1. What is Screw Clamp Load?

Screw clamp load (F) is the axial force generated when torque is applied to a screw or bolt. It represents the clamping force that holds components together in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the screw clamp load formula:

Where:

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

Explanation: The formula calculates the axial clamping force generated based on the applied torque, screw diameter, and friction coefficient.

3. Importance of Clamp Load Calculation

Details: Accurate clamp load calculation is essential for ensuring proper joint integrity, preventing loosening, avoiding over-tightening, and maintaining structural stability in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in Newton-meters (Nm), coefficient value (typically 0.2 for dry steel), and diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value for screws?
A: For dry steel screws, K is typically around 0.2. Lubricated screws may have K values around 0.15-0.18.

Q2: Why is clamp load important?
A: Proper clamp load ensures joint integrity, prevents vibration loosening, and maintains the required preload for secure fastening.

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

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

Q5: Can this formula be used for all screw types?
A: This formula provides a general calculation. Specific screw types and applications may require more detailed engineering analysis.