---
title: RA Finishes
description: We are able to measure and certify in both Ra and Rz and can work to minimum or maximum values, as well as specific ranges.
---

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# RA Finishes

Ra means roughness average and it is the universally recognised and most used parameter when it comes to measuring the surface of stainless steel and other metals. It is the arithmetic mean of the departures of the profile from a ‘mean’ or ‘centreline’ and is usually displayed in microns (µm), often with a maximum or minimum requirement such as <0.5µm. In plain English, it measures the peaks and valleys of the surface and gives the average between the two. Other measured finishes such as Rz are also available.

![pps ra finishes ](https://www.professionalpolishing.co.uk/hubfs/pps%20ra%20finishes%201x1.jpg "pps ra finishes ")

## RA Finishes

We are able to measure and certify in both Ra and Rz and can work to minimum or maximum values, as well as specific ranges.

With all Ra Finishes measured and certified you can be confident in the finish received.

[Contact us](https://www.professionalpolishing.co.uk/contact)

## Trusted in these sectors

Pharmaceutical | Nuclear | Architectural | Marine | Defence | Food & Beverage

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![alfed](https://www.professionalpolishing.co.uk/hs-fs/hubfs/alfed.webp?width=300&height=225&name=alfed.webp)

![pps british stainless (1)](https://www.professionalpolishing.co.uk/hs-fs/hubfs/pps%20british%20stainless%20(1).webp?width=300&height=225&name=pps%20british%20stainless%20(1).webp)

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## Transform Ordinary to Extraordinary

Request Your Free Sample Pack of Stainless Steel, Aluminium or Brass Polished Finishes

[Request Sample Pack](https://www.professionalpolishing.co.uk/free-sample-pack)

[N5 An abrasive finish with unidirectional grain to achieve a nominal Ra of 0.4µm.](https://professionalpolishing.co.uk/finishes/nuclear-finishes/n5/)

[N6 An abrasive finish with unidirectional grain to achieve a nominal Ra of 0.8µm within a range of 0.6µm > 1.2µm. All finishes are measured and certified.](https://lpd-themes.com/growfast/)

[N7 An abrasive finish with unidirectional grain to achieve a nominal Ra of 1.6µm within a range of 1.2µm > 2.4µm. All finishes are measured and certified.](https://lpd-themes.com/growfast/)

[N8 An abrasive finish with unidirectional grain to achieve a nominal Ra of 3.2µm within a range of 2.4µm > 4.8µm. All finishes are measured and certified.](https://lpd-themes.com/growfast/)

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