1. What is a Metric Screw Torque Calculator?

Definition: This calculator estimates the torque required for tightening metric screws based on friction factor, axial force, and screw diameter.

Purpose: It helps engineers and technicians determine the proper tightening torque for screw fasteners in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (Newton-meters)
• \( k \) — Friction factor (dimensionless)
• \( F \) — Axial force (Newtons)
• \( d \) — Screw diameter (meters)

Explanation: The torque is calculated by multiplying the friction factor by the axial force and the screw diameter.

3. Importance of Torque Calculation

Details: Proper torque calculation ensures secure fastening without damaging the screw or the materials being joined.

4. Using the Calculator

Tips: Enter the friction factor (default 0.2), axial force in Newtons, and screw diameter in meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical friction factor value?
A: For dry steel screws, k is typically 0.2. For lubricated screws, it may be 0.15-0.18.

Q2: How do I determine the axial force?
A: Axial force depends on the application requirements - consult engineering specifications or material requirements.

Q3: Why is screw diameter important?
A: Torque requirements increase with screw diameter as the lever arm increases.

Q4: Can this be used for imperial screws?
A: Yes, but ensure all units are converted to metric (Newtons and meters) first.

Q5: Does this account for thread pitch?
A: No, this is a simplified calculation. For precise calculations, thread pitch should be considered.