MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These circular connectors are environmentally sealed and can operate in temperatures ranging from -65°C to 200°C. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount, they offer versatility in installation. With options for straight, RFI grounding, and standard plugs with a 90-degree cable clamp, they cater to different connectivity needs. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 12. The aluminum shells come with plating options including cadmium and nickel, meeting diverse application requirements. These connectors are ideal for military specifications and other demanding environments where reliability is crucial.