Surface Finish Inspection

What is measured

Surface roughness where the drawing specifies it, typically on sealing faces, sliding surfaces, optical seats and any face where friction or sealing performance depends on finish.

How it is verified

Roughness is measured with a surface measuring instrument against the specified parameter, on the face the drawing names — not inferred from how the cut looked.

Why it matters

Finish drives sealing, friction and wear, and in clean applications it also drives how easily a surface releases particles. An unmeasured finish is a risk carried silently into the assembly.

Surface-finished appearance parts

Below are examples of this kind of work held to our standard tolerance and finish. Dimensions, drawings and material certificates are available on request.

Milled plate with a dense grid of small holes

Black coated enclosure with a large bore and a flat machined face

Turned steel bushings with stepped bores

Frequently asked questions

What roughness values can you achieve?

Down to Ra 0.2 µm, depending on material and geometry; the achievable value is confirmed per part.

Do you measure roughness or just cut carefully?

Where a value is specified, it is measured — a careful cut is good practice, a measurement is evidence.

Which surfaces need finish control?

Sealing faces, sliding and bearing surfaces, optical seats and any face where the drawing sets a roughness value.