MIL-DTL-38999 Series I connectors feature up to 128 contacts in a sealed 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, they provide RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they come with plating options such as cadmium finishes and RoHS-certified alternatives. Ideal for military and industrial applications, these connectors ensure reliable performance with their durable design.