The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering reliable performance with up to 128 contacts in an insert. These circular connectors are environmentally sealed, ensuring durability in extreme conditions ranging from -65 °C to 200 °C. Featuring various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they provide versatility for different applications. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts for secure connections. Crafted from aluminum with multiple plating options including cadmium-free finishes, they meet stringent military specifications for quality and performance. With EMI/RFI shielding and conductive properties, these connectors are ideal for demanding environments that require reliable signal transmission.