Flange coupling involves bringing the two tube ends together in a flush, sealed manner. The two-piece coupling unit consists of a keyed receiving side for the flanged end to be fastened. The reason being it may be married to the opposing tube end, which also has a flanged end. Most flange coupling assemblies have either a female or male coupler opening so that when the two ends are brought together, they are aligned without causing drag or resistance in the material being passed through them. The female or male coupling method also creates a stable connection, resistant to shifting, keeping the flange coupling sturdily in place. A flange coupling is useful in pressurizing the piping systems where tubing ends or two pipes need to come together. The connecting methods for flange couplings are usually quite strong. The reason is either the pressure of the material or the sometimes hazardous nature of the materials passed through many industrial piping systems. Bolt connections and high thread count nut are used to securing the flange coupling place. These bolts and nuts are usually made from tempered alloys or steel to provide the enduring strength and ability to tighten to the utmost level and ensure that the piping system doesn’t leak at any flanged junction.