The MS3112E18-11P is a miniature cylindrical box mounting receptacle connector manufactured by Amphenol Industrial Operations, conforming to MIL-C-26482 Series 1 specifications. This connector features an 18 shell size with solder contact termination and an environmental resisting (Class E) service rating, providing robust protection against moisture and environmental contaminants. The receptacle is designed for box mounting applications with bayonet coupling, offering reliable mating with compatible straight or 90-degree plugs. Key dimensional specifications include a shell diameter of 1.062 inches and a maximum length of 1.312 inches, with a mounting thread of 1.0625-18 NEF. This connector is commonly used in aerospace, military, and industrial applications where reliable electrical connections and environmental resistance are critical requirements.