One of the index test pull head lock function on the chain belt is self-locking pull head strength index which is a minimum.
Asked to pull the head is installed on the chain belt, exerting certain pulling force on the chain belt, pull head remain locked in a chain, no slippage. A numerical force applied on the chain belt is standard. Pull head self-locking force is the pull heads in clothing should have an important function, in order to improve the zipper using the reliability, in the new standa
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