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OpenSpecEngineering

Open data for a field built on precision

Bolt Torque & Preload

The short-form torque-preload relation T = K·F·d used for everyday bolted-joint tightening. K is the nut factor (~0.2 for non-plated steel fasteners, lower if lubricated/plated).

T F (preload)
Applied torque T develops axial clamping preload F through the nut factor K and diameter d.

Solution

History