1. What is Screw Torque Calculation?

Screw torque calculation determines the rotational force required to properly tighten a fastener. Accurate torque calculation is essential for ensuring proper clamping force, preventing joint failure, and avoiding damage to components.

2. How Does the Calculator Work?

The calculator uses the torque equation:

Where:

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

Explanation: The equation calculates the torque required based on the friction coefficient, applied force, and bolt diameter.

3. Importance of Torque Calculation

Details: Proper torque calculation ensures fastener integrity, prevents under-tightening (which can lead to joint failure) and over-tightening (which can damage threads or break fasteners).

4. Using the Calculator

Tips: Enter the coefficient value (typically 0.15-0.25 for lubricated bolts, 0.20-0.30 for dry bolts), force in Newtons, and diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for coefficient K?
A: For most applications, K ranges from 0.15 to 0.30, with lubricated bolts at the lower end and dry or plated bolts at the higher end.

Q2: How does thread pitch affect torque calculation?
A: Thread pitch is accounted for in the coefficient K. Finer threads typically require slightly higher torque values for the same clamping force.

Q3: Should I use metric or imperial units?
A: The calculator works with any consistent unit system, but the formula expects Newtons for force and meters for diameter to yield Newton-meters for torque.

Q4: How accurate is this calculation?
A: This provides an estimate. Actual torque requirements can vary based on surface finish, lubrication, thread condition, and material properties.

Q5: When should I use a torque wrench?
A: Always use a calibrated torque wrench for critical applications to ensure proper fastener tension and joint integrity.