Bolt Pull Out Force Calculator

This calculator determines the pull-out force required to extract a bolt from a material, considering factors like bolt diameter, friction coefficient, and embedded depth.

Input Parameters

Calculation Results

Calculation Formula

Pull-Out Force (F) = π × D × μ × (d × τ) + (π × D² × τ)/4

Where:
F = Pull-Out Force (N)
π = Pi (3.14159)
D = Bolt Diameter (mm)
μ = Friction Coefficient
d = Embedded Depth (mm)
τ = Shear Strength of Material (MPa)
Note: The first term represents friction-based resistance, and the second term represents shear resistance.

Calculated Pull-Out Force:

N

Bolt Pull Out Force Calculator Calculator Usage Guide

Learn how to use the Bolt Pull Out Force Calculator and understand its working principles

How to Use This Calculator

  1. Enter the Bolt Diameter in millimeters (mm).
  2. Enter the Friction Coefficient (typically between 0 and 1, depending on materials).
  3. Enter the Embedded Depth in millimeters (mm) - the depth the bolt is embedded in the material.
  4. Enter the Shear Strength of Material in megapascals (MPa) - the material's resistance to shear force.
  5. Click the Calculate button to compute the pull-out force.
  6. The result will be displayed in newtons (N). Use the Reset button to clear all inputs.

Understanding the Formula

The calculator uses the following formula to determine the pull-out force:

F = π × D × μ × (d × τ) + (π × D² × τ)/4

This formula accounts for two main resistance mechanisms:

  • Friction-based resistance: Proportional to bolt diameter, friction coefficient, and embedded depth.
  • Shear resistance: Proportional to bolt diameter and material shear strength.

Applications

This calculator is useful in engineering fields such as:

  • Mechanical design and analysis
  • Fastener selection and verification
  • Installation procedure planning
  • Failure prevention in bolted joints

Note: This calculator provides a theoretical estimate. Actual forces may vary based on material properties, surface finish, and installation quality.