Cotter Pin vs. Clevis Pin
These are companions, not rivals: the clevis pin carries the load, and the cotter pin keeps it in place.
| Feature | Cotter Pin | Clevis Pin |
|---|---|---|
| Function | Retainer | Load-bearing pivot pin |
| Carries load? | No | Yes (shear) |
| Shape | Doubled wire, bent legs | Headed, unthreaded, cross-hole |
| Used with | Clevis pins, castle nuts | Clevis, linkages, hitches |
| Reusable | Not reliably | Yes |
Verdict
You rarely choose between them — you use both together. Pick the clevis pin for the load and the right-size cotter pin to retain it.