755-129-9 a straight, male BNC plug with a frequency of 4GHz. Voltage rating is 500Vrms and nominal impedance of 50Ω. Gasket is made of silicone rubber; insulator is teflon; outer/center contact and spring washer is berrylium copper; k-grip sleeve is commercial bronze; all other metal parts are brass. Center contact is in hard gold plating finish, spring washer is silver plated, and all other metal parts are in Kings tarnish resistant finish. The product is small and lightweight and features a quick connect and disconnect bayonet coupling design.