1. What is the Screw Torque Tension Formula?

The Screw Torque Tension Formula calculates the tension force generated in a bolt or screw when a specific torque is applied. It's essential for ensuring proper fastener preload and joint integrity in mechanical assemblies.

2. How Does the Calculator Work?

The calculator uses the screw torque tension formula:

Where:

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

Explanation: The formula relates applied torque to the resulting tensile force in a fastener, accounting for friction and geometric factors through the torque coefficient.

3. Importance of Screw Torque Tension Calculation

Details: Accurate tension calculation is crucial for proper bolt preloading, preventing joint failure, avoiding over-torquing, and ensuring structural integrity in mechanical assemblies.

4. Using the Calculator

Tips: Enter torque in Nm, torque coefficient (typically 0.15-0.25 for standard fasteners), and 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 unlubricated steel fasteners, K is typically 0.15-0.25. Lubricated fasteners may have lower values (0.10-0.15).

Q2: Why is accurate tension important?
A: Proper tension ensures the fastener can withstand operational loads without loosening or breaking, and maintains joint integrity.

Q3: How does lubrication affect the calculation?
A: Lubrication reduces friction, which decreases the torque coefficient, meaning less torque is needed to achieve the same tension.

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

Q5: Can this formula be used for all fastener types?
A: While the basic principle applies, specific fastener designs may require modified formulas or empirical data for accurate calculations.