MIL-DTL-38999 Series II connectors are designed for demanding environments, featuring up to 128 contacts in an insert and a wide operating temperature range of -65 °C to 200 °C. These connectors, with various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, offer versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connections. Constructed from aluminum with plating options including gold, electroless nickel, and cadmium finishes, they ensure durability and performance. Meeting MIL-DTL-38999 II military specifications, these connectors are ideal for applications requiring secure and rugged electrical connections in harsh environments.