MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range from -65°C to 200°C. Available in various mounting options like front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. With 52 insert arrangements and M39029 rear release crimp contacts, these connectors ensure reliable electrical connections. The aluminum shells come in different plating options such as gold, electroless nickel, and cadmium finishes, catering to diverse needs. RoHS compliant versions are also available, making them suitable for environmentally conscious projects. Designed for durability, these connectors are ideal for military and industrial applications requiring high-performance connectivity in rugged conditions.