1. What is the Tightening Torque Formula?

The tightening torque formula calculates the required torque for metric bolts based on the torque coefficient, axial force, and bolt diameter. It ensures proper bolt tension and prevents joint failure.

2. How Does the Calculator Work?

The calculator uses the tightening torque formula:

Where:

• \( T \) — Tightening torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Axial force (N)
• \( D \) — Bolt diameter (m)

Explanation: The formula calculates the torque required to achieve proper bolt tension while accounting for friction and other factors through the torque coefficient.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for ensuring proper bolt tension, preventing joint failure, and maintaining structural integrity in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.15-0.25), axial force in Newtons, and bolt diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For standard metric bolts, K typically ranges from 0.15 to 0.25, depending on surface finish and lubrication.

Q2: How do I determine the required axial force?
A: Axial force depends on the joint requirements and can be calculated based on the bolt's proof load or yield strength.

Q3: Why is accurate torque important?
A: Under-torquing can lead to joint loosening, while over-torquing can cause bolt failure or thread stripping.

Q4: Does lubrication affect torque calculation?
A: Yes, lubrication reduces friction and requires less torque to achieve the same clamping force. Always use the appropriate K value for lubricated conditions.

Q5: Can this formula be used for all bolt types?
A: This formula is primarily for metric bolts. Different standards may require adjustments for imperial or specialty fasteners.