Pogo Pins Spring Loaded Contacts Harwin Pogo Pin Spring Loaded Contacts consist of the Individual SMT Pogo Pin, Pogo Pin with Location Peg, and the undercut for retention in moldings. These spring-loaded contacts feature 1.03 to 1.5mm diameter barrels and 2.4 to 8.2mm heights. Harwin Pogo Pins mate with any contact surface or SMT Contact Pads S70 series.