MS3102R20-29P is a MIL-DTL-5015 Type standard cylindrical box mounting receptacle connector designed for reliable environmental-resistant applications. This MS-R class connector features a shell size 20 with 17 contacts of size 16, configured in insert arrangement 20-29 with service rating A. The connector incorporates a low-profile assembly design with an axial compression nut and grommet assembly positioned flush with the rear of the insert, utilizing a neoprene grommet with low coefficient of friction for easier wire bundle threading and faster assembly. The shell is fabricated from high-grade aluminum alloy with cadmium plating and olive drab chromate after-treatment for corrosion resistance, while contacts are machined from copper alloy for maximum corrosion resistance and current carrying capacity. This connector is recommended for new design applications requiring enhanced reliability and environmental protection in military and aerospace systems.