MIL-DTL-38999 Series I connectors are engineered for rugged environments, offering reliable connectivity with up to 128 contacts. These circular receptacles, featuring front wall mount, rear wall mount, and jam nut options, meet stringent military specifications for durability. With a wide operating temperature range of -65 °C to 200 °C, they ensure performance in extreme conditions. The connectors, available in 9 shell sizes and 52 insert arrangements, utilize high-strength aluminum shells and gold-plated removable crimp contacts. Various plating options, including electroless nickel and cadmium finishes, cater to diverse application needs. RoHS compliant alternatives are also offered. Perfect for back panel wall mounting, these connectors provide secure, conductive connections in demanding environments, making them ideal for military and industrial applications.