
| 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-RS Roll Taps for Non-Ferrous Materials ANSI
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | ℓs (inch) | Ds (inch) | K (inch) | ℓk (inch) | Lobe | TYPE |
| 7/16-20UNF | H7 | 388499M | 2P | 3.937 | 0.906 | - | 2.008 | 0.323 | 0.242 | 0.406 | 6 | 4 |
| 1/2-13UNC | H5 | 388506M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-13UNC | H5 | 388504M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-13UNC | H7 | 388507M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-13UNC | H7 | 388505M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-20UNF | H5 | 388510M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-20UNF | H5 | 388508M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-20UNF | H7 | 388511M | 4P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
| 1/2-20UNF | H7 | 388509M | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 6 | 4 |
Number of oil grooves : Metric thread : =1 Unified thread : No.4 and smaller=non, No.5 and larger=1 For M6, 1/4 and smaller, external centers of 2P chamfer taps are removed.