
Material Symbols HSS:○ HSS-Co:● HSS-P:◎
| Main size des | ignation and sp | ecification | |||
| ① metric | ② unified | ③ whitworth | ④ sewing screw | ⑤STI (metric) | ⑥STI (unified) |
| M16×2 M16×1.5 M16×1.25 M16×1 M16×0.75 | |||||
| M17×1.5 | STIM14×2 | STI9/16-18UNF | |||
| M17×1 M17×0.5 | |||||
| M17×1.5 | |||||
| M18×2.5 M18×2 M18×1.5 M18×1.25 | STIM16×1.5 | STI9/16-12UNC STI5/8-18UNF | |||
| M18×1 | STIM16×1 | ||||
| M18×0.75 M18×0.5 | |||||
| M18×2.5 M18×2 M18×1.5 M18×1.25 | |||||
| M19×2.5 M19×2 M19×1.5 | 3/4-10UNC 3/4-12UN 3/4-16UNF 3/4-20UNEF | W3/4-10 | STIM16×2 | STI5/8-11UNC | |
| M19×1 | 3/4-28UN 3/4-32UN | ||||
| M19×2.5 M19×2 M19×1.5 | |||||
| M20×2.5 M20×2 | |||||
| M20×1.5 | STIM18×1.5 | ||||
| M20×1.25 M20×1 | |||||
| M20×2.5 M20×2 M20×1.5 | |||||
| M21×1.5 | |||||
| M21×1 | |||||
| M21×1.5 |