片语
straight pipe thread直管螺纹
dryseal straight pipe thread气密直管螺纹
straight thread plug直螺纹螺塞
straight internal thread直内螺纹
uniform strength straight thread等强直螺纹
straight screw thread connection直螺纹连接
peel rolled straight thread剥肋滚压直螺纹
straight thread conjunction直螺纹连接