
| Overall length | Thread length | Thread+Neck length | Shank length | Shank dia. | Size of square | Length of square | ||||||
| L | ℓ | ℓn | ℓs | Ds | K | ℓk | ||||||
| N-RZ Thre | ad Form | ing Taps for | Steels | |||||||||
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | ℓs (inch) | Ds (inch) | K (inch) | ℓk (inch) | Lobe | Type |
| 1/2-20UNF | H5 H7 | RSU08N5HEXP RSU08N5HEXB RSU08N7HEXP RSU08N7HEXB | 4P 2P 4P 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 8 | 4 |