Patent ID: 8042236

Claim:
A plug pin of a zipper set having a pair of zipper belts and at least one zipper head, comprising: a plug pin body for inserting into the zipper head, wherein the plug pin body has an upper long surface, a lower long surface and two lateral surfaces respectively joining the upper and the lower long surfaces wherein the plug pin body has a first joint trough arranged on the lower long surface for adapting to one end of the zipper belt, wherein the plug pin body has a first concave trough arranged only on the upper long surface, wherein the plug pin body is fixed to one end of the zipper belt through punching on at least one of the lateral surfaces thereof, wherein the first concave trough provides a buffering space for compensating for the distortion effect due to the punching process, thereby avoiding interference caused by the protruding material of the punched plug pin body.