MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Available with straight, RFI grounding, and standard plugs, they feature a 90-degree cable clamp and utilize M39029 rear release crimp contacts. Constructed with aluminum shells and offered in multiple plating options, including RoHS-certified finishes, these connectors ensure durability and reliability in demanding applications.