1. What is the Screw Torque To Axial Force Formula?

The Screw Torque To Axial Force formula calculates the axial force generated from applied torque in screw fasteners. It's essential for determining the clamping force in bolted joints and mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( F \) — Axial force (lb)
• \( T \) — Applied torque (lb-in)
• \( K \) — Torque coefficient (decimal)
• \( D \) — Screw diameter (in)

Explanation: The formula converts rotational torque into linear axial force, accounting for the mechanical advantage of the screw diameter and friction through the torque coefficient.

3. Importance of Axial Force Calculation

Details: Accurate axial 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 lb-in, torque coefficient as a decimal value, and diameter in inches. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: Torque coefficient typically ranges from 0.15 to 0.25 for standard bolts, but varies based on lubrication, thread condition, and material.

Q2: Why is diameter important in this calculation?
A: Diameter determines the mechanical leverage - larger diameters require more torque to achieve the same axial force.

Q3: Can this formula be used for metric units?
A: Yes, but ensure consistent units (e.g., N·m for torque, mm for diameter, and N for force with appropriate conversion).

Q4: What factors affect the torque coefficient?
A: Surface finish, lubrication, thread pitch, material properties, and washers can all influence the torque coefficient value.

Q5: How accurate is this calculation?
A: Accuracy depends on the precision of the torque coefficient. For critical applications, experimental determination of K is recommended.