
ANSI N-RZ Roll Taps for Steels
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | ℓs (inch) | Ds (inch) | K (inch) | ℓk (inch) | Lobe | TYPE |
| 1/2-13UNC | H5 | 389506M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-13UNC | H5 | 389504M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-13UNC | H7 | 389507M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-13UNC | H7 | 389505M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-20UNF | H5 | 389510M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-20UNF | H5 | 389508M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-20UNF | H7 | 389511M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
| 1/2-20UNF | H7 | 389509M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |
Number of oil grooves : Metric thread : M3〜M7 = 4, M8 = 3, M10 and larger = 4 Unified thread : No.4 and smaller = non, No.5〜1/4 = 4, 5/16〜3/8 = 3, 7/16 and larger = 4 For M6, 1/4 and smaller with 2P chamfer, the external center is cut off.