MIL-DTL-38999 Series I connectors offer rugged performance with up to 128 contacts in an insert. These environmentally sealed connectors are designed for harsh environments, operating flawlessly in temperatures ranging from -65 °C to 200 °C. Featuring various mounting options such as front wall, rear wall, and jam nut receptacles, they ensure versatile installation. With 52 insert arrangements and M39029 rear release crimp contacts in multiple sizes, including coax and twinax, these connectors offer flexibility in connectivity. Constructed with high-strength aluminum shells and available in different plating options like electroless nickel, they guarantee durability and reliability. RoHS certified cadmium-free finishes make them environmentally friendly, suitable for a wide range of applications requiring secure and efficient electrical connections.