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How To Distinguish Barrel And Screw

Barrel: if you look at the cylinder, it is difficult to distinguish, only through the front and back part of the connection and what, and screw contrast (length, gap, etc.) to see.


Screw: the head with a backstop ring, film blowing machine, the head does not stop ring, rubber machine screw deep spiral groove, screw relative to the spiral groove is very narrow.