MIL-DTL-38999 Series I connectors offer reliable performance in harsh environments with up to 128 contacts, sealed for environmental protection. Operating between -65 °C and 200 °C, these connectors come in various configurations including front and rear wall mount as well as jam nut receptacles, featuring RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, accommodating a range of applications. Constructed with high strength aluminum shells and available in different plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they ensure durability. These connectors, compliant with MIL-DTL-38999 I specifications, are designed for demanding military and industrial settings, offering a secure and conductive connection with a mating life of 500 cycles.