MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within an insert. With a wide operating temperature range from -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse installation requirements. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium-free finishes, they ensure durability and compliance with RoHS standards. These connectors, with bayonet coupling and gold-plated contacts, are ideal for military and industrial applications where ruggedness and high performance are essential.