The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts within a sealed insert. With an operating temperature range of -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 application needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 crimp contacts in different sizes. Constructed with aluminum shells and offering a range of plating options including cadmium-free finishes, they ensure durability and compliance with RoHS regulations. Ideal for military and industrial use, these connectors provide secure and efficient electrical connections in demanding environments.