A forged coupling is a type of pipe fitting that is made by forging, a process that uses heat and pressure to shape metal. Forged couplings are typically made of steel, but they can also be made of other metals such as stainless steel, alloy steel, and copper. Forged couplings are stronger and more durable than other types of pipe fittings, such as threaded couplings. They are also less likely to leak. Forged couplings are used in a variety of applications, including water, gas, and oil pipelines, as well as in industrial and construction applications. Here are some of the technical specifications of forged couplings: Material: Steel, stainless steel, alloy steel, copper Class: 2000, 3000, 6000, 9000 Size: 1/8 to 4" End type: Socket weld, threaded, flanged Size: Typically available in sizes from 1/2 inch to 12 inches