643424-1 is a polarized socket header connector designed for 5.0 mm Power Key Connectors (5.0 PKC) wire-to-board power circuit applications. This 6-circuit matrix configuration socket header features a standard tail length of 0.175 inches (4.45 mm) and is rated UL94V-0 for flammability. The connector is finished with pre-tin plating and duplex finish (gold plating in mating area with matte tin on solder tail over nickel underplate), ensuring reliable electrical contact and corrosion resistance. The A dimension is 0.550 inches (13.97 mm), and it mates with plug housing part number 770020-1 (Universal MATE-N-LOCK II) or 350715-1 (Universal MATE-N-LOCK). This connector is commonly used in power circuits for home appliances, particularly gas appliances, where compact design with 19.4 mm mated height and secure locking mechanisms are essential for safe and reliable connections.