MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in a sealed insert, ideal for harsh environments. With a wide operating temperature range of -65 °C to 200 °C, these connectors feature wall mount, rear mount, and jam nut receptacles, along with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connections. Constructed with high-strength aluminum shells and various plating options, including cadmium-free finishes, these connectors ensure durability and performance. Suitable for military and industrial applications, they are RoHS compliant and guarantee 500 mating cycles.