The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for rugged environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options including front and rear wall mount receptacles, as well as jam nut receptacles, they offer versatility in installation. With 52 insert arrangements utilizing M39029 rear release crimp contacts, these connectors ensure secure connections. Constructed with high strength aluminum shells and offered in different plating options such as cadmium and nickel, they provide durability and corrosion resistance. Meeting military specifications, these circular connectors are ideal for applications requiring reliable performance in harsh conditions.