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 RFI grounding plugs and utilize M39029 rear release crimp contacts. With 9 shell sizes and 52 insert arrangements, these connectors are versatile and reliable, meeting military specifications for durability. Constructed with high-strength aluminum shells and a choice of plating options such as cadmium and nickel, they ensure robust performance in demanding applications. RoHS compliant finishes are also available, making them suitable for a range of industries.