A hardy in the hardy hole of an anvil. A bending fork lies next to it with its square shank clearly visible.
Hardy tools, also known as anvil tools or bottom tools, are metalworkingtools used in anvils. A hardy has a square shank, which prevents it from rotating when placed in the anvil's hardy hole. The term "hardy", used alone, refers to a hot cutting chisel used in the square hole of the anvil. Other bottom tools are identified by function. Typical hardy tools include chisels and bending drifts. They are generally used with a matching top tool.
Different hardy tools are used to form and cut metal. The swage is used to make metal round for final use as nails, bolts, rods or rivets. The fuller is used to help bend metal, and make dents and shoulders. Many hardy shapes have corresponding hammer shapes to help form metal, for example a "V"-shaped fuller is used with an inverted "V"-shaped hammer to form iron into an angle shape.