1. What is Metric Bolt Clamp Load?

Metric bolt clamp load refers to the axial force generated in a bolt when it is tightened to a specified torque. This force is crucial for maintaining joint integrity and preventing loosening under operational conditions.

2. How Does the Calculator Work?

The calculator uses the clamp load formula:

Where:

• \( F \) — Clamp load (N)
• \( T \) — Applied torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( D \) — Bolt diameter (m)

Explanation: The formula calculates the axial force generated in a bolt based on the applied torque, bolt diameter, and friction coefficient.

3. Importance of Clamp Load Calculation

Details: Proper clamp load calculation is essential for ensuring joint integrity, preventing bolt failure, and maintaining safety in mechanical assemblies. Insufficient clamp load can lead to joint separation, while excessive load may cause bolt yielding or fracture.

4. Using the Calculator

Tips: Enter torque in Newton-meters (Nm), torque coefficient (typically 0.15-0.25 for lubricated bolts), and bolt diameter in meters. All values must be positive and valid.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For lubricated steel bolts, K is typically 0.15-0.25. For dry or plated surfaces, it can range from 0.20-0.35.

Q2: Why is clamp load important in bolted joints?
A: Clamp load maintains joint integrity, prevents loosening under vibration, and ensures proper sealing in gasketed joints.

Q3: How does bolt diameter affect clamp load?
A: Larger diameter bolts require more torque to achieve the same clamp load due to the increased leverage effect.

Q4: What factors affect the torque coefficient?
A: Surface finish, lubrication, thread pitch, and material properties all influence the torque coefficient value.

Q5: Can this formula be used for all bolt types?
A: This formula is generally applicable for standard metric bolts, but specialized fasteners may require specific calculations.