Designation: F436M - 11 Standard Speci?cation for Hardened Steel Washers (Metric) 1 This standard is issued under the ?xed designation F436M; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of last reapproval. A superscript epsilon (′) indicates an editorial cha