Dimensional Tolerance Calculator
Dimensional Tolerance Calculator (ASTM, EN & ISO Quick Check)
Check indicative tolerance bands for thickness, width, and length—useful for RFQs, inspection planning, and supplier discussions.
Tolerance Band & Allowed Range
Results are for quick reference. For acceptance criteria, always confirm the latest official standard and your purchase order/specification.
Tolerance (+ / −)
—
Allowed range
Nominal — · Min — · Max —
Standard note
Enter a nominal size to see the tolerance band.
Why Dimensional Tolerance Matters in Steel Purchasing
In international steel procurement, “nominal size” is the target—but every mill produces within an allowable band. A tolerance check helps you avoid two costly mistakes: rejecting material that is actually within standard, or accepting material that is too thin, too narrow, or too short for your application.
At LYHSteel, we recommend confirming tolerances early—during RFQ and before production—especially for projects involving cutting, welding, fit-up, and downstream fabrication.
What This Calculator Does
This tool provides a fast, visual tolerance estimate for thickness, width, or length. You can select a reference framework (ASTM / EN / ISO), choose a process or tolerance class, then view the tolerance band and the allowed size range.
| Standard (Reference) | Typical Use | Good For | Notes |
|---|---|---|---|
| ASTM A480 (Indicative) | Stainless plate & sheet | Thickness / width / length checks in ASTM-style purchasing | Use as a discussion baseline; confirm exact tables with official documents. |
| EN 10051 (Indicative) | Hot-rolled strip/sheet | Hot rolled tolerance conversations | Hot rolled usually carries larger tolerances than cold rolled. |
| EN 10088 (Indicative) | Cold-rolled stainless strip/sheet | Cold rolled thickness & width expectations | Cold rolled typically offers tighter bands—verify per grade and finish. |
| ISO 2768-1 | General linear tolerances | Fabrication drawings, cut lengths, general dimensions | Classes: f (fine), m (medium), c (coarse), v (very coarse). |
How LYHSteel Supports Dimensional Control
If your project requires a tighter band, the best approach is to align tolerance requirements with the product form, process route, and inspection method upfront. LYHSteel can support sourcing for flat products such as stainless steel sheet & plate and stainless steel strip/coil, plus downstream services like slitting and laser cutting.
FAQ
Q1: Can I use this calculator for final acceptance or disputes?
No. This is a quick-check tool for RFQs and discussions. For acceptance, rely on the latest official standard, the PO, and any agreed customer specification.
Q2: Why do width/length often show “plus” tolerance and near-zero minus?
Many flat products are allowed to be slightly over nominal but not under nominal, to protect buyers from receiving material that is too narrow or too short.
Q3: What if my drawing specifies special tolerances?
Use the calculator to sanity-check feasibility, then confirm special tolerances with your supplier and inspection plan before production.
Related reading: sourcing and specification planning for stainless steel flat products is available on LYHSteel’s product pages and technical articles.
