1. What is the Screw Torque Calculation Formula?

The Screw Torque Calculation Formula estimates the torque required to achieve a specific axial force in a screw. It is widely used in mechanical engineering and construction for proper bolt tightening and joint integrity.

2. How Does the Calculator Work?

The calculator uses the screw torque formula:

Where:

• \( T \) — Torque (Nm or lb-in)
• \( F \) — Axial force (N or lb)
• \( K \) — Torque coefficient (dimensionless, typically 0.1-0.2)
• \( D \) — Bolt diameter (m or in)

Explanation: The formula calculates the torque needed to produce a specific clamping force in a bolted joint, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Torque Calculation

Details: Accurate torque calculation is essential for proper bolt tightening, preventing joint failure, ensuring structural integrity, and avoiding damage to threaded components.

4. Using the Calculator

Tips: Enter axial force in N or lb, torque coefficient (typically between 0.1-0.2), and bolt diameter in m or in. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: The torque coefficient typically ranges from 0.1 to 0.2, but can vary based on lubrication, thread condition, and material properties.

Q2: Why is proper torque important in bolted joints?
A: Proper torque ensures adequate clamping force, prevents loosening, maintains joint integrity, and avoids thread stripping or bolt failure.

Q3: How does lubrication affect torque calculations?
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 types of screws and bolts?
A: While the basic formula applies to most threaded fasteners, specific applications may require adjustments for unique thread designs or materials.

Q5: What units should I use for consistent results?
A: Use consistent units throughout - either metric (N, m, Nm) or imperial (lb, in, lb-in). Don't mix units in the same calculation.