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 mounting options including front and rear wall mount, as well as jam nut receptacles, they offer RFI grounding plugs for added reliability. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in multiple sizes, including coax and twinax. Constructed with high strength aluminum shells, they come with a choice of plating options such as cadmium and nickel, ensuring durability. RoHS certified finishes are also available. Ideal for military applications, these connectors are known for their reliability and performance in demanding environments.