MIL-DTL-38999 Series I connectors offer high performance in harsh environments with up to 128 contacts, rugged construction, and environmental sealing. Designed for reliability, these connectors feature various mounting options including front and rear wall mount, and jam nut receptacles. With a wide operating temperature range of -65°C to 200°C, they are suitable for demanding applications. The connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with high strength aluminum shells, they are available in different plating options such as cadmium and nickel, ensuring durability. Meeting MIL-DTL-38999 I military specifications, these circular plugs provide secure and efficient connectivity for critical systems.