1. What is the Screw Torque Force Equation?

The screw torque force equation calculates the axial force generated by a screw when torque is applied. This is essential for determining the clamping force in bolted joints and mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the screw torque force equation:

Where:

• \( F \) — Axial force (N)
• \( T \) — Applied torque (Nm)
• \( K \) — Torque coefficient (dimensionless)
• \( D \) — Screw diameter (m)

Explanation: The equation relates the applied torque to the resulting axial force through the screw diameter and a friction-dependent coefficient.

3. Importance of Screw Torque Force Calculation

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

4. Using the Calculator

Tips: Enter torque in Nm, coefficient (typically 0.2 for dry steel), and diameter in meters. All values must be positive and valid.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical value for torque coefficient K?
A: For dry steel screws, K is typically around 0.2. Lubricated screws may have values around 0.15-0.18.

Q2: Why is diameter important in this calculation?
A: Larger diameters require more torque to achieve the same axial force due to the increased lever arm.

Q3: Can this formula be used for all types of screws?
A: While the basic principle applies to most screws, specific thread designs and materials may require adjusted coefficients.

Q4: How accurate is this calculation?
A: Accuracy depends on the precision of the torque coefficient value, which can vary with lubrication, surface finish, and thread condition.

Q5: What units should I use for this calculation?
A: Use consistent SI units: torque in Newton-meters (Nm), diameter in meters (m), and force in Newtons (N).