Screw Torque Calculation Formula

Screw Torque Formula:

\[ T = K \times F \times D \]

Torque (T):

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1. What is Screw Torque Calculation?

Screw torque calculation determines the rotational force required to properly tighten a screw or bolt. The formula T = K × F × D calculates the torque needed based on the torque coefficient, applied force, and screw diameter.

2. How Does the Calculator Work?

The calculator uses the screw torque formula:

\[ T = K \times F \times D \]

Where:

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

Explanation: The torque coefficient accounts for friction and other factors that affect the relationship between applied force and resulting torque.

3. Importance of Torque Calculation

Details: Proper torque calculation is essential for ensuring secure fastening without damaging threads or components. Under-torquing can lead to loosening, while over-torquing can cause thread stripping or bolt failure.

4. Using the Calculator

Tips: Enter the torque coefficient (typically 0.15-0.25 for standard bolts), the applied force in Newtons, and the screw diameter in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For standard steel bolts, K is typically between 0.15-0.25. Lubricated threads may have lower values, while dry or corroded threads may have higher values.

Q2: Why is proper torque important?
A: Proper torque ensures joint integrity, prevents loosening from vibration, and avoids damage to threads or components from over-tightening.

Q3: How does thread lubrication affect torque?
A: Lubrication reduces friction, allowing more of the applied torque to be converted to clamping force rather than overcoming friction.

Q4: What units should be used?
A: Force in Newtons (N), diameter in meters (m), and the resulting torque will be in Newton-meters (Nm).

Q5: Are there different formulas for different screw types?
A: While T = K×F×D is the fundamental formula, specific applications may use modified versions that account for thread pitch, material properties, or other factors.