MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range from -65°C to 200°C. These thin-walled connectors come in various mounting options like 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 in different sizes. Made of aluminum, these connectors offer plating options including cadmium finishes and electroless nickel. With a service rating of I and service class E, they ensure reliability in demanding applications.