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. The connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes for optimal connectivity. Crafted with high strength aluminum shells, they come in a range of plating options, including cadmium-free finishes for RoHS compliance. Suitable for military and industrial applications, these connectors ensure reliable performance with features like bayonet coupling, gold contact plating, and environmental resistance.