643412-1 is a 2-circuit polarized socket header designed for use in Universal MATE-N-LOK and Universal MATE-N-LOK II connector systems. This in-line style header features a pre-tin socket finish and meets UL94V-0 flammability rating requirements. The header has a standard tail length of 0.175 inches (4.45 mm) and an A dimension of 0.550 inches (13.97 mm). It is designed to mate with plug housings using pin contacts, including Universal MATE-N-LOK II part number 770017-1 and Universal MATE-N-LOK part number 350777-1. This connector is suitable for wire-to-board applications requiring reliable power and signal connections.