Flange Bolt Torque Calculator


In engineering and construction, precise calculations are vital, especially when it comes to tightening flange bolts securely. To ensure safety and integrity, a reliable tool like the Flange Bolt Torque Calculator becomes indispensable. This article presents a user-friendly calculator and guides you through its usage, formula, examples, FAQs, and concludes its significance.

How to Use

  1. Enter the required parameters in the designated fields.
  2. Click the “Calculate” button to obtain the torque value.
  3. Ensure all inputs are accurate for reliable results.


The torque required for tightening flange bolts can be calculated using the following formula:


  • T is the torque in foot-pounds (ft-lbs).
  • K is the coefficient of friction.
  • F is the bolt tension force in pounds-force (lbs).
  • D is the bolt diameter in inches.
  • R is the thread pitch diameter in inches.

Example Solve

Let’s say we have a bolt tension force F=5000 lbs, bolt diameter D=0.5 inches, thread pitch diameter R=0.3 inches, and a coefficient of friction K=0.2.

Using the formula:

So, the required torque would be approximately 138.89 ft-lbs.


Q: Why is accurate torque important for flange bolts?
A: Accurate torque ensures proper sealing and prevents leakage, enhancing the integrity and safety of the assembly.

Q: Can this calculator be used for different bolt materials?
A: Yes, but ensure the coefficient of friction (K) is adjusted accordingly for different materials.

Q: What if I don’t have the thread pitch diameter?
A: You can measure it using a thread pitch gauge or consult engineering specifications.

Q: Are there any safety precautions to consider when tightening bolts?
A: Always follow manufacturer guidelines and consider using a torque wrench for precise tightening.


The Flange Bolt Torque Calculator simplifies the crucial task of determining the required torque for tightening flange bolts accurately. By following the provided instructions and utilizing the formula, engineers and technicians can ensure the integrity and safety of their assemblies with confidence.

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