MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, these connectors come with plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, some RoHS certified. Suitable for military and industrial applications, these connectors provide reliable performance in demanding environments.