Specifies a) tolerances for the thickness of the web and the flanges along with a higher mass tolerance given in table 8, column 3 (symbol D for dimensional tolerance), or b) where no tolerances are specified for the thickness of the web and the flanges, tighter mass tolerances given in a table 8, column 2, are applicable (symbol M for mass tolerance).
ISO 657-13:1981Stage: 95.99
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