MIL-DTL-38999 Series I connectors feature up to 128 contacts sealed for environmental protection, with an operating temperature range of -65 °C to 200 °C. Offering versatility, they come in various mount types including front and rear wall mount, as well as jam nut receptacles, with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high strength aluminum shells, they offer plating options such as cadmium and electroless nickel. Meeting MIL-DTL-38999 I military specifications, these circular receptacles ensure reliable performance in harsh environments.