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1·The traditional design method of the crescent rib on the screw-thread steel finished product passes is very overelaborate and the results obtained based on it have some errors.

螺纹钢成品孔月牙肋的传统设计法不仅繁琐，并且据此而得出的结果有误差。

2·The influence of coverage due to the radius, angular velocity, pitch , double thread of plastic screw, and rotational mode of steel axis are also discussed in here.

文中并探讨了塑胶导螺杆半径、转速、螺距、双螺纹与钢轴旋转模式对钢珠表面检测覆盖率影响。

3·Stainless steel screw thread;

不锈钢螺丝线；

4·4 , screw thread gob produced by internation standard , material is 38chrome molybdenum aluminium azote steel , high rigidity , long time.

四螺纹口按国际标准化制造，材料选用38铬钼铝氮化钢，硬度高，使用寿命长。