MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and environmental sealing. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting options, including front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles, they cater to diverse applications. The connectors come in 9 shell sizes and 52 insert arrangements, with M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating options such as cadmium finishes and electroless nickel, they ensure durability and conductivity. The connectors, meeting MIL-DTL-38999 II specifications, are ideal for military and industrial use, providing a secure and efficient electrical connection.