The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering front wall mount, rear wall mount, and jam nut receptacles. With an operating temperature range of -65 °C to 200 °C, these connectors are environmentally sealed for durability. They come in 9 shell sizes and 52 insert arrangements, using M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they are available in different plating options, including cadmium-free finishes. RoHS certified, these connectors are ideal for applications requiring reliability and performance in challenging conditions.