Common Tube Bending Terms
Arc - The curved portion of tube rolling or pipe rolling bends.
Bevel - A type of end preparation of tube rolling or pipe rolling bends.
Centerline Radius (CLR) - Distance in inches from the center of curvature to the centerline axis of the tube rolling or pipe rolling bends. Abbreviated as CLR.
Cold Tube Bending - The bending of pipe or shapes by cold working methods.
Degree - Angle in degrees to which the pipe rolling bends are formed (i.e. 45 degrees, 90 degrees, 180 degrees, etc.).
Easy Way (EZ) - Bending of a rectangular tube with its short side in the plane of the tube rolling or pipe rolling bend.
Grade - Manufacturers' specification of material types of pipe or tubes, (i.e. A53B, T304W SS).
Hard Way (HW) - Bending of a rectangular tube with its long side in the plane of the tube rolling or pipe rolling bend.
I.D. - Inside diameter of the tube rolling or pipe rolling bends.
Minimum Tangent - The minimum straight on the end of pipe rolling bends required by the bending machine to form the bend.
Neutral Axis - That portion of the pipe or tube that is neither in compression or tension.
O.D. - Outside diameter in inches of the tube rolling or pipe rolling bends.
Out of Plane - The deviation of the horizontal plane of a single pipe bend between its tangent points, based on the theoretical center-line of the pipe rolling bend.
Ovality - The distortion or flattening of pipe or tube from its normal, round shape caused by the pipe bending process.
Plain End - Square cuts made prior to pipe bending with no intended exact tangent length.
Roll Past - Small amount of arc bent beyond a specified degree.
Rough Cut - Ends cut with an acetylene torch or arc gauge, ends are not required to be straight.
Square Cut - Cuts made square to the tangent of pipe rolling bends after the pipe bending process.
Tangent - The straight portion of material on either side of arc of rolling bends. See Pipe Bending and Pipe Rolling Diagrams.
Tangent Point - The point at which the bend starts or ends. See Pipe Bending and Pipe Rolling Diagrams.
Taper Bore - Material milled or ground out of the inside diameter tangent end of pipe rolling bends to create a different wall than the original thickness.
Wall - The thickness in inches of tubular pipe bending material.
Wrinkles - Waving or corrugation of pipe rolling bends in the inner radius.
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