Wall Thickness (WT)
/glossary/wall-thicknessThe radial thickness of pipe material determining strength, weight, and pressure capacity.
In detail
Wall Thickness (WT) is the radial distance between the inner and outer surfaces of a pipe, measured in millimeters or inches. It is the primary determinant of a pipe's pressure rating, structural strength, and weight per meter. Indian standards define light, medium, and heavy classes by wall thickness ranges. For seamless pipes, wall thickness tolerance is typically +15%/-12.5%, while precision tubes may achieve ±7.5% or tighter. WT must be specified alongside OD for complete pipe specification.
Where you'll meet this in procurement
You will meet Wall Thickness (WT) on size charts, mill quotes, and fitment checks. Cross-check Wall Thickness (WT) against OD, wall thickness or schedule, length, and end finish so the delivered pipe matches flanges, fittings, and pressure duty—not just a familiar nominal label.