MIL-DTL-38999 Series I connectors feature up to 128 contacts within an insert, offering robust environmental sealing and a wide operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors come in high strength aluminum shells with options for plating finishes such as electroless nickel and cadmium olive drab. They include front wall mount, rear wall mount, and jam nut receptacles, with RFI grounding plugs for added versatility. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity in harsh environments. RoHS certified options are available, making them suitable for diverse applications requiring durability and performance.