MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts for high-density applications. These connectors are environmentally sealed and can withstand temperatures ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer flexibility for different mounting options, including front and rear wall mount as well as jam nut receptacles. Utilizing M39029 rear release crimp contacts, they ensure secure and reliable connections. The connectors come in high strength aluminum shells with a choice of plating options, including cadmium-free finishes for RoHS compliance. With a service rating of I, they are suitable for demanding applications that require durability and performance in challenging conditions.