MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in applications. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure reliable connectivity. The connectors, made of aluminum, come with plating options such as electroless nickel and cadmium finishes, meeting RoHS compliance. Ideal for military and industrial usage, these connectors provide durable and secure electrical connections in demanding conditions.