MIL-DTL-38999 Series I connectors are designed for harsh environments, offering up to 128 contacts in an environmentally sealed insert with a wide operating temperature range from -65 °C to 200 °C. Featuring front wall mount, rear wall mount, and jam nut receptacles, they provide RFI grounding options. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in a range of plating options, including cadmium-free finishes. With a bayonet coupling and box mounting flange, these connectors are ideal for military and industrial applications, ensuring reliable performance in demanding conditions.