
| Overa lengt | ll h Thread length | Thread+Nec length | k Shank dia. | Size of square | Length of square | ||||||
| L | ℓ | ℓn | Ds | K | ℓk | ||||||
| ELX NI SP S | TI Spi | ral Fluted Ta | ps for Nicke | l Base | Alloys, f | or Helica | lCoilW | ire Scre | w Threa | N f d Inserts | |
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | Ds (inch) | K (inch) | ℓk (inch) | o. o flutes | Type |
| STI 1/4-20UNC | GH2 GH3 | Y87448 Y87458 Y87058 | 3P 1.5P | 2.718 | 0.472 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| STI 1/4-28UNF | GH2 GH3 | Y87449 Y87459 | 3P | 2.718 | 0.394 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| STI 5/16-18UNC | GH3 GH4 | Y87460 Y87470 | 3P | 2.937 | 0.551 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |
| STI 5/16-24UNF | GH2 GH3 | Y87451 Y87461 Y87061 | 3P 1.5P | 2.937 | 0.394 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |
| STI 3/8-16UNC | GH3 GH4 | Y87462 Y87472 | 3P | 3.375 | 0.630 | - | 0.367 | 0.275 | 0.437 | 3 | 4 |
| STI 3/8-24UNF | GH2 GH3 | Y87453 Y87063 Y87463 | 3P 1.5P 3P | 3.156 | 0.472 | - | 0.323 | 0.242 | 0.406 | 3 | 4 |
| STI 7/16-14UNC | GH3 | Y87464 | 3P | 3.593 | 0.709 | - | 0.429 | 0.322 | 0.5 | 3 | 4 |
| STI 7/16-20UNF | GH3 GH4 | Y87465 Y87475 | 3P | 3.375 | 0.472 | - | 0.367 | 0.275 | 0.437 | 3 | 4 |
| STI 1/2-13UNC | GH3 | Y87466 | 3P | 3.812 | 0.748 | - | 0.480 | 0.36 | 0.562 | 3 | 4 |
| STI 1/2-20UNF | GH3 | Y87467 Y87067 | 3P 1.5P | 3.593 | 0.512 | - | 0.429 | 0.322 | 0.5 | 3 | 4 |