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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Converting RA to UIN

I have a vendor who has a surface requirement of 50 micron max, he is reporting his results in 0.118 UIN. I need to report this to my customer in microns. They do not understand UIN?

Tracy McKenrick
Fasteners - Allentown, Pennsylvania, USA
2007

2007

Tracy,

Don't mind admitting that I am not that up on surface roughness measurements but something doesn't look right with your figures (or is it me just being a bit thick).

When you say 50 micron finish do you mean 50 microinches? 50 micrometer finish would be rougher than a badgers behind!

I would guess that µin actually stands for microinch (U for micro, IN for inch), if it is then you have something heading toward a mirror finish.

Brian Terry
Aerospace - Yeovil, Somerset, UK

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