inch) | No. of flutes | Type |
| For American Pipe | Threads | ||||||||||
| NPT 1/8-27 | ANSI G | Y89641 | 3P | 2.125 | 0.75 | 0.312 | 0.437 | 0.328 | 0.375 | 4 | 1 |
| NPT 1/4-18 | ANSI G | Y89643 | 3P | 2.437 | 1.062 | 0.459 | 0.562 | 0.421 | 0.437 | 4 | 1 |
| NPT 3/8-18 | ANSI G | Y89644 | 3P | 2.562 | 1.062 | 0.454 | 0.7 | 0.531 | 0.5 | 4 | 1 |
| NPT 1/2-14 | ANSI G | Y89645 | 3P | 3.125 | 1.375 | 0.579 | 0.687 | 0.515 | 0.625 | 4 | 2 |
| NPT 3/4-14 | ANSI G | Y89646 | 3P | 3.25 | 1.375 | 0.565 | 0.906 | 0.679 | 0.687 | 5 | 2 |