MIL-DTL-38999 Series II connectors, part of the 38999 II series, feature up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors offer various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes with 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells, they come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. These connectors, meeting military specifications, are RoHS compliant and ensure reliable performance in demanding applications.