211771-2 is a CPC (Circular Plastic Connector) Series 1 square flange receptacle with threaded inserts designed for commercial signal and power applications. This standard sex connector features a shell size 23 with 19 positions and keying style A, accepting pin contacts that must be ordered separately. The housing is constructed from UL 94V-0 rated thermoplastic material in black, providing excellent heat resistance and self-extinguishing properties. The connector operates over a temperature range of -55°C to +105°C and supports voltage ratings up to 250 VAC/DC. It includes four 4-40 threaded inserts for secure panel mounting and offers quick connect/disconnect capability with positive detent coupling, making it ideal for industrial control, instrumentation, and equipment interconnection applications.