1, screw length is not good, can not accept the corresponding torque.

2, the strength of the screw, hardness is not good (Material, process and other quality reasons) can not accept the corresponding torque.

3. The force of turning screws exceeds the standard load of screws, resulting in skidding.

4, thread hole may thread screw teeth are not standard, combined with each other not tight.The primary intention of customized screw is to make the industrial products into a fixed body. In the application of the screw, the screw head is broken if the teeth cannot be closed, if the screw is locked too hard, or if the lock is not tight due to bad tooth marks, etc., the quality accuracy is the problem.

5, screw itself stop gauge more than, will also form the result of sliding teeth.

6, the outside diameter of the teeth is small, if the normal machine with a normal thread, the outside diameter of the teeth is small will slip teeth.