| 扣環 | 截面 | 孔徑 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 項目 | 標準牌號 | 單位 | 內徑 | 公差 | 厚度 | 公差 | 最大 | 公差 | 值 |
| ISTW | mm | 27.9 | 27.48~28.11 | 1.5 | 1.44~1.5 | 3.9 | ±0.1 | 2 | |
| ISTW | mm | 29.6 | 29.18~29.81 | 1.5 | 1.44~1.5 | 4 | ±0.1 | 2 | |
| ISTW | mm | 31.5 | 31~31.75 | 1.5 | 1.44~1.5 | 3.5 | ±0.1 | 2 | |
| ISTW | mm | 32.2 | 31.7~32.45 | 1.5 | 1.44~1.5 | 4.2 | ±0.1 | 2 | |
| ISTW | mm | 34.5 | 34~34.75 | 1.75 | 1.69~1.75 | 4.5 | ±0.1 | 2 | |
| ISTW | mm | 36.5 | 35.6~36.89 | 1.75 | 1.69~1.75 | 4.7 | ±0.2 | 2 | |
| ISTW | mm | 38.5 | 37.6~38.89 | 1.75 | 1.69~1.75 | 4.7 | ±0.2 | 2 | |
| ISTW | mm | 41.5 | 40.6~41.89 | 1.75 | 1.69~1.75 | 4.7 | ±0.2 | 2 | |
| ISTW | mm | 43.5 | 42.6~43.89 | 1.75 | 1.69~1.75 | 5 | ±0.2 | 2 | |
| ISTW | mm | 44.5 | 43.6~44.89 | 1.75 | 1.69~1.75 | 5.2 | ±0.2 | 2 | |
| ISTW | mm | 45.8 | 44.9~46.19 | 2 | 1.93~2 | 5.2 | ±0.2 | 2.5 | |
| ISTW | mm | 50.8 | 49.7~51.26 | 2 | 1.93~2 | 5.8 | ±0.2 | 2.5 | |
| ISTW | mm | 53.8 | 52.7~54.26 | 2 | 1.93~2 | 5.8 | ±0.2 | 2.5 | |
| ISTW | mm | 55.8 | 54.7~56.26 | 2 | 1.93~2 | 5.8 | ±0.2 | 2.5 | |
| ISTW | mm | 60.8 | 59.7~61.26 | 2.5 | 2.43~2.5 | 6 | ±0.3 | 2.5 | |