The MIL-DTL-38999 Series I connectors offer high-performance connectivity solutions for harsh environments. With up to 128 contacts in an insert, these circular receptacles are ideal for demanding applications. Featuring front wall mount, rear wall mount, and jam nut receptacles, they provide versatility in installation. Constructed with high-strength aluminum shells and environmentally sealed, they ensure reliable operation in extreme conditions. The connectors accommodate M39029 rear-release crimp contacts in various sizes, including coax and twinax. Available in 9 shell sizes and 52 insert arrangements, they offer flexibility for different configurations. With plating options such as electroless nickel and RoHS certified finishes, they meet stringent requirements for performance and compliance. Suitable for military and industrial use, these connectors guarantee durability and connectivity in challenging settings.