The 1-641966-1 is a 4-circuit, vertical pin header from the Universal MATE-N-LOK connector series, designed for wire-to-board connections. It features a black, UL94V-0 flame retardant nylon housing with a maximum operating temperature of 120°C. The header has a .250 inch centerline spacing, pre-tinned phosphor bronze contacts, and polarized standard tails suitable for .062 inch thick PC boards. The connector system is rated for 600V AC/DC and has a dielectric withstanding voltage of 5.0 KVAC. This RoHS compliant header provides a reliable and positively locked connection, making it suitable for a wide range of industrial and commercial electronic applications.