MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating range of -65 °C to 200 °C. Available in front and rear wall mount, as well as jam nut receptacles with RFI grounding plugs, they offer versatility in connectivity. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells and offering a range of plating options, such as cadmium and nickel, these connectors ensure durability and reliability. Compliance with RoHS standards further underscores their quality and suitability for diverse applications in military and industrial settings.