ASTM-F421 Complete Document History
Standard Test Method for Measuring Groove and Void Depth in Passenger Car Tires

Complete Current Edition:
   2015 R21 EDITION - REAPPROVED IN 2021 - April 22, 2021

Obsolete Revision Information:
   2015 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Aug. 15, 2015
   2007 R13(E1) EDITION - REAPPROVED IN 2013, EDITORIALLY CORRECTED - Dec. 1, 2013
   2007 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Aug. 1, 2007
   2000 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - May 10, 2000
   1995B EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Oct. 10, 1995
   1995A EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Sept. 10, 1995
   1995 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Aug. 15, 1995
   1989 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - Sept. 29, 1989
   1982 EDITION - Measuring Groove and Void Depth in Passenger Car Tires - March 26, 1982