What is the standard tolerance on length for ordinary cutting?

+100 mm to -25 mm for sections up to 12 meters.

What is the permissible weight tolerance for hot rolled I-beams?

± 2.5% of the calculated weight.

Does this standard cover out-of-squareness?

Yes, out-of-squareness tolerances are specified for various cross-sections, usually around 1 degree or specified in mm for flange tilt.

Are structural plates covered in this code?

Yes, Clause 9 details specific length, width, and thickness tolerances for hot rolled structural plates.

IS 1852

: 1985

Rolling and Cutting Tolerances for Hot Rolled Steel Products

CurrentFrequently UsedSpecificationStructural Engineering · Steel and Reinforcement

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This standard prescribes the rolling and cutting tolerances for hot-rolled steel sections, including beams, channels, angles, plates, and bars. It defines the permissible variations in weight, dimensions, and straightness to ensure structural integrity and fit-up accuracy during fabrication.

Specifies rolling and cutting tolerances for various hot rolled steel products like plates, sheets, sections, and bars.

Quick Reference Values

weight tolerance beams channels± 2.5%

weight tolerance angles± 5% (up to 3mm thick), ± 2.5% (over 3mm)

length cutting tolerance ordinary up to 12m+ 100 mm, - 25 mm

length cutting tolerance exact up to 12m± 3 mm

web thickness tolerance beams under 125mm± 0.5 mm

flange width tolerance beams under 125mm± 2.5 mm

plate length tolerance+ 25 mm, - 0 mm

Practical Notes

Always check rolling tolerances before rejecting steel on-site, as slight dimensional deviations are often strictly within code limits.

Weight tolerances are typically applied to a batch or standard length rather than a single short piece.

If precise lengths or tight tolerances are required for a specific fabrication process, they must be mutually agreed upon with the manufacturer prior to ordering.