This Aerospace Standard establishes the diameter - pitch combinations of ISO metric 60??crew threads recommended for use in the aerospace industry for metric module shaft or bearing retaining screw threads.
SAE AS1421A-2010 history
2010SAE AS1421A-2010 Aerospace Selected Diameter - Pitch Combinations of Metric 60 degrees Screw Threads for Shaft or Bearing Retaining Screw Threads
2006SAE AS1421-2006 Aerospace Selected Diameter - Pitch Combinations of Metric 60° Screw Threads for Shaft or Bearing Retaining Screw Threads
1976SAE AS1421-1976 Aerospace Selected Diameter - Pitch Combinations of Metric 60 Degree Screw Threads for Shaft or Bearing Retaining Screw Threads