MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, they include front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come with different plating options such as electroless nickel and cadmium finishes. RoHS compliant versions are also available, ensuring suitability for diverse applications requiring reliable connectivity in demanding conditions.