MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs, they offer versatility in connectivity solutions. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable performance. Constructed with high strength aluminum shells and offered in different plating options such as cadmium and nickel, they ensure durability and conductivity. Suitable for military and industrial applications, these circular connectors meet stringent performance standards for environmental resistance and reliability.