
| ral Flute | d T | ap | O l | verall ength | Thread length T | hread+Neck length | Shank length | Shank dia. | Size of square | Length of square | ||
| L | ℓ | ℓn | ℓs | Ds | K | ℓk | ||||||
| Size P STI Spiral | Class Fluted | Code Taps for Hel | Chamfer ical Coil | L (inch) Wire | ℓ (inch) Screw | ℓn (inch) Thre | ℓs (inch) ad Ins | Ds (inch) erts | K (inch) | ℓk (inch) | No. of flutes | Type |
| STI 3/8-24UNF | GH2 GH3 | SUU06M2NEB SUU06M3NEB | 2P | 3.937 | 0.906 | - | 2.008 | 0.323 | 0.242 | 0.406 | 3 | 3 |
| STI 7/16-14UNC | GH2 GH3 | SUU07Q2NEB SUU07Q3NEB | 2P | 4.331 | 1.024 | - | 2.205 | 0.429 | 0.322 | 0.5 | 3 | 3 |
| STI 7/16-20UNF | GH2 GH3 | SUU07N2NEB SUU07N3NEB | 2P | 4.331 | 1.024 | - | 2.205 | 0.429 | 0.322 | 0.5 | 3 | 3 |
| STI 1/2-13UNC | GH2 GH3 | SUU08R2NEB SUU08R3NEB | 2P | 4.331 | 1.024 | - | 2.205 | 0.480 | 0.36 | 0.562 | 3 | 3 |
| STI 1/2-20UNF | GH2 GH3 | SUU08N2NEB SUU08N3NEB | 2P | 4.331 | 1.024 | - | 2.205 | 0.480 | 0.36 | 0.562 | 3 | 3 |