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. Available in various configurations including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with aluminum shells and offering plating options like cadmium and electroless nickel, they ensure durability and reliability. With RoHS compliant finishes available, these connectors are ideal for military and industrial applications requiring secure electrical connections in demanding conditions.