MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. Offering front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs, this connector family is versatile. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in various sizes for optimal connectivity. Constructed with high strength aluminum shells, they come in multiple plating options, including RoHS certified cadmium-free finishes. Meeting military specification MIL-DTL-38999 I, these circular receptacles ensure reliable performance in demanding applications.