The MIL-DTL-38999 Series I connectors offer a robust solution for harsh environments, featuring up to 128 contacts in an insert. These circular connectors are designed for wall mounting, with options for front wall mount, rear wall mount, and jam nut receptacles. Operating in temperatures ranging from -65 °C to 200 °C, they are environmentally sealed for reliable performance. Utilizing M39029 rear release crimp contacts, they ensure secure connections in various applications. Available in 9 shell sizes and 52 insert arrangements, they come in high strength aluminum shells with multiple plating options, including cadmium-free finishes for RoHS compliance. With bayonet coupling and a MIL-DTL-38999 I military specification, these connectors guarantee durability and conductivity in demanding settings.