
■ 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
TYPETYPE
Segment:1B
| Size | Class | Code | Chamfer | L | ℓ | ℓn | Ds | K | ℓk | No. of | Type |
| (inch) | (inch) | (inch) | (inch) | (inch) | (inch) | flutes |
For Unified Threads
| No.4-40UNC | GH2 | Y89599 | 5P | 1.875 | 0.335 | 0.562 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.5-40UNC | GH2 | Y89601 | 5P | 1.937 | 0.374 | 0.625 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.6-32UNC | GH3 | Y89602 | 5P | 2 | 0.413 | 0.687 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.8-32UNC | GH3 | Y89604 | 5P | 2.125 | 0.453 | 0.75 | 0.168 | 0.131 | 0.25 | 3 | 1 |
| No.10-24UNC | GH3 | Y89606 | 5P | 2.375 | 0.531 | 0.875 | 0.194 | 0.152 | 0.25 | 3 | 1 |
| No.10-32UNF | GH3 | Y89607 | 5P | 2.375 | 0.531 | 0.875 | 0.194 | 0.152 | 0.25 | 3 | 1 |
| 1/4-20UNC | GH3 | Y89613 | 5P | 2.5 | 0.591 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| 1/4-28UNF | GH3 | Y89614 | 5P | 2.5 | 0.591 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| 5/16-18UNC | GH3 | Y89615 | 5P | 2.718 | 0.669 | 1.125 | 0.318 | 0.238 | 0.375 | 4 | 3 |
| 5/16-24UNF | GH3 | Y89616 | 5P | 2.718 | 0.669 | 1.125 | 0.318 | 0.238 | 0.375 | 4 | 3 |
| 3/8-16UNC | GH3 | Y89617 | 5P | 2.937 | 0.748 | 1.25 | 0.381 | 0.286 | 0.437 | 4 | 3 |
| 3/8-24UNF | GH3 | Y89618 | 5P | 2.937 | 0.748 | 1.25 | 0.381 | 0.286 | 0.437 | 4 | 3 |
| 7/16-14UNC | GH3 | Y89619 | 5P | 3.156 | 0.866 | - | 0.323 | 0.242 | 0.406 | 4 | 4 |
| 7/16-20UNF | GH3 | Y89620 | 5P | 3.156 | 0.866 | - | 0.323 | 0.242 | 0.406 | 4 | 4 |
| 1/2-13UNC | GH3 | Y89621 | 5P | 3.375 | 0.984 | - | 0.367 | 0.275 | 0.437 | 4 | 4 |
| 1/2-20UNF | GH3 | Y89622 | 5P | 3.375 | 0.984 | - | 0.367 | 0.275 | 0.437 | 4 | 4 |
| 5/8-11UNC | GH3 | Y89625 | 5P | 3.812 | 1.083 | - | 0.48 | 0.36 | 0.562 | 4 | 4 |
| 5/8-18UNF | GH3 | Y89626 | 5P | 3.812 | 1.083 | - | 0.48 | 0.36 | 0.562 | 4 | 4 |
| 3/4-10UNC | GH3 | Y89627 | 5P | 4.25 | 1.201 | - | 0.59 | 0.422 | 0.687 | 4 | 4 |
| 3/4-16UNF | GH3 | Y89628 | 5P | 4.25 | 1.201 | - | 0.59 | 0.422 | 0.687 | 4 | 4 |