Gunmetal is an alloy of copper, tin and zinc also known as bronze, which casts and machines well and is resistant to corrosion from steam and salt water and therefore it, is used to make steam and hydraulic castings, valves, gears, statues, and various small objects. There are several types of bush bearings viz brass, bronze, self-lubricated oil, graphite etc. lubricant impregnated bearings and bi-metal and Babbitt bearings. Bronze, Gun metal bushing, Phosphor Bronze, Aluminum Bronze, etc. are widely used in Submersible Thrust Bush and Earth Moving Bushing are manufactured using quality metal and alloys such as brass, bronze and gunmetal. To ensure quality, special compositions are chosen for bush bearings that can be either procured from local foundries or the unit can have its own foundry.