MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacles. These connectors are environmentally sealed, operating reliably in temperatures ranging from -65 °C to 200 °C. Compliant with military specification MIL-DTL-38999 I, they offer rugged performance with high-strength aluminum shells and various plating options including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure secure connections in demanding applications. With 52 insert arrangements available, these circular connectors provide versatility for a wide range of industrial and military uses.