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. This 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, including coax and twinax options. Constructed with high strength aluminum shells, they come in a range of plating choices like cadmium and nickel, with RoHS compliant finishes offered. Ideal for military and industrial applications, these connectors ensure reliable performance with features like bayonet coupling, gold contact plating, and a durable shell design.