Standard Speciﬁcation for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing1

This preferred is issued below the ﬁxed designation a 513; the number immediately following the designation indicates the yr of authentic adoption or, in the case of revision, the year of final revision. A number of in parentheses shows the year of remaining reapproval. A superscript epsilon (e) indicates an article change for the reason that remaining revision or reapproval.
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