MS3112E12-10P is a miniature cylindrical box mounting receptacle connector designed for aerospace and military applications per MIL-C-26482, Series 1 specifications. It features a shell size 12 with 10 solder contacts arranged in a 12-10 insert pattern, providing reliable electrical connections in compact form factors. The connector employs bayonet coupling for quick-connect/disconnect operations and is available with environmental sealing (Class E designation) for moisture-proofing with multi-holed grommet and clamping nut. The receptacle front contact diameter is 0.938 inches with a maximum shell depth of 1.031 inches, and it accommodates size 20 contacts. This connector is widely used in avionics, military communications, and industrial control systems where rugged, reliable interconnections are required in space-constrained environments.