MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. These versatile connectors come in various styles including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offered in different plating options such as cadmium and electroless nickel, these connectors ensure durability and performance. Compliant with RoHS regulations, they are ideal for military and industrial applications requiring secure and high-quality connectivity.