MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, they offer versatility for various applications. Available in different mount types such as front wall, rear wall, jam nut, and box mount receptacles, these connectors ensure secure connections. With options for straight, RFI grounding, and standard plugs, they come in 9 shell sizes and 52 insert arrangements, accommodating different requirements. Utilizing M39029 rear release crimp contacts, they guarantee reliable performance. Made of aluminum, these connectors offer durability and are available in various plating options including cadmium-free finishes, ensuring compliance with RoHS regulations. Ideal for military and industrial use, they provide conductivity and ingress protection, making them suitable for demanding environments.