Bolt Friction Coefficient Calculator

This calculator determines the bolt friction coefficient based on bolt pretension, coefficient of friction, and yield strength. It's useful for engineers working on fastener systems and mechanical assemblies.

Input Parameters

Calculation Results

Friction Coefficient (μ)

0.00

The friction coefficient is calculated based on bolt pretension, yield strength, and coefficient of friction.

Calculation Formula

μ = (P × μ₁) / (A × σy)

Where:
μ = Friction coefficient
P = Bolt pretension (kN)
μ₁ = Coefficient of friction
A = Bolt cross-sectional area (mm²)
σy = Bolt yield strength (MPa)

Bolt Friction Coefficient Calculator Usage Guide

Learn how to use the Bolt Friction Coefficient Calculator and its working principles

How to Use the Calculator

  1. Enter the bolt pretension in kilonewtons (kN)
  2. Enter the bolt yield strength in megapascals (MPa)
  3. Enter the coefficient of friction (typically between 0 and 1)
  4. Click the "Calculate" button to compute the friction coefficient

Understanding the Formula

The friction coefficient (μ) is calculated using the formula:

μ = (P × μ₁) / (A × σy)

Where:

  • P is the bolt pretension (kN)
  • μ₁ is the coefficient of friction
  • A is the bolt cross-sectional area (mm²)
  • σy is the bolt yield strength (MPa)

Practical Applications

This calculator is useful in various engineering applications including:

  • Designing bolted joints in machinery
  • Calculating clamping forces in fastener systems
  • Evaluating the effectiveness of locking devices
  • Optimizing assembly processes in manufacturing