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 mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. These connectors come in 9 shell sizes, with 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with aluminum shells and offered in plating options such as gold, electroless nickel, and black anodized aluminum, they ensure durability and performance. RoHS certified for environmental compliance, these connectors are suitable for military and industrial applications requiring reliable connectivity in demanding conditions.