Standard Speciﬁcation for Alloy-Steel Bolting Materials for Special Applications1
This well-known is issued below the ﬁxed designation a 540/a 540m; the wide variety straight away following the designation indicates the 12 months of unique adoption or, inside the case of revision, the 12 months of ultimate revision. A variety of in parentheses suggests the year of ultimate reapproval. A superscript epsilon (e) indicates an article trade because of the remaining revision or reapproval.
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