MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with a wide operating temperature range from -65 °C to 200 °C. These connectors come in various styles including front and rear wall mount, jam nut, and box mount receptacles, with straight, RFI grounding, and standard plugs available. Offering 52 insert arrangements with M39029 rear release crimp contacts, they ensure secure connections. Constructed with aluminum shells and plated in options such as electroless nickel, they meet stringent military specifications for reliability. With a bayonet coupling and gold contact plating, they provide durable performance in demanding applications.