A metal cotter pin with two arms passed through a hole, held in place by the springing apart of the arms.
开尾销，开口销
Example sentencesExamples
It was only sealed with a split pin so she opened the envelope and pulled out the documents.
The split pin was wrenched out by nitrogen-crazed river weed and there you are.
Two of the design features of the Mills bomb are still to be found in many modern hand grenades - the split pin and the handle which secures the spring-loaded firing pin.