1. What is the Clamp Load Formula?

The clamp load formula calculates the axial force (F) generated by a torque (T) applied to a fastener, considering the friction coefficient (K) and the fastener diameter (D). This is essential for proper bolt tensioning in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the clamp load formula:

Where:

• \( F \) — Clamp load (N)
• \( T \) — Applied torque (Nm)
• \( K \) — Coefficient of friction (dimensionless)
• \( D \) — Fastener diameter (m)

Explanation: The formula calculates the axial force generated when torque is applied to a fastener, accounting for friction and geometric properties.

3. Importance of Clamp Load Calculation

Details: Accurate clamp load calculation is crucial for ensuring proper joint integrity, preventing bolt failure, and maintaining safety in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in Nm, coefficient of friction (typically 0.1-0.3 for lubricated threads), and diameter in meters. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for bolts?
A: For lubricated steel bolts, K is typically 0.15-0.20. For dry threads, it can be 0.20-0.30.

Q2: Why is clamp load important?
A: Proper clamp load ensures joint integrity, prevents loosening, and maintains the designed preload in bolted connections.

Q3: How does diameter affect clamp load?
A: Larger diameters require more torque to achieve the same clamp load, as force is distributed over a larger area.

Q4: What factors affect the K coefficient?
A: Surface finish, lubrication, thread type, and material properties all influence the friction coefficient.

Q5: Is this formula applicable to all fastener types?
A: The formula works best for standard threaded fasteners. Special fasteners may require modified calculations.