MIL-DTL-38999 Series II connectors boast high performance with up to 128 contacts in an insert, suited for harsh environments with an impressive operating temperature range of -65 °C to 200 °C. These connectors come in various configurations, including front and rear wall mount, jam nut, and box mount receptacles. Offering versatility, they feature straight, RFI grounding, and standard plugs with a 90-degree cable clamp. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in different sizes. Constructed with aluminum shells and plated with options like electroless nickel, they ensure durability and reliable conductivity. Meeting military specification MIL-DTL-38999 II, these circular connectors are ideal for applications requiring rugged and secure electrical connections in demanding environments.