
| 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 T STI Hand | Class Taps f | Code or Helical Co | Chamfer il Wire | L (inch) Screw | ℓ (inch) Thre | ℓn (inch) ad In | ℓs (inch) serts | Ds (inch) | K (mm) | ℓk (mm) | No. of flutes | Type |
| STI 1/4-20UNC | GH2 GH3 | TUU04N2NEB5 TUU04N2NEBA TUU04N3NEB5 TUU04N3NEBA | 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 | TUU04K2NEB5 TUU04K2NEBA TUU04K3NEB5 TUU04K3NEBA | 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 | TUU05O2NEB5 TUU05O2NEBA TUU05O3NEB5 TUU05O3NEBA | 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 | TUU05M2NEB5 TUU05M2NEBA TUU05M3NEB5 TUU05M3NEBA | 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 | TUU06P3NEB5 TUU06P3NEBA TUU06P4NEB5 TUU06P4NEBA | 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 | TUU06M2NEB5 TUU06M2NEBA TUU06M3NEB5 TUU06M3NEBA | 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 | TUU07Q3NEB5 TUU07Q3NEBA TUU07Q4NEB5 TUU07Q4NEBA | 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 | TUU07N3NEB5 TUU07N3NEBA TUU07N4NEB5 TUU07N4NEBA | 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 | TUU08R3NEB5 TUU08R3NEBA TUU08R4NEB5 TUU08R4NEBA | 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 | TUU08N3NEB5 TUU08N3NEBA TUU08N4NEB5 TUU08N4NEBA | 5P 1.5P 5P 1.5P | 4.331 | 1.024 | - | 2.205 | 0.48 | 0.36 | 0.562 | 4 | 3 |