MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer options for front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. These connectors utilize M39029 rear release crimp contacts and come in high-strength aluminum shells with multiple plating choices, including RoHS-certified cadmium-free finishes. Ideal for harsh environments, they ensure reliable performance with their bayonet coupling and conductive pin contact style, suitable for military and industrial applications requiring durability and resistance to environmental factors.