MIL-DTL-38999 Series I connectors feature up to 128 contacts enclosed in an insert, offering robust environmental sealing and a wide operating temperature range from -65 °C to 200 °C. Designed for harsh environments, this connector family includes front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they accommodate M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, these connectors come in multiple plating options such as cadmium finishes and electroless nickel. RoHS certified cadmium-free finishes are also offered. Suitable for military and industrial applications, they ensure reliable performance in demanding conditions.