MIL-DTL-38999 Series I connectors feature up to 128 contacts within an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options including front wall, rear wall, and jam nut receptacles, they offer reliable RFI grounding. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high strength aluminum shells and offering plating choices like electroless nickel, they ensure durability. These circular connectors, compliant with MIL-DTL-38999 I specifications, are ideal for applications requiring secure and robust electrical connections in demanding environments.