Calculators & Converters

Tightening Torque and Preload with Nut Factor and Tool Accuracy (Inch)

Calculate tightening torque and preload with nut factor for imperial screws. The calculator considers your tool accuracy and scatter on preload for higher certainty of joint integrity.

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The calculator is based on the formula T = K × Fmean × d, where (T) is the tightening torque, (K) is the nut factor, (d) is the nominal diameter of the bolt, and (Fmean) is the preload, depending on wrench accuracy. The nut factor K accounts for various factors such as materials, surface finishes, plating, coatings, and lubricants.

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