A type of screw and nut with coarse pitch was applied to realize thread core demoulding automatically.
采用螺距粗的螺丝和螺母实现螺纹型芯自动脱模。
2
Compression cancellous bone screw with both ends thread is a Variable pitch screw designed tO provide rigid 'fixation of cancellous bone fracture.
双端螺纹松质骨加压螺钉的特点是两端螺纹具有不同的螺距，无螺帽。
3
The influence of coverage due to the radius, angular velocity, pitch , double threadof plastic screw, and rotational mode of steel axis are also discussed in here.