MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert with a wide operating temperature range from -65 °C to 200 °C. Designed for harsh environments, this connector family includes front and rear wall mount as well as jam nut receptacles and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, these connectors offer multiple plating options, including cadmium-free finishes, such as electroless nickel. Meeting military specification MIL-DTL-38999 I, they ensure reliability with a mating life of 500 cycles and are suitable for applications requiring environment-resistant wall and jam nut mounting receptacles and plugs.