1. What is the Bolt Tension vs Torque Formula?

The bolt tension vs torque formula calculates the axial force (tension) in a bolt based on the applied torque, torque coefficient, and bolt diameter. This relationship is fundamental in mechanical engineering for proper bolt tightening and joint integrity.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The formula establishes the relationship between the torque applied to a bolt and the resulting tensile force, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Bolt Tension Calculation

Details: Accurate bolt tension calculation is crucial for ensuring proper joint clamping force, preventing bolt failure, avoiding loosening under vibration, and maintaining structural integrity in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in Nm, 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 with lubrication, K is typically 0.15-0.25. The exact value depends on thread condition, lubrication, and materials.

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 results may vary due to friction variations, surface conditions, and lubrication.

Q4: Can this formula be used for all bolt types?
A: The formula applies to standard threaded fasteners. Special fasteners or unique thread forms may require modified calculations.

Q5: What factors affect the torque coefficient?
A: Surface finish, lubrication, thread pitch, material hardness, and washers all influence the torque coefficient value.