MIL-DTL-38999 Series I connectors feature up to 128 environmentally sealed contacts in an insert, designed for harsh environments with an operating temperature range spanning from -65 °C to 200 °C. This connector family offers front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, providing versatility in connectivity solutions. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, they come with a range of plating options such as cadmium finishes and electroless nickel, catering to diverse application needs. Ideal for military and industrial use, these connectors ensure reliable performance, meeting stringent quality standards.