We don’t provide Ra or surface roughness specs for our materials because finishes can vary by supplier and batch. If no finishing service is added, your parts will ship with the standard mill finish, which may include light scratches.
Why we don’t list Ra specs
To keep costs low, we source materials from different suppliers. This means the mill finish surface roughness can vary. Since there’s no consistent Ra value across all batches, we can’t provide an exact specification.
What you’ll get without finishing
- Parts ship with the mill finish from the supplier
- Light scratches or handling marks are possible
- This is normal for uncoated sheet metal
How to request mill finish parts
When ordering, choose No finish (fastest option) at the Add Finishing step in our instant pricing system before adding the parts to your cart.
Want a smoother or more consistent finish?
Add one of our finishing services — such as powder coating or anodizing — to your order for a more uniform surface appearance.
Need help?
If surface finish is critical to your project, contact our Support team before ordering. We can help you choose the best combination of material and finish for your needs.