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 mounting styles 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 multiple plating options including cadmium-free finishes, they ensure durability and compliance. Meeting MIL-DTL-38999 II military specifications, these circular receptacles provide reliable connectivity for applications requiring rugged performance.