MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts sealed for environmental protection. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliability 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 needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells, they offer durability and are available with different plating options, including cadmium-free finishes for RoHS compliance. Ideal for military and industrial applications, these connectors ensure secure and efficient electrical connections.