The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer versatility for different applications. Constructed with high-strength aluminum shells, they come with options for plating, including cadmium-free finishes. With front and rear wall mount, as well as jam nut receptacles, they provide flexibility in installation. Using M39029 rear release crimp contacts, they ensure secure connections. These connectors, with bayonet coupling, are reliable with a mating life of 500 cycles. Suitable for military and industrial use, they offer conductivity and ingress protection, making them ideal for demanding environments.