MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. Available in various mounting styles including front wall mount, rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. The connectors come in 9 shell sizes and 52 insert arrangements, with M39029 rear release crimp contacts. Constructed with aluminum shells and offering multiple plating options such as electroless nickel and cadmium finishes, they ensure durability and reliable performance. These connectors, compliant with RoHS standards, are ideal for military, aerospace, and other demanding industries.