1. What is the Torque to Tension Formula?

The torque to tension formula calculates the axial tension force in a bolt based on the applied torque, torque coefficient, and bolt diameter. This relationship is essential for proper bolt tightening and joint integrity in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the torque to tension formula:

Where:

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

Explanation: The formula converts the rotational force (torque) applied to a bolt into the resulting axial tension force, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Tension Calculation

Details: Accurate tension calculation is crucial for ensuring proper bolt preload, preventing joint failure, avoiding over-tightening, 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 a typical torque coefficient value?
A: For standard steel bolts, K typically ranges from 0.15 to 0.25, but varies with lubrication, surface finish, and thread condition.

Q2: Why is bolt tension important?
A: Proper bolt tension ensures joint integrity, prevents loosening, and distributes loads evenly across connected components.

Q3: How accurate is this calculation?
A: Accuracy depends on the precision of the torque coefficient value. Actual tension can vary ±25% due to friction variations.

Q4: When should direct tension measurement be used instead?
A: For critical applications, direct measurement methods (ultrasonic, strain gauges) provide more accurate tension values.

Q5: Does this work for all bolt types?
A: The formula applies to standard bolts, but specialized fasteners may require different coefficients or calculation methods.