MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range of -65 °C to 200 °C. These harsh environment connectors come in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts. Constructed with aluminum shells and offered in different plating options like gold and electroless nickel, they meet RoHS compliance standards. These connectors are ideal for military and industrial applications requiring durability and reliability in challenging environments.