MIL-DTL-38999 Series II connectors are designed for demanding environments, with up to 128 contacts housed in a sealed insert. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility in mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in various shell sizes and insert arrangements, they feature durable aluminum shells with plating options such as gold, electroless nickel, and cadmium finishes. With a bayonet coupling and removable crimp contacts, they ensure reliable connectivity in applications requiring harsh environment resistance.