The MIL-DTL-38999 Series I connectors feature up to 128 contacts enclosed in an insert, designed for harsh environmental conditions with a wide operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, ensuring secure connections. Constructed with high-strength aluminum shells, these connectors come with different plating options, including cadmium-free finishes for RoHS compliance. Suitable for military and industrial applications, they provide reliable performance in demanding environments.