MIL-DTL-38999 Series I connectors feature up to 128 contacts enclosed in an insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Utilizing M39029 rear release crimp contacts in multiple sizes, they ensure secure connections. Constructed with high-strength aluminum shells, they come with plating options including electroless nickel and cadmium finishes, meeting RoHS standards. With a mating type of bayonet and a service rating of M, these connectors are ideal for environment-resistant applications.