The tolerance for the aluminum specimen (Type 6061-T6) are as follows:

 
 
  • 1/8" +/- 0.007"
  • 3/16" +/- 0.007"
  • 1/4" +/- 0.008"
  • 5/16" +/- 0.008"
  • 3/8" +/- 0.008"
  • 1/2" +/- 0.009"
  • 5/8" +/- 0.009"
  • 3/4" +/- 0.010"
  • 7/8" +/- 0.010"
  • 1" +/- 0.0012" (0.0012" is not an error as it was confirmed by the vendor)