Standard Test Method for
Measuring Groove and Void Depth in Passenger Car Tires1
This standard is issued under the fixed designation F 421; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
Click below to download Astm F 421 – 00 Pdf free
[wpdm_package id=’41202′]
Click here to Astm F 420 – 99 (Reapproved 2003) Pdf free download