The MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an insert, designed for harsh environments. Featuring various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, these connectors ensure secure installations. With a wide operating temperature range of -65 °C to 200 °C, they are suitable for demanding applications. Available in 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts. Constructed with aluminum shells and offering multiple plating options including electroless nickel and cadmium finishes, these connectors provide durability and reliability. RoHS compliant options are also available, making them environmentally friendly choices for military, aerospace, and industrial use.