1. Screw length and specifications
The total length of the screw must be greater than 1.2 times the diameter of the screw cap.
2. Whether it has a gasket
If the screw has a gasket and the gasket is greater than the diameter of the screw cap, then the diameter of the gasket shall prevail, so that it will not flip in the feed tube. If the total length of the screw must be greater than 1.2 times the diameter of the screw cap, then the feeding method must adopt adsorption or other methods, etc.
3. Screw thread
The screw thread is different. There is a triangular thread self-tapping locking screw. It has the same pitch and angle as the metric thread, but the cross section is a triangle, with two parameters of D and C values to control the locking. The locking function can be achieved.