
■ ZELX NI PO STI is the spiral point tap for nickel base alloys which, with nickel as main composition, have much higher corrosion resistance and much higher heat Nitride Oxide resistance than steels, and produces threads oversize Recommended Tapping Speed depending on Materials enough to accommodate helical coil wire thread inserts. ickel base alloys
(m/min) For icon explanation, refer to P.50
Segment:1E
| Size | Class | Code | Chamfer | L (inch) | ℓ (inch) | ℓn (inch) | Ds (inch) | K (inch) | ℓk (inch) | No. of flutes | Type |
| For Helical Coil Wire S i | crew Thr i | ead Inserts, fo i | r Unified Thr | i eads | l | ||||||
| STI No.2-56UNC | GH2 | Y87200 | 4.5P | 1.875 | 0.335 | 0.562 | 0.141 | 0.11 | 0.187 | 2 | 1 |
| STI No.4-40UNC | GH1 GH2 | Y87203 Y87204 | 4.5P | 2 | 0.413 | 0.687 | 0.141 | 0.11 | 0.187 | 3 | 1 |
| STI No.6-32UNC | GH2 GH3 | Y87208 Y87224 | 4.5P | 2.375 | 0.531 | 0.875 | 0.194 | 0.152 | 0.25 | 3 | 1 |
| STI No.6-40UNF | GH2 | Y87209 | 4.5P | 2.125 | 0.453 | 0.75 | 0.168 | 0.131 | 0.25 | 3 | 1 |
| STI No.8-32UNC | GH2 GH3 | Y87210 Y87226 | 4.5P | 2.375 | 0.571 | 0.937 | 0.22 | 0.165 | 0.281 | 3 | 1 |
| STI No.10-24UNC | GH2 GH3 | Y87212 Y87228 | 4.5P | 2.5 | 0.591 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| STI No.10-32UNF | GH2 GH3 | Y87213 Y87229 | 4.5P | 2.5 | 0.591 | 1 | 0.255 | 0.191 | 0.312 | 3 | 2 |
| STI 1/4-20UNC | GH2 GH3 | Y87248 Y87258 | 4.5P | 2.718 | 0.669 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| STI 1/4-28UNF | GH2 GH3 | Y87249 Y87259 | 4.5P | 2.718 | 0.669 | 1.125 | 0.318 | 0.238 | 0.375 | 3 | 3 |
| STI 5/16-18UNC | GH3 | Y87260 | 4.5P | 2.937 | 0.748 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |
| STI 5/16-24UNF | GH2 GH3 | Y87251 Y87261 | 4.5P | 2.937 | 0.748 | 1.25 | 0.381 | 0.286 | 0.437 | 3 | 3 |