1, shackle should be smooth, do not allow cracks and other defects, sharp edge, burning.

2, prohibit the use of cast iron or cast steel shackles.The buckles can be made of steel forgings, forged and machined shaft pins.

3. No drilling or welding repair should be hampered.Buttons and pins should not be repaired after permanent deformation.

4, when using, should check the buckle and latch, not excessive wear, deformation and fatigue crack.

5. The needle must be inserted when horizontal spacing must not be used to pull the needle.

6, after the correct installation, the buckle width of the shaft should not be reduced in the body, the connection of the thread is very good.

7, use shall not exceed the safety load of shackles.