MIL-DTL-38999 Series II connectors offer rugged performance with up to 128 contacts in an insert, featuring environmental sealing and a wide operating temperature range from -65 °C to 200 °C. These harsh environment thin-walled connectors come in various styles including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes with 52 insert arrangements, they use 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.