生产定制金属变径环缩径环扩径环
M631.5
M401.5
14
14
70
5


M63-M50
M631.5
M501.5
14
14
70
5


英制螺纹


G3/8-G1/4
G3/8
G1/4
6
8.5
18
50


G1/2-G3/8
G1/2
G3/8
6.5