
| Main size desi | gnation and sp | ecification | |||
| ① metric | ② unified | ③ whitworth | ④ sewing screw | ⑤STI (metric) | ⑥STI (unified) |
| M8×1.25 | 5/16-18UNC | W5/16-18 | SM9/32-20 SM5/16-18 | STIM6×1 | STI№10-24UNC STI№12-24UNC STI№12-28UNF STI1/4-20UNC STI1/4-28UNF |
| M8×1 | 1/4-20UNC 1/4-28UNF 5/16-24UNF | W1/4-20 | |||
| M8×0.75 | |||||
| M10×1.5 | 3/8-16UNC | W3/8-16 | SM11/32-28 | STIM8×1.25 | STI5/16-18UNC STI5/16-24UNF |
| M10×1.25 | |||||
| M10×1 | 3/8-24UNF | ||||
| M12×1.75 | W7/16-14 | SM7/16-16 | STIM10×1.5 | STI3/8-16UNC STI3/8-24UNF | |
| M12×1.5 | 7/16-14UNC | STIM10×1.25 | |||
| M12×1.25 | STIM10×1 | ||||
| M12×1 | 7/16-20UNF | ||||
| M12×0.75 |