MIL-DTL-38999 Series II connectors, designed for harsh environments, offer up to 128 contacts in a sealed insert. Operating between -65°C and 200°C, these connectors come in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. The aluminum shells come with options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum plating, with RoHS-certified cadmium-free finishes. Suitable for military applications, they ensure reliable performance with a mating life of 500 cycles.