The 97-3102A-20(639)(0850) is a box receptacle connector from the Amphenol 97 Series standard cylindrical connectors designed for solder-type terminations. This connector features solid shell construction optimized for open wiring applications and mounts directly on chassis, equipment, or panels with an internal polarized key in the front shell. It operates across a temperature range of -55°C to +125°C and supports up to 22 circuits with multiple insert arrangements available. The connector includes threaded coupling with hard dielectric inserts, non-rotating contacts, and is UL recognized (File E115497) and CSA certified (File LR69183). The bright chromate/cadmium plating (639) provides enhanced corrosion resistance, making it suitable for demanding industrial environments including aerospace, military, and telecommunications applications.