Historical
SAE AS 7252-1991 (SAE AS7252-1991)
Nuts, Self-Locking, Steel High Strength, All Metal 450 \mDF Use, UNJ Thread Form ( Reaffirmed: May 1995 Oct 2001 May 2006 )
This specification covers all metal, self-locking wrenching nuts, plate nuts, shank nuts, and gang channel nuts made of a carbon or low alloy steel. For use up to approximately 450 degrees F where high strength nuts with UNJ thread form are required.
Society of Automotive Engineers [sae]