U Type Cotter pin

The split pin is likely one of the oldest methods of anti-loosening. No thread adhesive, no complex structure—just a metal wire folded in half, inserted into the hole, and bent open on both ends. Done. Simple enough that you can't think of a cheaper way.

The principle is straightforward: Insert the split pin into the hole of the corresponding bolt or shaft end, then bend the exposed two legs outward and press them tightly against the bolt end or shaft surface. At this point, the split pin acts as a physical stopper, preventing the nut from being removed and stopping the shaft components from slipping out.

Product Feature

Good elasticity, can withstand repeated bending: The wire has undergone heat treatment, resulting in moderate elasticity. When assembling, break it open, and when disassembling, straighten it straight. The same split pin will not break even after several uses. Too hard to break, too soft to break once, our hardness control is just right.

The round head is neat and the socket is not stuck: the semi-circular head is formed in one go, with a smooth curvature. When inserting into the pin hole, it slides smoothly to the bottom without getting stuck in the hole. Some open-end sales on the market have twisted heads that cannot be inserted halfway.

Accurate size, diameter not exceeding tolerance: The deviation between the nominal diameter and the actual wire diameter is controlled within 0.05mm. The diameter of the pin hole is fixed, and a slightly thicker open-end pin cannot be inserted. We randomly inspect the outer diameter of each batch to ensure smooth insertion.

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