1. What is the Clamp Load Formula?

The clamp load formula calculates the axial force generated when torque is applied to a fastener. It's essential for determining the clamping force in bolted joints, which affects joint integrity and safety.

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)
• \( D \) — Nominal diameter (m)

Explanation: The formula relates the applied torque to the resulting axial force, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Clamp Load Calculation

Details: Proper clamp load calculation is crucial for ensuring joint integrity, preventing fastener failure, and maintaining safety in mechanical assemblies. It helps determine if a joint will remain secure under operational loads.

4. Using the Calculator

Tips: Enter torque in Nm, torque coefficient (typically 0.15-0.25 for standard fasteners), and nominal 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 unlubricated steel fasteners, K is typically between 0.15-0.25. Lubricated fasteners may have values as low as 0.10.

Q2: Why is clamp load important in bolted joints?
A: Proper clamp load ensures the joint remains tight under vibration and prevents loosening, leakage, or fatigue failure of the fastener.

Q3: How accurate is this calculation?
A: Accuracy depends on the precision of the torque coefficient value, which varies with lubrication, surface finish, and thread condition.

Q4: Can this formula be used for all fastener types?
A: While the basic formula applies to most threaded fasteners, specialized fasteners may require modified calculations.

Q5: What units should I use for this calculation?
A: Use consistent SI units: torque in Newton-meters (Nm), diameter in meters (m), which will give clamp load in Newtons (N).