DESCRIPTION

D38999/52W21N is a metal protective connector cover designed for MIL-DTL-38999 Series IV receptacle connectors, featuring an Olive Drab Cadmium finish and ring lanyard style. The cover is constructed from an aluminum alloy body with a silicone-based rubber gasket and passivated stainless steel rope with PTFE cover, providing rugged environmental sealing against dust, foreign objects, and moisture intrusion in the unmated condition. For shell size 21, the cover has a maximum A diameter of 1.122 inches, maximum B diameter of 1.732 inches, maximum C diameter of 1.688 inches, and minimum D diameter of 2.031 inches. The fastener tensile strength is a minimum of 25 lbs, with an air leak rate not exceeding 1 atmospheric cubic inch per hour, and coupling torque conforming to MIL-DTL-38999 Series IV requirements. This protective cover is widely used in military and commercial avionics systems, ground vehicles, radar systems, and missile launch platforms to extend connector service life and maintain system reliability.