MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with environmental sealing and an operating temperature range of -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs, they offer versatility in applications. Utilizing M39029 rear release crimp contacts, they ensure reliable connections in sizes 22D, 22M, 22, 20, 16, and 8. With options for plating such as electroless nickel and cadmium finishes, including RoHS compliant versions, these connectors meet diverse industrial needs. The high-strength aluminum shells, with 9 shell sizes and 52 insert arrangements, provide durability and performance, making them suitable for military, aerospace, and other demanding environments.