MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations, including front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs for enhanced performance. Compliant with military specification MIL-DTL-38999 I, these circular connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts for reliable connections. Constructed with high-strength aluminum shells, they are offered in a range of plating options, including cadmium-free finishes for RoHS compliance. Suitable for demanding applications, these connectors ensure secure and durable electrical connections in challenging environments.