CALCULATE WITH CONFIDENCE

Engineering · Machine Design

Fasteners, Joints and Power Screws Workbench Calculator

Calculate bolt-group load sharing, preload torque, threaded-screw torque and friction-joint resistance from entered geometry and coefficients.

Engineering · Machine Design

Enter the engineering model

Explicit properties, geometry, units and assumptions
Visual modelSchematic · not to scale
Machine Design: preload visual explanationA simplified diagram showing the relationship represented by the selected calculator mode. It is explanatory and not a fabrication, safety or scale drawing.clamp force through a jointfastener load path
The diagram explains the selected relationship only. Dimensions, symbols and proportions are illustrative; use the entered values and stated assumptions for the calculation.

Keep every unit basis, sign convention, property source and idealization consistent. Values stay in this browser.

Engineering calculation result

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Enter valid values to see the result.

Your entries are calculated in this browser and are not submitted to 365CALCS.COM.

Quick guide

How to use this calculator

  1. Choose the analysis mode that matches the physical model before entering values.
  2. Enter properties, geometry, loads, states and coefficients from one consistent unit and sign convention.
  3. Use the intermediate outputs to audit the relationship, then retain the stated idealization before applying it.

Calculation method

Transparent engineering model

Bolt torque T=KFd; power-screw raising torque uses T=F(dm/2)(1+πμdm/L)/(1−πμdm/L); friction resistance=μN.

The calculator evaluates only the declared relationship and preserves visitor-entered assumptions rather than selecting materials, factors, components or standards.

Worked example

Worked example

A 20 kN preload, 10 mm bolt and nut factor 0.2 correspond to 40 N·m before real joint scatter.

Bolt torque T=KFd; power-screw raising torque uses T=F(dm/2)(1+πμdm/L)/(1−πμdm/L); friction resistance=μN.

Supported inputs

Precision and limits

Analysis, not approval

Joint arithmetic is not a tightening specification. Thread form, lubrication, embedment, gasket behavior, separation, fatigue and standards require qualified design inputs.

Standards and properties

Material properties, allowable values, load combinations, safety factors, correlations, manufacturer data, codes and jurisdictional requirements are not supplied automatically.

Units and precision

Use one consistent unit basis. Results retain working precision but cannot be more accurate than the entered measurements and properties.

Privacy

Entered engineering values and results stay in this browser and are not sent to analytics or third parties.