1. What is Bolt Torque Calculation?

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

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (N·m)
• \( K \) — Torque coefficient (dimensionless)
• \( F \) — Axial force (N)
• \( D \) — Bolt diameter (m)

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

3. Importance of Proper Bolt Torque

Details: Correct bolt torque is critical for joint integrity, safety, and preventing failures from under-tightening or damage from over-tightening.

4. Using the Calculator

Tips: Enter the torque coefficient (typically 0.15-0.25 for standard bolts), the required axial force in newtons, and the bolt diameter in meters.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical torque coefficient value?
A: For standard bolts with lubrication, K is typically between 0.15-0.25. Dry or poorly lubricated bolts may have higher values.

Q2: How do I determine the required axial force?
A: The required force depends on the joint design, materials, and safety factors. Consult engineering specifications for your application.

Q3: Should I use metric or imperial units?
A: This calculator uses metric units (N·m, N, m). For imperial units (lb-ft, lb, in), conversion factors would be needed.

Q4: What affects the torque coefficient?
A: Surface finish, lubrication, thread pitch, and material combinations all influence the torque coefficient value.

Q5: Is this formula accurate for all bolt types?
A: While the basic formula applies to most bolts, specialized fasteners may require modified calculations or experimental determination.