MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various shell sizes and insert arrangements, they come in high-strength aluminum shells with options for plating finishes such as electroless nickel and cadmium olive drab. Compatible with M39029 rear release crimp contacts, they are suitable for military and industrial applications requiring rugged connectivity. The connector types include front wall mount, rear wall mount, and jam nut receptacles, all meeting stringent MIL-DTL-38999 I specifications for durability and reliability.