Spring pin, is a hollow column without a head, used for connection and fixation between the parts. This type of pins has a slightly bigger normal outer diameter than the assembly hole, and is usually made of the materials of carbon spring steel and stainless steel. Through proper combination with the matching hole by diameter, flexibility and strength, the pins can achieve the best performance. Our company participated in establishing the national standard GB/T 879.1~5-2000 for spring pins.