
| Main size desi | gnation and sp | ecification | |||
| ① metric | ② unified | ③ whitworth | ④ sewing screw | ⑤STI (metric) | ⑥STI (unified) |
| M2×0.4 | №1-64UNC №1-72UNF | SM5/64-64 | |||
| M2×0.25 | |||||
| M2.2×0.45 | №2-56UNC №2-64UNF | ||||
| M2.2×0.25 | |||||
| M2.3×0.4 | |||||
| M2.3×0.25 | |||||
| M2.5×0.45 | W3/32-48 | SM3/32-56 | |||
| M2.5×0.35 | SM3/32-100 | ||||
| M2.6×0.45 | №3-48UNC №3-56UNF | ||||
| M2.6×0.35 | |||||
| M3×0.5 M3×0.35 | №4-40UNC №4-48UNF | STIM2×0.4 STIM2.2×0.45 | STI№2-56UNC | ||
| M3.5×0.6 | №5-40UNC №5-44UNF №6-32UNC №6-40UNF | W1/8-40 | SM1/8-40 SM1/8-44 | STIM2.5×0.45 STIM2.6×0.45 | |
| M3.5×0.35 | |||||
| M4×0.7 | W5/32-32 | SM9/64-40 | STIM3×0.5 | STI№4-40UNC STI№5-40UNC | |
| M4×0.5 | |||||
| M4.5×0.75 | №8-32UNC №8-36UNF | SM11/64-40 | STIM3.5×0.6 | STI№6-40UNF | |
| M4.5×0.5 | |||||
| M5×0.8 | №10-24UNC №10-32UNF | W3/16-24 | SM3/16-24 SM3/16-28 | STIM4×0.7 | STI№6-32UNC |
| M5×0.75 | SM3/16-32 | ||||
| M5×0.5 | |||||
| M6×1 | №12-24UNC №12-28UNF | W7/32-24 | SM15/64-28 | STIM4.5×0.75 STIM5×0.8 | STI№8-32UNC STI№8-36UNF STI№10-32UNF |
| M6×0.75 M6×0.5 | SM7/32-32 |