Why the MSS SP 55 is so famous surface quality of steel part ?

[stanislasdz]

Many peoples or campanies refers to this paper why it's so famous

Stanislas

 

[Pressed]

To help define " unacceptable visual surface discontinuities, " the ASTM specifications state that " Visual Methods MSS-SP-55 ", which is issued by the Manufacturers Standards Society of the Valve and Fittings Industry, may be used. This standard contains photographs of various casting surfaces and defines them as acceptable or unacceptable.

[URL unfurl="true"]http://www.sfsa.org/sfsa/buyrord3.html[/URL]

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