MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range of -65°C to 200°C. These harsh environment connectors come in various styles like front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts. The plugs, offered in straight, RFI grounding, and standard with a 90-degree cable clamp, are designed for military applications. Constructed with aluminum shells and various plating options like cadmium, electroless nickel, and black anodized, they ensure durability. RoHS compliant options are also available, making them suitable for a wide range of industries requiring reliable connectivity in challenging environments.