1, the cotter pin should not be broken, cracked, rust and other phenomena

2, the nominal specification of the cotter pin should be equal to the diameter of the cotter pin hole

3, it should be split tight by the root, so that the cotter pin will not move

4, the coatpin opening must be symmetrical, the two feet must be rolled on the round pin or shaft after splitting, so that the arc surface of the split part is parallel to the circular pin or shaft, and as close as possible to the round pin or shaft, so that the Angle of the two openings is >180°

5, it is strictly prohibited to use wire or other materials instead of cotter pin