MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements, they accommodate various contact configurations, including M39029 rear release crimp contacts. Constructed with high-strength aluminum shells, these connectors come with plating options such as cadmium, nickel, and anodized finishes, meeting RoHS compliance. Suitable for military and industrial use, they ensure reliable connectivity in harsh environments.