MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed 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, all utilizing M39029 rear release crimp contacts. Constructed with high-strength aluminum shells, these connectors come with a choice of plating options including cadmium-free finishes. RoHS certified, they ensure reliability with gold-plated contacts, bayonet coupling, and a service rating of I for environment-resistant applications.