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, they offer versatility in installation. These connectors are environmentally sealed and can operate in temperatures ranging from -65°C to 200°C. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Built for durability, they come in high-strength aluminum shells with various plating options, including cadmium-free finishes for RoHS compliance. The bayonet coupling mechanism and gold contact plating provide reliable performance, making them ideal for military and industrial applications where ruggedness and longevity are essential.