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The mathematical relationship between torque applied and the resulting tension force in the bolt has been determined to be as follows:
T = Torque required (inch pounds) F = Bolt tension desired (Axial Load) (pounds). D = Nominal bolt diameter. (major dia.) EQUATION: T = .2 D F
This relationship is based on the assumption that regular series nuts and bolts with rolled threads are used, acting on surfaces without lubrication.