Clamp Force From Bolt Torque Calculator

Clamp Force Formula:

\[ \text{Clamp} = \frac{T}{K \times D} \]

Clamp Force (Clamp):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Clamp Force Calculation?

The clamp force calculation determines the axial force generated by a bolt when a specific torque is applied. This is essential for ensuring proper joint integrity and preventing loosening in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the clamp force formula:

\[ \text{Clamp} = \frac{T}{K \times D} \]

Where:

\( Clamp \) — Clamp force (N)
\( T \) — Applied torque (N·m)
\( K \) — Torque coefficient (dimensionless)
\( D \) — Bolt diameter (m)

Explanation: The formula calculates the axial clamping force based on the applied torque, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Clamp Force Calculation

Details: Accurate clamp force calculation is crucial for proper bolt tensioning, preventing joint failure, ensuring leak-proof connections, and maintaining structural integrity in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in N·m, torque coefficient (typically 0.15-0.25 for standard bolts), and bolt diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for torque coefficient K?
A: For standard bolts, K typically ranges from 0.15 to 0.25, but can vary based on lubrication, surface finish, and thread condition.

Q2: Why is clamp force important in bolted joints?
A: Proper clamp force ensures joint integrity, prevents loosening from vibration, and maintains sealing pressure in gasketed joints.

Q3: How does lubrication affect the torque coefficient?
A: Lubrication reduces friction, which decreases the torque coefficient, meaning less torque is needed to achieve the same clamp force.

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

Q5: When should direct tension measurement be used instead of torque?
A: For critical applications where precise clamp force is essential, direct tension measurement methods (ultrasonic, strain gauges) are recommended.