MIL-DTL-38999 Series I connectors feature up to 128 contacts enclosed in an environmentally sealed insert, designed for harsh operating conditions with a wide temperature range of -65°C to 200°C. The connector family includes front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts, offering versatility in contact sizes. Constructed with high-strength aluminum shells and various plating options, including RoHS-certified finishes, they ensure reliable performance in demanding environments. The MS27468 model specifically is a jam nut mounting receptacle with 19 gold-plated contacts (size 12), mating through bayonet coupling. With electroless nickel and cadmium olive drab coatings, it provides durability and conductivity, suitable for applications requiring environment resistance. The connector's service class rating of I underscores its reliability, with a service class detail specifying its application in wall and jam nut mounting receptacles and plugs.