MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, this connector family includes RFI grounding plugs and M39029 rear release crimp contacts in various sizes. With 9 shell options and 52 insert arrangements, they cater to diverse connectivity needs. Constructed with high-strength aluminum shells, these connectors are available in plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified finishes. Suitable for harsh environments, they ensure reliability with features like bayonet coupling, gold contact plating, and a service rating of I. The Series I connectors are ideal for applications requiring durability and performance in demanding conditions.