MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an impressive operating temperature range of -65°C to 200°C, these connectors are built for durability. Available in various shell sizes and insert arrangements, they offer versatility for different applications. Made of high-strength aluminum, they come with plating options such as gold, electroless nickel, and cadmium finishes. The Series I connectors include front wall mount, rear wall mount, and jam nut receptacles, catering to different installation needs. Utilizing M39029 rear release crimp contacts, they ensure reliable connections. Suitable for military and industrial use, these connectors are known for their rugged construction and high performance in demanding settings.