MIL-DTL-38999 Series I connectors offer up to 128 contacts in an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65°C to 200°C. Featuring various mounting options such as front wall, rear wall, and jam nut receptacles, they ensure secure connections in harsh environments. With 9 shell sizes and 52 insert arrangements available, these connectors use M39029 rear release crimp contacts for reliable performance. Constructed with high-strength aluminum shells and offering multiple plating options including cadmium-free finishes, they meet stringent military specifications for durability and reliability. Perfect for applications requiring robust connectivity, these connectors are ideal for use in aerospace, defense, and other demanding industries.