MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts with environmental sealing. Operating within a wide temperature range of -65°C to 200°C, they offer reliability in extreme conditions. Available in various configurations such as front and rear wall mount, as well as jam nut receptacles, they ensure secure connections. Utilizing M39029 rear release crimp contacts, these connectors come in 9 shell sizes and 52 insert arrangements. Constructed with high strength aluminum shells, they offer durability. Plating options include light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Suitable for military and industrial applications, these connectors provide efficient performance in demanding settings.