MIL-DTL-38999 Series I connectors feature up to 128 contacts within an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. Available in multiple shell sizes and insert arrangements, these connectors offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Crafted from high-strength aluminum, they come in various plating options including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, these connectors ensure reliable performance in harsh environments, with keyway polarization D and a mating type of bayonet. Ideal for military and industrial applications, they are RoHS compliant and built for longevity with a contact mating life of 500 cycles.