Historical
SAE ARP 373B-1963 (SAE ARP373B-1963)
Propeller Shaft Torque Ratings ( Reaffirmed: Feb 1984 Jul 1991 May 1995 Nov 2001 Oct 2006 )
The following table shows the recommended allowable ratings for propeller shaft ends for low horsepower engines. Ratings are based on the formula: ALLOWABLE RATING = RATED TAKE-OFF PROPELLER SHAFT TORQUE IN FOOT POUNDS X CYLINDER BORE IN INCHES.
Society of Automotive Engineers [sae]