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. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in application. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in various sizes, ensuring reliable connectivity. Constructed with high strength aluminum shells, these connectors come in different plating options such as cadmium and nickel, meeting diverse requirements. Their RoHS certified finishes provide an environmentally friendly solution. Suitable for military and industrial use, these connectors guarantee durability with 500 mating cycles and are ideal for environment-resistant box and through bulkhead mounting receptacle types.