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The following are eight metal bending terms:

Arc- The portion of the metal that is curved. This could be a steel beam, a tube, a pipe, a square tube or even sheet metal.

Chord- A line segment that joins two points on a curve. In our case from one end of the arc to the other end of the arc.

CLR- Centerline radius of the rolled shape.

Degree- Indicates the size of the spiral stair.

Equal Tangent- When the straight portions at each end of an arc are equal. (Also see Tangent.)

Good Arc- The portion of the steel or other metal that is curved to the required radius.

Hot Forming- Heated metal is formed around a die. Some applications may not allow heat. Hot Forming allows for bending steel tighter than otherwise impossible.

 Landing- The intermediate platform on a flight of stairs or the area at the top or bottom of a staircase.