Historical
SAE AS 1421-1976 (SAE AS1421-1976)
Aerospace Selected Diameter-Pitch Combinations of Metric 60~ Screw Threads, for Shaft or Bearing Retaining Screw Threads ( Reaffirmed: Mar 1982 Jul 1991 May 1995 Oct 2001 May 2006 )
Content Provider
Society of Automotive Engineers [sae]