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. The connector family offers front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. These connectors come in high-strength aluminum shells with plating options like cadmium and nickel, offering RoHS-certified finishes. Ideal for military and industrial applications, they ensure reliable performance with their environment-resistant design.