In many need to slide riveting occasions, due to the rivet length is not consistent, the assembly of riveting caused by inconsistent tightness, in the final analysis in addition to the riveting machine accuracy, there is a major factor is the rivet accuracy.If the rivet can achieve as high and low,For example within 0.02mm.Then the tolerance after the riveting can be generally controlled around 0.02mm.But most of the rivets on market using common cold heading process molding, tens of thousands of large quantities of rivet production could not meet the accuracy requirements, TAGEER after a hard efforts about a year , finally by improving the structure of cold heading machine and the technological requirements, making tens of thousands of rivet can achieve unity accuracy requirement, hereinafter referred to as contour rivet.