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. Available in various mounting styles including front and rear wall mount, as well as jam nut receptacles, these connectors offer RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, ensuring reliable connectivity. Constructed with high strength aluminum shells and offering plating options such as electroless nickel and cadmium finishes, these connectors meet stringent military specifications for performance and durability in harsh environments.