The EN3155-004M1212 is a size 12 crimp-style pin contact for electrical connectors. As a military-qualified part under M39029/107-623, it is designed to terminate 12 AWG wire. Proper installation requires specific tooling, including an M81969/14-04 insertion tool, an M81969/8-10 removal tool, and an M22520/1-01 crimp tool with an M22520/1-04 positioner. This contact is intended for use in MIL-DTL-38999 Series III and IV, AS29600 Series A, and EN3645 connectors. Its robust design makes it suitable for demanding applications in the aerospace, defense, and marine industries.