MS3102E18-10S is a MIL-DTL-5015 type box mounting receptacle designed for environmental resisting applications. This connector features a shell size 18 with insert arrangement 10, providing 4 contacts of size 12 with service rating A. The receptacle has a thread specification of 1.1250-18NEF Class 2A with a minimum full thread of .625 inches. Key dimensions include K of .891 inches, L of .453 inches, M of .750 inches, and N diameter of 1.000 inches. This connector is commonly used in industrial, military, and aerospace applications where reliable environmental sealing and robust electrical connections are required.