MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range from -65 °C to 200 °C. Available in various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear-release crimp contacts. Constructed with aluminum shells, they are offered with plating options such as iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. These connectors, meeting MIL-DTL-38999 II specifications, ensure reliable performance in demanding applications requiring EMI/RFI shielding and environmental resistance.