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, these connectors come in various styles like front wall mount, rear wall mount, and jam nut 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. Constructed with aluminum shells and offering plating options such as cadmium-free finishes, electroless nickel, and black anodized aluminum, these connectors meet rigorous military specifications for reliability. Perfect for applications requiring high performance in demanding conditions, they ensure secure and durable connectivity.