0951 Spring-loaded Pin Connector Mill-Max 0951 Spring-loaded Pin Connector is a high profile, standard stroke, surface mount pin with 20µ' Gold-over-Nickel plating and 10µ' Gold-over-Nickel contact plating. The RoHS compliant Mill-Max 0951 Spring-loaded Pin's shell material is a Brass alloy shell material (UNS C36000) per ASTM B 16.