
■ On parts made from comparatively soft materials, helical E coil wire thread inserts are often used in order to strengthen internal screws and increase toughness. SP STI produces threads oversize enough to accommodate helical coil wire Recommended Tapping Speed depending on Materials thread inserts.
| Brass | Brass castings | Bronze | Wrought aluminum | Aluminum alloy castings | |
| TYPE:1 | |||||
| 5〜15 | 5〜15 | 5〜15 | 5〜15 | 5〜15 | |
| (m/min) | (m/min) | (m/min) | (m/min) | (m/min) |
Magnesium alloy die castings inc alloy castings 5〜15 5〜15 (m/min) (m/min) For icon explanation, refer to P.50
Segment:1C
| Size | Class | Code | Chamfe | r L (inch) | ℓ (inch) | ℓn (inch) | ℓs (inch) | Ds (inch) | K (inch) | ℓk (inch) | No. of flutes | Type |
| For Helical Coil Wire S i | crew Thr i | ead Inserts, for i | Unified T | i hreads | ||||||||
| GH1 | SUUN2E1NEB | |||||||||||
| STI No.2-56UNC | GH2 | SUUN2E2NEB | 2P | 2.205 | 0.354 | 0.709 | 1.28 | 0.141 | 0.11 | 0.187 | 2 | 1 |
| STI No.4-40UNC | GH1 GH2 | SUUN4H1NEB SUUN4H2NEB | 2P | 2.48 | 0.512 | 0.827 | 1.496 | 0.168 | 0.131 | 0.25 | 2 | 1 |
| STI No.6-32UNC | GH1 GH2 | SUUN6J1NEB SUUN6J2NEB | 2P | 2.756 | 0.551 | 0.945 | 1.654 | 0.194 | 0.131 | 0.25 | 3 | 1 |
| STI No.8-32UNC | GH1 GH2 | SUUN8J1NEB SUUN8J2NEB | 2P | 3.15 | 0.591 | 0.984 | 1.929 | 0.220 | 0.165 | 0.281 | 3 | 1 |
| STI No.10-24UNC | GH2 GH3 | SUUNAM2NEB SUUNAM3NEB | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| STI No.10-32UNF | GH2 GH3 | SUUNAJ2NEB SUUNAJ3NEB | 2P | 3.15 | 0.591 | 1.181 | 1.713 | 0.255 | 0.191 | 0.312 | 3 | 1 |
| STI 1/4-20UNC | GH2 GH3 | SUU04N2NEB SUU04N3NEB | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| STI 1/4-28UNF | GH2 GH3 | SUU04K2NEB SUU04K3NEB | 2P | 3.543 | 0.748 | 1.378 | 1.831 | 0.318 | 0.238 | 0.375 | 3 | 2 |
| STI 5/16-18UNC | GH2 GH3 | SUU05O2NEB SUU05O3NEB | 2P | 3.937 | 0.906 | 1.535 | 2.067 | 0.381 | 0.286 | 0.437 | 3 | 2 |
| STI 5/16-24UNF | GH2 GH3 | SUU05M2NEB SUU05M3NEB | 2P | 3.937 | 0.906 | 1.535 | 2.028 | 0.381 | 0.286 | 0.437 | 3 | 2 |
| STI 3/8-16UNC | GH2 GH3 | SUU06P2NEB SUU06P3NEB | 2P | 4.331 | 1.024 | - | 2.205 | 0.367 | 0.275 | 0.437 | 3 | 3 |