MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in applications. With options for straight, RFI grounding, and standard plugs, along with 52 insert arrangements utilizing M39029 rear release crimp contacts, these connectors provide reliable connectivity. Constructed with aluminum shells and offering plating choices like cadmium and nickel, they ensure durability and performance. RoHS compliant options are available, making them suitable for diverse industries requiring secure and environmentally sealed connections.