MIL-DTL-38999 Series I connectors offer reliable connectivity in harsh environments with up to 128 contacts in an insert. Featuring front wall mount, rear wall mount, and jam nut receptacles, they ensure secure connections. These circular connectors, compliant with military specification MIL-DTL-38999 I, are built for durability, with high-strength aluminum shells and a variety of plating options, including cadmium-free finishes. Operating between -65°C and 200°C, they guarantee performance in extreme conditions. Utilizing M39029 rear release crimp contacts, these connectors are suitable for various applications, with 52 insert arrangements available. The bayonet coupling design and gold contact plating ensure efficient mating and conductivity. With a service rating of M and ingress protection, they are ideal for demanding environments.