MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, designed for rugged applications with an operating temperature range spanning -65 °C to 200 °C. The connector family offers front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, catering to diverse installation needs. With 9 shell sizes and 52 insert arrangements, they accommodate various contact configurations, using M39029 rear release crimp contacts. Constructed with high strength aluminum shells, these connectors are available in multiple plating options, including cadmium-free finishes for RoHS compliance. Suitable for military and industrial use, they ensure reliable performance in harsh environments, meeting MIL-DTL-38999 I specifications.