The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mount types such as front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. With options for straight, RFI grounding, and standard plugs, and using M39029 rear release crimp contacts, these connectors ensure reliable connectivity. Made of aluminum with plating options including electroless nickel and cadmium finishes, they meet stringent military specifications for durability. With a service rating of M and a service class of E, they are suitable for demanding environments. RoHS compliant options are also available, making them environmentally friendly choices.