MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in a sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, these connectors offer front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity in aerospace and defense applications. The high strength aluminum shells come in various plating options, including cadmium-free finishes, meeting RoHS compliance. Ideal for military and industrial use, these circular connectors provide durable and secure electrical connections.