
| nd Tap | O l | verall ength L | Thread length T ℓ | hread+Neck length ℓn | Shank length ℓs | Shank dia. Ds | Size of square K | Length of square ℓk | ||||
| Size TOXSTIH | Class and Ta | Code ps for Helic | Chamfer al Coil | L (inch) Wire | ℓ (inch) Screw | ℓn (inch) Threa | ℓs (inch) d Ins | Ds (inch) erts, O | K (mm) xided | ℓk (mm) | No. of flutes | Type |
| STI 1/4-20UNC | GH2 GH3 | TUU04N2NEX5 TUU04N2NEXA TUU04N3NEX5 TUU04N3NEXA | 5P 1.5P 5P 1.5P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| STI 1/4-28UNF | GH2 GH3 | TUU04K2NEX5 TUU04K2NEXA TUU04K3NEX5 TUU04K3NEXA | 5P 1.5P 5P 1.5P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| STI 5/16-18UNC | GH2 GH3 | TUU05O2NEX5 TUU05O2NEXA TUU05O3NEX5 TUU05O3NEXA | 5P 1.5P 5P 1.5P | 3.937 | 0.906 | 1.535 | 2.067 | 0.381 | 0.286 | 0.437 | 4 | 2 |
| STI 5/16-24UNF | GH2 GH3 | TUU05M2NEX5 TUU05M2NEXA TUU05M3NEX5 TUU05M3NEXA | 5P 1.5P 5P 1.5P | 3.937 | 0.906 | 1.535 | 2.028 | 0.381 | 0.286 | 0.437 | 4 | 2 |
| STI 3/8-16UNC | GH3 GH4 | TUU06P3NEX5 TUU06P3NEXA TUU06P4NEX5 TUU06P4NEXA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 4 | 3 |
| STI 3/8-24UNF | GH2 GH3 | TUU06M2NEX5 TUU06M2NEXA TUU06M3NEX5 TUU06M3NEXA | 5P 1.5P 5P 1.5P | 3.937 | 0.906 | - | 2.008 | 0.323 | 0.242 | 0.406 | 4 | 3 |
| STI 7/16-14UNC | GH3 GH4 | TUU07Q3NEX5 TUU07Q3NEXA TUU07Q4NEX5 TUU07Q4NEXA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.429 | 0.322 | 0.5 | 4 | 3 |
| STI 7/16-20UNF | GH3 GH4 | TUU07N3NEX5 TUU07N3NEXA TUU07N4NEX5 TUU07N4NEXA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.429 | 0.322 | 0.5 | 4 | 3 |
| STI 1/2-13UNC | GH3 GH4 | TUU08R3NEX5 TUU08R3NEXA TUU08R4NEX5 TUU08R4NEXA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.48 | 0.36 | 0.562 | 4 | 3 |
| STI 1/2-20UNF | GH3 GH4 | TUU08N3NEX5 TUU08N3NEXA TUU08N4NEX5 TUU08N4NEXA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.48 | 0.36 | 0.562 | 4 | 3 |