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 shell sizes and insert arrangements, they offer front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. Utilizing M39029 rear release crimp contacts, these connectors ensure secure connections. Constructed with high-strength aluminum shells and offered in different plating options such as gold, electroless nickel, and cadmium-free finishes, they provide reliable performance. With a mating type of bayonet coupling and a service rating of M, these connectors are suitable for a wide range of applications requiring durability and environmental resistance.