規格
| 尺寸 (mm) | 標準開口大小 (mm) | SP開口不小於 (mm) |
使用範圍 | |
| 公制六角螺帽尺寸 | 英制六角螺帽尺寸 | |||
| 6" (150mm) | 20mm | 23.9mm | M1~M16 | W1/8~W1/2 |
| 8" (200mm) | 24mm | 28.6mm | M1~M18 | W1/8~W5/8 |
| 10" (250mm) | 29mm | 32.8mm | M1~M22 | W1/8~W3/4 |
| 12" (300mm) | 34mm | 38.1mm | M1~M24 | W1/8~W7/8 |
| 16" (400mm) | 43mm | 50mm | M1~M33 | W1/8~W1-1/4 |
| 20" (500mm) | 53mm | 62mm | M1~M39 | W1/8~W1-1/2 |