MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With front wall mount, rear wall mount, and jam nut receptacles, they offer versatile connectivity options. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Constructed with high-strength aluminum shells and available in various plating options, including RoHS-certified finishes, they ensure durability and reliability. Utilizing M39029 rear release crimp contacts, they come in 9 shell sizes and 52 insert arrangements, catering to diverse application needs. The connectors, with a bayonet coupling design, provide secure mating with a mating life of 500 cycles. Suitable for military and industrial use, they offer excellent conductivity and ingress protection, making them ideal for demanding settings.