MIL-DTL-38999 Series II connectors feature up to 128 contacts in a sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. The thin-walled, restricted length connectors come in 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 use M39029 rear release crimp contacts. Constructed with aluminum shells and offering plating options like gold and electroless nickel, these connectors meet military specifications for durability. Their bayonet coupling and removable crimp contacts make them ideal for secure and reliable electrical connections in demanding applications.