AMPLIMITE D-Sub Connector HD-20 Series 20 DF COSI Snap-In Crimp Contacts AMPLIMITE 20 DF COSI snap-in crimp contacts for HD-20 Series cable mount d-sub connectors. The 20 DF COSI snap-in crimp pin contacts are made from brass with a 0.76μm gold plating, the 20 DF COSI snap-in crimp socket contacts are made from phosphor bronze with a 0.76μm gold plating.