MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating reliably between -65 °C and 200 °C, these connectors come in various configurations such as front and rear wall mount, jam nut, and box mount receptacles. Available with straight, RFI grounding, and standard plugs, they offer versatility in connectivity. With 52 insert arrangements using M39029 rear release crimp contacts, these connectors ensure secure connections. Constructed with aluminum shells and plated with options like electroless nickel, they meet stringent quality standards. RoHS compliant finishes are also available, making them suitable for a wide range of applications requiring durability and reliability.