MIL-DTL-38999 Series I connectors are ideal for harsh environments, featuring up to 128 contacts in an insert and offering front wall mount, rear wall mount, and jam nut receptacles. With a wide operating temperature range of -65 °C to 200 °C, these connectors are designed for durability. They come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts in various sizes. The connectors have high-strength aluminum shells with options for plating, including cadmium-free finishes. They meet military specification MIL-DTL-38999 I and are RoHS compliant, ensuring reliable performance in demanding applications.