MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts within an insert. These circular connectors are front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, offering versatility in installation. With a wide operating temperature range of -65°C to 200°C, they are suitable for diverse applications. Made of high-strength aluminum, they come in various plating options including cadmium-free finishes, ensuring durability and reliability. Utilizing M39029 rear release crimp contacts, they provide secure connections with sizes 22D, 22M, 22, 20, 16, and 8. Meeting MIL-DTL-38999 I military specifications, these connectors are ideal for demanding industries requiring rugged and environmentally sealed connectivity.