1. What is the Bolt Torque Formula?

The bolt torque formula calculates the torque required to properly tighten a bolt or fastener. It is essential for ensuring proper clamping force and preventing joint failure in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the bolt torque formula:

Where:

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

Explanation: The formula calculates the torque required to achieve a specific clamping force based on the bolt size and friction characteristics.

3. Importance of Bolt Torque Calculation

Details: Proper bolt torque is critical for maintaining joint integrity, preventing loosening, avoiding bolt failure, and ensuring safety in mechanical assemblies.

4. Using the Calculator

Tips: Enter the torque coefficient (typically 0.15-0.25 for lubricated bolts), clamping force in newtons, and bolt diameter in meters. All values must be positive.

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, with 0.2 being a common average value for lubricated bolts.

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

Q3: How does lubrication affect torque values?
A: Lubrication reduces friction, allowing more clamping force to be achieved with less torque. Always use the K value appropriate for the lubrication condition.

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

Q5: Should torque values be verified?
A: Yes, critical applications should use torque wrenches for verification and periodically check torque values during service.