MIL-DTL-38999 Series I connectors are designed for harsh environments, offering front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. With up to 128 contacts in an insert, they provide versatile connectivity options. These circular receptacles, featuring M39029 rear release crimp contacts, ensure reliable performance in extreme temperatures ranging from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they cater to various application needs. Constructed with high-strength aluminum shells and offering plating options such as electroless nickel and cadmium finishes, they guarantee durability and corrosion resistance. Meeting MIL-DTL-38999 I military specifications, these connectors are ideal for demanding environments requiring rugged and secure connections.