MIL-DTL-38999 Series I connectors feature up to 128 contacts sealed for harsh environments, with an operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors offer front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. Constructed with high-strength aluminum shells, they come with a choice of plating options, including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity in demanding applications. Compliant with military specifications, these circular receptacles are designed for box mounting with bayonet coupling, providing a secure and durable connection solution.