MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. These thin-walled, restricted length connectors come in various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts. Constructed with aluminum shells, they offer plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. The MS27472 connectors, part of the 38999 Series II, are known for their durability and reliability in military and industrial applications, featuring gold-plated contacts, bayonet coupling, and a maximum operating temperature of 175°C.