MIL-DTL-38999 Series I connectors feature up to 128 contacts, offering robust environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, they include front and rear wall mount options, jam nut receptacles, and RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Their high-strength aluminum shells come in multiple plating options like cadmium and nickel, catering to diverse application needs. These connectors are ideal for military and industrial settings requiring reliable, durable connectivity.