1. What is the Screw Torque Equation?

The screw torque equation calculates the torque required to achieve a specific clamping force in a threaded fastener. It is essential for proper bolt tightening in mechanical assemblies and engineering applications.

2. How Does the Calculator Work?

The calculator uses the screw torque equation:

Where:

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

Explanation: The equation calculates the rotational force needed to achieve a specific axial clamping force in a threaded fastener.

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for proper bolt tightening, preventing joint failure, ensuring structural integrity, and maintaining safety in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque coefficient (typically 0.15-0.25 for lubricated 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 lubricated steel bolts, K is typically 0.15-0.25. Dry or plated bolts may have higher coefficients up to 0.35.

Q2: Why is proper torque important?
A: Proper torque ensures adequate clamping force without overstressing the bolt, preventing joint failure and maintaining structural integrity.

Q3: How does lubrication affect torque?
A: Lubrication reduces friction, allowing more of the applied torque to convert to clamping force rather than overcoming friction.

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

Q5: Should torque values be verified?
A: Yes, critical applications should use torque wrenches and may require additional verification methods like torque-angle monitoring.