MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors come in various shell sizes and insert arrangements, with options for front wall mount, rear wall mount, and jam nut receptacles. Utilizing M39029 rear release crimp contacts, they ensure reliable connections in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high strength aluminum shells, they offer a range of plating options, including cadmium-free finishes for RoHS compliance. With a bayonet coupling design and gold contact plating, these connectors guarantee durability and performance in demanding applications.