MIL-DTL-38999 Series I connectors are designed for rugged environments, featuring up to 128 contacts in a sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts. The connectors come in high-strength aluminum shells with options for plating, including cadmium-free finishes. Offered in different mounting styles, such as front wall mount, rear wall mount, and jam nut receptacles, these connectors are ideal for military and aerospace applications requiring durability and environmental resistance.