The MIL-DTL-38999 Series II connectors are engineered for harsh environments, boasting up to 128 contacts in a single insert. These circular receptacles, featuring various mounting options like front and rear wall mount, offer reliable performance in extreme temperatures ranging from -65 °C to 200 °C. Built to military specification, they ensure durability and functionality in demanding applications. With gold-plated removable crimp contacts in size 22D(55), these connectors guarantee optimal conductivity and a mating life of 500 cycles. Available in 9 shell sizes and 52 insert arrangements, they cater to diverse connectivity needs. Crafted from aluminum with RoHS-compliant plating options, including electroless nickel and cadmium finishes, they prioritize environmental safety without compromising on performance. Suitable for wall and jam nut mounting, these connectors are ideal for aerospace, defense, and industrial sectors where ruggedness and reliability are paramount.