The MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in front and rear wall mount, as well as jam nut receptacles, they offer RFI grounding plugs for added protection. With 52 insert arrangements and M39029 rear release crimp contacts, including coax and twinax options, these connectors ensure versatile connectivity. Constructed with high-strength aluminum shells and various plating finishes such as cadmium and nickel, they meet stringent military specifications for reliability. The RoHS-certified options guarantee compliance with environmental standards, making them suitable for a wide range of applications.