1. What is the Clamping Force Formula?

The clamping force formula calculates the axial force generated by a bolt when a specific torque is applied. This force is critical for ensuring proper joint integrity in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the clamping force formula:

Where:

• \( F \) — Clamping force (N)
• \( T \) — Applied torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( D \) — Nominal bolt diameter (m)

Explanation: The formula relates the applied torque to the resulting clamping force, accounting for the bolt diameter and friction through the torque coefficient.

3. Importance of Clamping Force Calculation

Details: Accurate clamping force calculation is essential for proper bolt tensioning, preventing joint failure, avoiding over-tightening, and ensuring structural integrity in mechanical designs.

4. Using the Calculator

Tips: Enter torque in Nm, torque coefficient (typically 0.15-0.25 for standard conditions), and nominal bolt diameter in meters. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical value for the torque coefficient K?
A: For standard conditions with lubricated threads, K is typically between 0.15-0.25. Dry or poorly lubricated threads may have higher values.

Q2: Why is clamping force important in bolted joints?
A: Proper clamping force ensures the joint remains tight under operating conditions, prevents loosening, and maintains seal integrity in pressurized applications.

Q3: How does bolt diameter affect clamping force?
A: Larger diameter bolts require more torque to achieve the same clamping force, as the force is inversely proportional to diameter in this formula.

Q4: What factors affect the torque coefficient K?
A: Thread condition, lubrication, surface finish, and material pairing all significantly affect the torque coefficient value.

Q5: Is this formula accurate for all bolt types?
A: This formula provides a good estimate for standard bolts but may need adjustment for specialized fasteners or extreme conditions where additional factors come into play.