1. What is the Torque Equation?

The torque equation T = K × F × D calculates the tightening torque required for metric bolts, where T is the torque in Newton-meters (Nm), K is the torque coefficient (dimensionless), F is the force in Newtons (N), and D is the bolt diameter in meters (m).

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

• \( T \) — Tightening torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Force applied (N)
• \( D \) — Bolt diameter (m)

Explanation: The equation calculates the rotational force needed to properly tighten a metric bolt based on its size and the applied force.

3. Importance of Torque Calculation

Details: Proper torque calculation is essential for ensuring bolt integrity, preventing under-tightening (which can lead to loosening) and over-tightening (which can cause bolt failure or thread damage).

4. Using the Calculator

Tips: Enter the torque coefficient (typically 0.2 for dry, unlubricated bolts), the 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 value for the torque coefficient K?
A: For dry, unlubricated bolts, K is typically around 0.2. For lubricated bolts, K can be as low as 0.15-0.18.

Q2: How do I convert bolt diameter from mm to m?
A: Divide the millimeter value by 1000. For example, 10mm = 0.01m.

Q3: Why is proper torque important in bolted connections?
A: Proper torque ensures the bolt develops adequate clamping force to maintain joint integrity without exceeding the bolt's yield strength.

Q4: What factors affect the torque coefficient K?
A: Surface finish, lubrication, thread condition, and material combinations all affect the torque coefficient value.

Q5: Can this calculator be used for imperial bolt measurements?
A: This calculator is designed for metric measurements. For imperial bolts, appropriate unit conversions would be needed.