MIL-DTL-38999 Series I connectors offer high-performance connectivity in harsh environments, featuring up to 128 contacts in an insert for versatile applications. These circular connectors, compliant with military specification MIL-DTL-38999 I, are designed for durability with a wide operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they ensure reliable signal transmission with M39029 rear release crimp contacts. The connectors come in sturdy aluminum shells, offering options for plating finishes such as electroless nickel and cadmium coatings. With front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, they provide secure and efficient connections. Suitable for demanding environments, these connectors are essential for aerospace, defense, and other rugged applications.