50 Ohm RF coaxial BNC bulkhead feedthrough jack-jack adapters with a nickel plated body and gold contact plating. These 50 Ohm RF coax BNC bulkhead feedthrough jack-jack adapters are supplied with a jam nut and washer. Stock number 821-9003 has a 0.38μm gold plated jack adapter assembly Stock number 782-7509 has a 1.27μm gold plated jack adapter assembly A bushing is available separately, see stock number 787-1622