The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various shell sizes and insert arrangements, they accommodate M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells and offering plating options such as cadmium and nickel, they ensure durability and conductivity. The RFI grounding plugs and front wall mount, rear wall mount, and jam nut receptacles enhance versatility. RoHS compliant finishes are available, making them a suitable choice for diverse applications requiring rugged and dependable connectivity.