1, shackle should be smooth, there are cracks and other defects are not allowed, sharp edges, combustion.
2, prohibit the use of cast iron or cast iron shackles. Buckle can be made of steel forgings, forged pin shafts.
3, no holes or welding repair shall be restricted. Permanent deformation after the button and needle should not be repaired.
4, when using, should check the buckle and latch, not excessive wear, deformation and fatigue cracks.
5, the needle must be inserted when horizontal spacing must not be applied.
6, after the correct installation, the buckle width shaft should not be lowered, the thread connection is very good.
7, use not to exceed the safety load yoke.
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