1. What is Screw Torque To Clamping Force Calculation?

The screw torque to clamping force calculation determines the axial clamping force generated when torque is applied to a screw or bolt. This is essential for proper joint design and ensuring adequate preload in bolted connections.

2. How Does the Calculator Work?

The calculator uses the clamping force formula:

Where:

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

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

3. Importance of Clamping Force Calculation

Details: Accurate clamping force calculation is crucial for proper joint design, preventing joint failure, ensuring adequate sealing, and maintaining structural integrity in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in Nm, torque coefficient (typically 0.2 for standard conditions), and nominal 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: The torque coefficient typically ranges from 0.15 to 0.25 for most applications, with 0.2 being a common default value for standard conditions.

Q2: Why is clamping force important in bolted joints?
A: Proper clamping force ensures joint integrity, prevents loosening, maintains sealing pressure, and provides the necessary preload to withstand operational loads.

Q3: How does lubrication affect the torque coefficient?
A: Lubrication reduces friction and therefore decreases the torque coefficient, resulting in higher clamping force for the same applied torque.

Q4: What factors can affect the accuracy of this calculation?
A: Surface finish, lubrication, thread condition, and material properties can all affect the actual torque coefficient and therefore the accuracy of the calculation.

Q5: Should this calculation be used for critical applications?
A: For critical applications, experimental verification and consideration of safety factors are recommended, as the actual torque coefficient can vary significantly from theoretical values.