MIL-DTL-38999 Series II connectors are designed for rugged environments, featuring up to 128 contacts and a wide operating temperature range from -65°C to 200°C. These connectors, with various mounting options like front and rear wall mount, jam nut, and box mount receptacles, offer versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offering plating options such as cadmium and nickel, they ensure durability and performance. With features like EMI/RFI shielding, bayonet mating, and RoHS compliance options, these connectors are ideal for military and industrial applications requiring secure and high-quality electrical connections.