MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with a wide operating temperature range from -65 °C to 200 °C. Available in various configurations including front wall mount, rear wall mount, and jam nut receptacles, they ensure reliable connectivity. With 52 insert arrangements and M39029 rear release crimp contacts, these connectors offer versatility and durability. Constructed with high-strength aluminum shells and plated with options like electroless nickel, they meet stringent military specifications for performance and longevity. Meeting RoHS compliance standards, they are ideal for applications requiring rugged and reliable circular connectors.