| 扣環 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 項目 | 標準牌號 | 單位 | 外徑 | 公差 | 內徑 | 公差 | 厚度 | 公差 |
| ETW | inch | 0.177 | 0.170~0.185 | 0.075 | 0.072~0.074 | 0.016 | 0.015~0.016 | |
| ETW | inch | 0.197 | 0.189~0.204 | 0.079 | 0.076~0.078 | 0.016 | 0.015~0.016 | |
| ETW | inch | 0.236 | 0.229~0.244 | 0.091 | 0.088~0.090 | 0.016 | 0.015~0.016 | |
| ETW | inch | 0.236 | 0.229~0.244 | 0.098 | 0.095~0.098 | 0.016 | 0.015~0.016 | |
| ETW | inch | 0.276 | 0.268~0.283 | 0.118 | 0.115~0.118 | 0.024 | 0.023~0.025 | |
| ETW | inch | 0.276 | 0.268~0.283 | 0.126 | 0.122~0.125 | 0.024 | 0.023~0.025 | |
| ETW | inch | 0.315 | 0.308~0.322 | 0.138 | 0.134~0.137 | 0.024 | 0.023~0.025 | |
| ETW | inch | 0.354 | 0.347~0.362 | 0.157 | 0.153~0.157 | 0.024 | 0.023~0.025 | |
| ETW | inch | 0.433 | 0.426~0.440 | 0.197 | 0.193~0.196 | 0.024 | 0.023~0.025 | |
| ETW | inch | 0.472 | 0.465~0.480 | 0.236 | 0.232~0.236 | 0.031 | 0.030~0.033 | |
| ETW | inch | 0.551 | 0.544~0.559 | 0.276 | 0.270~0.275 | 0.031 | 0.030~0.033 | |
| ETW | inch | 0.63 | 0.623~0.637 | 0.315 | 0.310~0.314 | 0.031 | 0.030~0.033 | |
| ETW | inch | 0.709 | 0.701~0.716 | 0.354 | 0.349~0.354 | 0.031 | 0.030~0.033 | |
| ETW | inch | 0.787 | 0.776~0.799 | 0.394 | 0.388~0.393 | 0.039 | 0.038~0.041 | |
| ETW | inch | 0.906 | 0.894~0.917 | 0.472 | 0.466~0.472 | 0.039 | 0.038~0.041 | |