The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and environmental sealing for reliable performance. Operating between -65 °C and 200 °C, these connectors offer versatility in a wide range of conditions. Available in various mount types such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse installation needs. With 52 insert arrangements and M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12, they ensure secure connections. Constructed with aluminum shells and offering plating options like iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they meet strict military specifications. RoHS compliant finishes further enhance their environmental suitability. Suitable for military, aerospace, and industrial applications, these connectors are known for their durability, conductivity, and resistance to environmental factors.