Stainless Thickness Tolerance: ASTM A480 vs EN 10088-2
A nominal “1.5 mm” sheet is allowed to deviate within the standard’s tolerance range, and mills may sit at the low end. ASTM A480 and EN 10088-2 define different tolerances, so buyers should specify the standard, the acceptance range and the measurement method — not only the nominal thickness.
| Item | ASTM A480 | EN 10088-2 |
|---|---|---|
| Scope | US standard for flat-rolled stainless | European standard for flat products |
| Tolerance basis | Thickness range bands | Thickness and width bands |
| Buyer action | State standard + acceptance range + measurement point | State standard + acceptance range + measurement point |
Why weight and price differ from the nominal figure
theoretical weight uses nominal thickness; actual delivered weight may differ within tolerance, which affects cost per square metre.
What to write on the PO
“Thickness 1.5 mm, tolerance per EN 10088-2, measured at 50 mm from edge, acceptance 1.45–1.55 mm” (example).
When tight tolerance matters
welded assemblies, load-bearing parts, precision stamping, automated handling lines.
FAQ
- Can a 1.5 mm sheet legally be 1.35 mm?
- Some standards allow a negative deviation in that range depending on width and thickness band; the buyer should specify the acceptance range explicitly.
- Which standard should EU buyers use?
- EN 10088-2 is the common reference for EU projects; US projects typically reference ASTM A480/A240.
- How is thickness measured?
- With a calibrated micrometer at defined points; define the measurement location and instrument in the purchase order to avoid disputes.
More guides
Ask for a sample MTC and thickness check on your target size.