1. What is the Torque Formula For Bolts?

The torque formula T = K × D × F calculates the required torque to achieve a specific preload force in bolted joints, where K is the nut factor, D is the bolt diameter, and F is the preload force.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (N·m)
• \( K \) — Nut factor (dimensionless)
• \( D \) — Bolt diameter (m)
• \( F \) — Preload force (N)

Explanation: The formula accounts for the relationship between applied torque and the resulting tension in a bolt, with the nut factor representing friction and other variables.

3. Importance of Torque Calculation

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

4. Using the Calculator

Tips: Enter nut factor (typically 0.15-0.3 for standard conditions), bolt diameter in meters, and preload force in newtons. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical nut factor value?
A: For standard conditions with lubricated threads, K is typically 0.15-0.3. Dry or poorly lubricated threads may have higher values.

Q2: Why is preload force important?
A: Proper preload ensures the joint remains tight under operating conditions and prevents loosening due to vibration or thermal cycling.

Q3: How accurate is this torque formula?
A: The formula provides a good estimate but actual torque requirements can vary due to lubrication, surface conditions, and thread quality.

Q4: Can this formula be used for all bolt types?
A: The formula is generally applicable but specific applications may require adjustments for special thread forms or materials.

Q5: Should torque be measured or calculated?
A: For critical applications, both calculation and direct measurement (using torque wrenches) are recommended to ensure accuracy.