MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various mounting options including front wall, rear wall, and jam nut receptacles, they offer versatility in applications. With 52 insert arrangements and M39029 rear release crimp contacts in multiple sizes, these connectors ensure reliable connections. Constructed with high-strength aluminum shells and offering plating options such as cadmium and nickel, they meet stringent military specifications. The RoHS-certified variants provide environmentally friendly finishes, making them ideal for demanding military and aerospace applications.