1. What is Bolt Torque Calculation?

Bolt torque calculation determines the rotational force required to properly tighten a bolt or fastener. The formula T = K × F × D calculates the torque needed based on the torque coefficient, axial force, and bolt diameter.

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 bolt tension.

3. Importance of Torque Calculation

Details: Proper torque calculation is essential for ensuring bolt integrity, preventing joint failure, maintaining safety standards, and achieving optimal clamping force in mechanical assemblies.

4. Using the Calculator

Tips: Enter the torque coefficient (typically between 0.1-0.3 for most applications), the desired axial force in Newtons, and the 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 bolts with lubrication, K is typically between 0.15-0.20. Without lubrication, it may range from 0.20-0.30.

Q2: Why is proper torque important?
A: Under-torquing can lead to joint loosening, while over-torquing can cause bolt stretching, thread damage, or even bolt failure.

Q3: How does lubrication affect torque calculation?
A: Lubrication reduces friction, which lowers the torque coefficient. This means less torque is needed to achieve the same clamping force.

Q4: Can this formula be used for all bolt types?
A: While the basic formula applies to most bolts, specialized fasteners may require specific torque calculations or manufacturer recommendations.

Q5: How accurate is this calculation?
A: The calculation provides a good estimate, but actual results may vary due to factors like surface finish, thread condition, and lubrication consistency.