MIL-DTL-38999 Series I connectors, designed for harsh environments, feature up to 128 contacts in an insert. These circular connectors are front wall mount, rear wall mount, or jam nut receptacles, offering RFI grounding plugs. With a wide operating temperature range from -65 °C to 200 °C, they are ideal for demanding applications. The connectors, conforming to military specification MIL-DTL-38999 I, come in high-strength aluminum shells with various plating options, including electroless nickel and cadmium finishes. Utilizing M39029 rear release crimp contacts, they ensure secure connections and are available in multiple contact sizes. RoHS compliant options are also available, making them suitable for diverse industrial needs.