
■ On parts made from comparatively soft materials, helical coil wire thread inserts are often used in order to strengthen internal screws Oxide and increase toughness. SP OX STI produces Recommended Tapping Speed depending on Materials threads oversize enough to accommodate helical coil wire thread inserts. Low carbon steels Medium carbon steels
(m/min) (m/min)
Segment:1C
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | ℓs (inch) | Ds (inch) | K (inch) | ℓk (inch) | No. of flutes | TYPE |
| For i | Unified | i Thread | i s | l | ||||||||
| No.2-56UNC | GH1 | SUUN2E1NEX | 2P | 2.205 | 0.354 | 0.709 | 1.28 | 0.141 | 0.11 | 0.187 | 2 | 1 |
| No.2-56UNC | GH2 | SUUN2E2NEX | 2P | 2.205 | 0.354 | 0.709 | 1.28 | 0.141 | 0.11 | 0.187 | 2 | 1 |
| No.4-40UNC | GH1 | SUUN4H1NEX | 2P | 2.48 | 0.512 | 0.827 | 1.496 | 0.168 | 0.131 | 0.25 | 2 | 1 |
| No.4-40UNC | GH2 | SUUN4H2NEX | 2P | 2.48 | 0.512 | 0.827 | 1.496 | 0.168 | 0.131 | 0.25 | 2 | 1 |
| No.6-32UNC | GH1 | SUUN6J1NEX | 2P | 2.756 | 0.551 | 0.945 | 1.654 | 0.194 | 0.131 | 0.25 | 3 | 1 |
| No.6-32UNC | GH2 | SUUN6J2NEX | 2P | 2.756 | 0.551 | 0.945 | 1.654 | 0.194 | 0.131 | 0.25 | 3 | 1 |
| No.8-32UNC | GH1 | SUUN8J1NEX | 2P | 3.15 | 0.591 | 0.984 | 1.929 | 0.22 | 0.165 | 0.281 | 3 | 1 |
| No.8-32UNC | GH2 | SUUN8J2NEX | 2P | 3.15 | 0.591 | 0.984 | 1.929 | 0.22 | 0.165 | 0.281 | 3 | 1 |
| No.10-24UNC | GH2 | SUUNAM2NEX | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| No.10-24UNC | GH3 | SUUNAM3NEX | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| No.10-32UNF | GH2 | SUUNAJ2NEX | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| No.10-32UNF | GH3 | SUUNAJ3NEX | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| 1/4-20UNC | GH2 | SUU04N2NEX | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| 1/4-20UNC | GH3 | SUU04N3NEX | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| 1/4-28UNF | GH2 | SUU04K2NEX | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| 1/4-28UNF | GH3 | SUU04K3NEX | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| 5/16-18UNC | GH2 | SUU05O2NEX | 2P | 3.937 | 0.906 | 1.535 | 2.067 | 0.381 | 0.286 | 0.437 | 3 | 2 |