絲攻加工下孔徑選用表 |
梅華 |
NPT 英制管用螺紋 |
||
錐管內螺紋 |
|||
螺紋尺寸 |
建議孔徑 |
最大尺寸 |
最小尺寸 |
1/16x27 |
6.2 |
6.384 |
6.244 |
1/8x27 |
8.5 |
8.388 |
8.249 |
1/4x18 |
11.2 |
11.174 |
10.962 |
3/8x18 |
14.3 |
14.658 |
14.448 |
1/2x14 |
18 |
18.263 |
17.979 |
3/4x14 |
23 |
23.663 |
23.378 |
1x11.1/2 |
29 |
29.822 |
29.459 |
1.1/4x11.1/2 |
38 |
38.339 |
37.976 |
1.1/2x11.1/2 |
44 |
44.232 |
43.869 |
2x11.1/2 |
55.5 |
55.844 |
55.412 |
2.1/2x8 |
66.5 |