MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. These circular connectors can accommodate up to 128 contacts and are environmentally sealed for reliable performance. Operating within a wide temperature range of -65 °C to 200 °C, they are suitable for demanding applications. Constructed with high-strength aluminum shells, they come in various plating options, including cadmium-free finishes for RoHS compliance. With 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts, ensuring secure and efficient connections. Ideal for military and industrial use, they offer durability and conductivity in challenging conditions.