Theoretical vs Actual Steel Weight
Catalog and handbook kg/m values are theoretical. Actual weight varies with mill tolerance, fillet radii, and length measurement. For procurement, agree whether quotes use theoretical or weighed mass.
Reference values
- Catalog values
- Theoretical / nominal
- Scale weight
- Actual delivered mass
- Best practice
- State basis on quotes and POs
Key differences
Theoretical kg/m
From standard tables assuming nominal dimensions.
Mill tolerance
Thickness and depth may vary within standard limits.
Scale weight
Includes packaging, scale calibration, and cut length.
Contract basis
Specify theoretical vs actual in PO lines.
Typical variance
Structural sections often within ±2–4% of theoretical; confirm your standard.
FAQ
EN vs ASTM tables?
Profile dimensions and kg/m differ by standard — use the matching catalog family.
Who wins on disputes?
Follow contract: theoretical billing vs weighbridge is common in steel trade.