1. What is Bolt Clamp Force?

Bolt clamp force is the compressive force generated when a bolt is tightened, which holds joined materials together. It's a critical parameter in bolted joint design and analysis.

2. How Does the Calculator Work?

The calculator uses the clamp force formula:

Where:

• \( Torque \) — Applied torque (Nm)
• \( K \) — Torque coefficient (dimensionless, typically 0.2 for dry steel)
• \( d \) — Bolt diameter (m)

Explanation: The formula relates applied torque to the resulting clamp force through the torque coefficient and bolt diameter.

3. Importance of Clamp Force Calculation

Details: Proper clamp force ensures joint integrity, prevents loosening, and maintains sealing pressure. Too little force can lead to joint failure, while too much can damage components.

4. Using the Calculator

Tips: Enter torque in Nm, K value (typically 0.15-0.3), and bolt diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical K value?
A: For dry steel, K is typically 0.2. Lubricated threads may have K=0.15, while plated or rough surfaces may be higher.

Q2: How accurate is this calculation?
A: This provides an estimate. Actual clamp force depends on thread condition, lubrication, and surface finish.

Q3: What units should I use?
A: Use consistent SI units: torque in Nm, diameter in meters, resulting in force in Newtons.

Q4: Does this work for all bolt types?
A: The formula applies generally, but K values vary by bolt material, coating, and thread type.

Q5: How does friction affect clamp force?
A: Higher friction increases K value, reducing clamp force for a given torque. Proper lubrication is critical for consistent results.