
■Spiralflutedtapapplicableforsuchhighspeed Coating tapping as 15m/min to 25m/min. Under low tappingspeed,poorchipshapeandpoorchip ejectionmayoccurandcausetappingtroubles.
Low carbon steels Medium carbon steels
(m/min) (m/min)
Segment:1D
| Size | Class | Code | Chamfer | L | ℓ | ℓn | Ds | K | ℓk | No.�of l | TYPE |
| (inch) | (inch) | (inch) | (inch) | (inch) | (inch) | flutes | |||||
| F�i� | or�Unifie� | �id�Thread | �i�s | ||||||||
| No.4-40UNC | GH2 | Y84401 | 2.5P | 1.875 | 0.236 | 0.562 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.5-40UNC | GH2 | Y84403 | 2.5P | 1.937 | 0.236 | 0.625 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.6-32UNC | GH3 | Y84405 | 2.5P | 2 | 0.276 | 0.687 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| No.8-32UNC | GH3 | Y84407 | 2.5P | 2.125 | 0.276 | 0.75 | 0.168 | 0.131 | 0.25 | 3 | 1 |
| No.10-24UNC | GH3 | Y84409 | 2.5P | 2.375 | 0.354 | 0.875 | 0.194 | 0.152 | 0.25 | 3 | 1 |
| No.10-32UNF | GH3 | Y84410 | 2.5P | 2.375 | 0.276 | 0.875 | 0.194 | 0.152 | 0.25 | 3 | 1 |
| 1/4-20UNC | GH3 | Y84413 | 2.5P | 2.5 | 0.433 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| 1/4-28UNF | GH3 | Y84414 | 2.5P | 2.5 | 0.354 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| 5/16-18UNC | GH3 | Y84415 | 2.5P | 2.718 | 0.472 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| 5/16-24UNF | GH3 | Y84416 | 2.5P | 2.718 | 0.394 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| 3/8-16UNC | GH3 | Y84417 | 2.5P | 2.937 | 0.551 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |
| 3/8-24UNF | GH3 | Y84418 | 2.5P | 2.937 | 0.394 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |
| 7/16-14UNC | GH3 | Y84419 | 2.5P | 3.156 | 0.591 | - | 0.323 | 0.242 | 0.406 | 3 | 4 |
| 7/16-20UNF | GH3 | Y84420 | 2.5P | 3.156 | 0.472 | - | 0.323 | 0.242 | 0.406 | 3 | 4 |
| 1/2-13UNC | GH3 | Y84421 | 2.5P | 3.375 | 0.63 | - | 0.367 | 0.275 | 0.437 | 3 | 4 |
| 1/2-20UNF | GH3 | Y84422 | 2.5P | 3.375 | 0.472 | - | 0.367 | 0.275 | 0.437 | 3 | 4 |
| 5/8-11UNC | GH3 | Y84425 | 2.5P | 3.812 | 0.748 | - | 0.48 | 0.36 | 0.562 | 3 | 4 |