643425-1 is a socket header assembly component for the 5.0 mm Power Key Connectors (5.0 PKC) wire-to-board connector system designed for power circuits in home appliances, particularly gas appliances. This connector features a compact design with a 19.4 mm mated height and 5.0 mm contact centerline spacing, providing reliable power distribution in demanding applications. The assembly incorporates pre-tinned socket finish with duplex configuration, UL94V-2 flammability rating, and is designed to mate with plug housing pin contacts for 6-circuit configurations at 0.550 inch (13.97 mm) A dimension. The connector includes protective design features such as locking levers surrounded by walls to prevent tangling with wires, double lock plates for complete contact loading, and bubble-release design for potted applications. This product is recognized under UL Component Program (File No. E28476) and certified by Canadian Standards Association (File No. LR7189), making it suitable for safety-critical power distribution in residential and commercial appliance systems.