MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering environmental sealing. With an operating temperature range of -65 °C to 200 °C, these connectors are versatile for various applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. The connectors come in aluminum shells with options for plating, including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Offering front and rear wall mount, jam nut, and box mount receptacles, as well as straight, RFI grounding, and standard plugs, they cater to diverse installation needs. The connectors, meeting MIL-DTL-38999 II specifications, are known for their reliability, with bayonet coupling and removable crimp contacts ensuring secure connections. Their durability, conductivity, and environmental resistance make them ideal for military, aerospace, and industrial applications where rugged performance is essential.