MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering reliable performance in temperatures ranging from -65 °C to 200 °C. With various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse application needs. These connectors, compliant with military specification MIL-DTL-38999 II, come in aluminum shells with plating options including electroless nickel and cadmium finishes. Utilizing M39029 rear release crimp contacts, they ensure secure connections, with 55 contacts in this specific model. The extended grommet box mounting configuration, with bayonet coupling, is ideal for demanding environments, meeting service rating I standards. Featuring RoHS compliant finishes, these connectors offer durability and performance in critical applications.