1. What is Bolt Tightening Torque?

Bolt tightening torque is the rotational force applied to a fastener to achieve proper clamping force. It is a critical parameter in mechanical assemblies to ensure joint integrity, prevent loosening, and maintain structural stability.

2. How Does the Calculator Work?

The calculator uses the bolt torque formula:

Where:

• \( T \) — Torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Force (N)
• \( D \) — Diameter (m)

Explanation: The torque coefficient accounts for friction and other factors that affect the relationship between applied torque and achieved clamping force.

3. Importance of Proper Torque Calculation

Details: Accurate torque calculation is essential for preventing joint failure, avoiding bolt breakage, ensuring proper sealing, and maintaining safety in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.15-0.25 for standard bolts), force in Newtons, and 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 based on lubrication, surface finish, and thread condition.

Q2: Why is proper torque important?
A: Proper torque ensures adequate clamping force, prevents joint loosening, avoids bolt failure, and maintains structural integrity.

Q3: How does lubrication affect torque?
A: Lubrication reduces friction, requiring less torque to achieve the same clamping force. Always use the K value appropriate for the lubrication condition.

Q4: What are common torque units?
A: Newton-meters (Nm) are standard, but pound-feet (lb-ft) and kilogram-force centimeters (kgf-cm) are also used in some applications.

Q5: Should torque be checked after assembly?
A: Yes, torque should be verified and rechecked after a settling period, especially in critical applications where joint integrity is essential.