The MIL-DTL-38999 Series I connectors feature up to 128 contacts within an environmentally sealed insert, designed for harsh operating conditions with a wide temperature range of -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs, they offer versatility in connectivity solutions. Compliant with military specifications, these connectors come in high-strength aluminum shells with options for plating, including RoHS-certified finishes. Utilizing M39029 rear release crimp contacts in different sizes, they ensure reliable performance in demanding environments. Suitable for box mounting applications, these circular receptacles with bayonet coupling provide secure and durable connections.