MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an environmentally sealed insert. Operating between -65°C and 200°C, these connectors offer versatility in various applications. Available in multiple configurations including front and rear wall mount, jam nut, and box mount receptacles, they ensure secure connectivity. With options for straight, RFI grounding, and standard plugs, along with various shell sizes and insert arrangements, these connectors provide flexibility. Constructed with aluminum shells, they come with plating choices such as cadmium and nickel, catering to diverse needs. Meeting military specifications, these connectors guarantee reliability with features like gold contact plating, bayonet coupling, and high mating cycles. Suitable for demanding environments, they offer efficient performance in critical operations.