MIL-DTL-38999 Series II connectors offer robust performance in harsh environments, featuring up to 128 contacts within an insert for versatile connectivity. These circular receptacles, designed for military specifications, ensure reliable operation in extreme conditions, with an operating temperature range from -65 °C to 200 °C. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount options, they cater to diverse application needs. The connectors boast durability with aluminum shells and offer enhanced protection with plating options such as electroless nickel and cadmium finishes. Utilizing gold-plated removable crimp contacts, they guarantee efficient signal transmission, while their bayonet coupling mechanism facilitates secure mating. With a service rating of M and compliance with RoHS standards, these connectors are ideal for demanding environments requiring rugged and dependable electrical connections.