MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering various receptacle options such as front and rear wall mount, jam nut, and box mount, these connectors ensure secure and reliable connections. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and plated with options like electroless nickel and cadmium finishes, they meet RoHS compliance standards. Ideal for military and industrial applications, these connectors are known for their durability and conductivity, making them suitable for demanding environments.