MIL-DTL-38999 Series II 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 configurations like front and rear wall mount, jam nut, and box mount receptacles, as well as straight and RFI grounding plugs with 90-degree cable clamps. Compatible with M39029 rear release crimp contacts, they come in aluminum shells with plating options including cadmium and nickel. Ensuring reliability with 500 mating cycles, these connectors are suitable for demanding applications requiring EMI/RFI shielding and environmental resistance.