MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. Constructed with aluminum shells and offering multiple plating options, including RoHS certified finishes, these connectors ensure durability and performance in demanding applications.