MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts within an insert for versatile connectivity. These circular connectors come in various mount types including front wall, rear wall, and jam nut receptacles, all offering RFI grounding plugs. With a wide operating temperature range of -65 °C to 200 °C, they are suitable for demanding applications. Constructed with high-strength aluminum shells and available in different plating options such as gold, electroless nickel, and cadmium-free finishes, these connectors ensure reliable performance. Certified to military specification MIL-DTL-38999 I, they meet stringent requirements for durability and longevity, making them ideal for aerospace, defense, and industrial use.