Standard Specification for Steel Bars and Shapes, Carbon Rolled from “T” Rails1

This well-known is issued under the fixed designation a 499; the number right now following the designation suggests the 12 months of authentic adoption or, in the case of revision, the year of final revision. Quite a number in parentheses indicates the year of last reapproval. A superscript epsilon (e) shows an article change for the reason that closing revision or reapproval.

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