Possibly the same material and/or grade of bolt- - - -the length and amount of stretch at the specified torque would probably be different. I can recall racing connecting rod bolts that came from the manufacturer with a "stretch" specification instead of a specific torque number. We would glue a small ball bearing into center-drilled holes on both ends of the bolt and tighten them until the specified amount of stretch could be measured with a micrometer. Some of them were 7/16" fine thread, and required 90+ ft/lbs of torque.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!