MIL-DTL-38999 Series I connectors feature up to 128 contacts housed 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 wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Utilizing M39029 rear release crimp contacts, these connectors come in high-strength aluminum shells with plating options including cadmium-free finishes. RoHS certified, they provide reliable performance with gold-plated removable crimp contacts, mating through bayonet coupling, and offering environmental resistance for demanding applications.