MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, these connectors are versatile. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they are available in different plating options including cadmium-free finishes. Meeting military specification MIL-DTL-38999 I, these circular receptacles are ideal for applications requiring durability and reliability in challenging conditions.