ASME-B18.2.1 Complete Document History
Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series)

Complete Current Edition:
   2012 EDITION ERRATA 2 - 2012 EDITION WITH ERRATA 2 INTERFILED - Jan. 1, 2021

Obsolete Revision Information:
   2012 EDITION ERRATA - ERRATA FOR 2012 EDITION - July 29, 2013
   2012 EDITION - Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and Lag Screws (Inch Series) - April 4, 2013
   2010 EDITION - Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy - Oct. 13, 2010
   1996 EDITION ERRATA - ERRATUM TO 1996 EDITION - July 1, 2003
   1996 EDITION ADDENDA A - ADDENDA A TO 1996 EDITION - Oct. 8, 1999
   1996 EDITION - REAFFIRMED IN 2005 - July 29, 1997