Larry D Mercer

US Patent:

45404470, Sep 10, 1985

Filed:

Jun 9, 1983

Appl. No.:

6/502740

Inventors:

Larry D. Mercer - Hewitt TX

Assignee:

Huck Manufacturing Company - Irvine CA

International Classification:

C21D 800

US Classification:

148 2

Abstract:

This disclosure relates to swage type fasteners including a pin having a plurality of combination locking and breakneck grooves and a collar adapted to be swaged into the grooves with one of the grooves acting as a breakneck whereby the excess length of pin is severed generally at the end of the collar and also relates to a method of making the pin. The multigrip pin is formed generally into its final shape and then is subject to a heat treating process to provide a desirable microstructure whereby more consistent breaks at the selected groove occurs. In one form of the invention a desirable microstructure consists of predominantly pearlite colonies with a proeutectoid ferrite matrix interspersed at the boundaries of pearlite colonies.