MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an insert, ensuring reliable signal transmission in harsh environments. These circular receptacles, available in various shell sizes and insert arrangements, feature front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Constructed with durable aluminum shells and offering a choice of plating options including cadmium-free finishes, they guarantee long-lasting functionality. Designed for military and aerospace applications, these connectors have a wide operating temperature range from -65°C to 200°C, making them suitable for use in extreme conditions. With M39029 rear release crimp contacts, they provide secure and efficient connections, meeting stringent performance standards for service class E. Whether for box mounting or through bulkhead installation, these MIL-DTL-38999 I connectors ensure superior conductivity and environmental resistance, essential for mission-critical operations.