The manufacturers find it difficult to detect the steel pipes with extra deep internal threadgroove if they do not meet the relative quality standards.
内螺纹槽超深的钢管不符合相关质量标准，但生产厂却难以检测出内螺纹超深的钢管。
2
Radial distortion of the flexible component in the stop valve can be adjusted so as to ensure the joint depth between flexible screw thread trepanning circular groove and screw thread on the screw.
截止阀的柔性元件的径向变形值可以调节，保证柔性螺纹套的环槽与螺杆上的螺纹的接合深度。
3
With cars, milling, boring, drilling four automation function, can be turning sphere, cylinder, cone, thread, tapping, end face, inner and outer ring groove, etc.