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topic 3709

Info about unusual surface roughness symbols


Q. Respected Sir,

I require some detail information about the surface finish symbol shown below:


It is 2.9 MM thk. and 60 MM wide. There are slots of 2.95 MM width at an angle of 30 degrees each at a pitch of 26 MM. The dimensions are according the DIN standards. The term "1.5/Pt 25" has to be understood.

I was really happy to get some interest for my topic. Looking forward for your co-operation.

Thanking You,

Yours Sincerely,



A. The American National Standard ANSI/ASME Y14.36 [link by ed. to spec at TechStreet] establishes the profile for surface textures. The roughness sampling length is placed below the horizontal extension.

Bruce Solana
- Panama City, Florida


Q. I have a drawing of a cast steel component. One of the drawing notes contains a finishing mark I have never seen before. This mark starts with the Roman numeral III followed by the check-shaped finishing mark. The entire note reads: III(check-mark)Surface Quality per 2A 296-1004. What does this mean?

Thank you.

John Bauchat
- Milford, New Hampshire, USA


Q. We have a customer drawing that specifies 1.0 Finish mark, and under the mark it reads 0.4 / Rt 6.3 with a "C" under the 0.4

What do all these numbers and letters mean?

John Smoyer
job shop employee - Jackson, Michigan

March 14, 2009

Q. We have a customer drawing that specifies:

"0.9/Pt6" above the Finish mark

What do all these numbers and letters mean?

Appreciate your response.

Zhu Jinghong
- Singapore

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