
| Overall length Thread length | Thread+Neck length | Shank dia. | Size of square | Length of square |
| L ℓ | ℓn | Ds | K | ℓk |
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | Ds (inch) | K (inch) | ℓk (inch) | No. of flutes | Type |
| 7/16-14UNC | GH3 | Y86520 | 2.5P | 3.937 | 0.945 | - | 0.323 | 0.242 | 0.406 | 3 | 3 |
| 1/2-13UNC | GH3 GH5 | Y86524 Y86525 | 2.5P | 4.331 | 1.142 | - | 0.367 | 0.275 | 0.437 | 3 | 3 |
| 1/2-20UNF | GH3 | Y86526 | 2.5P | 3.937 | 0.866 | - | 0.367 | 0.275 | 0.437 | 3 | 3 |