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

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Assistance for Ra

I have a metric customer requesting a finish of RA-08. for a aluminum section (spacer plate) for a project. What is an US equivalent or do you think he means Ra-8

Thanks,

Len Phillips
- Oak Ridge , Tennessee, USA
2003

I don't recognize the use of that reading as standard data; however, to play it safe, I suggest you call the customer to verify.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2003

Your customer probably meant Ra=0.8 micrometers, which (multiplied by 40) corresponds to a Ra=32 microinches.

Giovanni M. Ciriani
promotions - Altavilla, VI, Italy
2003

I thought Ra was measured in exclusively in microinches and not in micrometers? I agree with the earlier post, when in doubt ask the customer.

Michael Liu Taylor
specialty stainless steel distributor - Dallas, Texas
2003

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