MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in a single insert, providing reliable performance in harsh environments. Designed for military specifications, these circular receptacles feature front wall mount, rear wall mount, and jam nut options, accommodating various installation needs. With an operating temperature range from -65°C to 200°C, they ensure durability in extreme conditions. The connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax variants. Constructed with high-strength aluminum shells and available in different plating options such as electroless nickel and cadmium finishes, they offer versatility and corrosion resistance. Suitable for applications requiring environmental sealing, these connectors meet stringent performance standards and are RoHS compliant.