MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering front wall mount, rear wall mount, and jam nut receptacles. With an operating temperature range of -65 °C to 200 °C, they are environmentally sealed for reliable performance. These connectors, part of the military specification MIL-DTL-38999 I, use M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, they come with plating choices like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified cadmium-free finishes are also available. Suitable for demanding applications, these connectors ensure secure and durable electrical connections in challenging conditions.