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Do you know the quality defects of the screw ?

Screws in the production process, often because of machine problems or staff negligence caused a variety of quality defects, we often share the screws often encountered quality problems.
1. Screw head deformation, playing crooked head. The possible reason is a bad punch screw installation and improper transfer machine.
2. The head of the screw is not round. The reason is that the choice of a die for a screw die is not adequate or a punch is not full enough.
3 screws have burrs or burrs. The reason is a red molding bad, mainly between punch and die hole clearance is too large or too short punch                 caused.
4 screw head cracking, screw head cracks.

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