Steel Coil Thickness Tolerance: International Standards Explained
Thickness tolerance is one of the most common disputes in steel trading. Different standards define different limits, and understanding them can save you money and prevent disputes.
1. Why It Matters
- You may receive thinner material than needed (structural concern)
- You are paying for weight you do not need (cost concern)
- Downstream processing may be affected
2. Hot-Rolled Coil Tolerance
| Thickness | ASTM A568 | EN 10051 | JIS G3193 |
|---|---|---|---|
| 1.2-2.0mm | ±0.12 | ±0.09 | ±0.10 |
| 2.0-2.5mm | ±0.14 | ±0.11 | ±0.12 |
| 3.0-5.0mm | ±0.18 | ±0.15 | ±0.16 |
3. Cold-Rolled Coil Tolerance
| Thickness | ASTM A1008 | EN 10130 | JIS G3141 |
|---|---|---|---|
| 0.3-0.6mm | ±0.03 | ±0.02 | ±0.03 |
| 0.6-1.0mm | ±0.05 | ±0.04 | ±0.04 |
| 1.6-2.5mm | ±0.09 | ±0.08 | ±0.08 |
4. Standard vs Tight Tolerance
- Standard (Class A): Values above. General applications.
- Tight (Class B): 50-60% of standard. Automotive, precision stamping. +2-5% cost.
5. How to Specify on Orders
- Nominal thickness with tolerance class
- Width and edge type
- Standard reference
- Ordered vs minimum guaranteed thickness
CoreMetal offers tight-tolerance coils. Every shipment verified before loading. Contact Tracy: tracy@coremetalsteel.com | +86 18291910632