MS3102E18-11S is an environmental resisting box mounting receptacle connector conforming to MIL-DTL-5015 and MIL-5015 type standards. This connector features shell size 18 with an 18-11 insert arrangement providing 5 size 12 contacts with socket configuration and Service Rating A. The shell incorporates a 1.1250-18NEF thread class 2A coupling mechanism with 0.625 inch minimum full thread engagement. Key dimensions include N diameter of 1.000 inch, S dimension of 1.062 inch, and T mounting hole diameter of 0.120 inch. This connector is commonly used in industrial, military, and aerospace applications requiring reliable environmental sealing and robust electrical connections.