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Flange Bolt Torque Calculator

Formula

To calculate the flange bolt torque:

$T = \frac{k \times f \times d}{12}$

Where:

$T$ is the Flange Bolt Torque (ft-lb)
$k$ is the Tightening Factor
$f$ is the Axial Force (lbs)
$d$ is the Diameter of the Bolt (inches)

What is a Flange Bolt Torque?

The flange bolt torque is the total torque that a flange bolt is subjected to when being tightened by a wrench. The total torque required to tighten the bolt is dependent on the axial force seen by the bolt, the diameter, and the tightening factor. A tightening factor is a ratio or factor of safety that the bolt needs to be tightened to in order to sustain the axial load forces on the bolt.

Example Calculation 1

Let's assume the following values:

Tightening Factor ( $k$ ) = 0.2
Axial Force ( $f$ ) = 1000 lbs
Bolt Diameter ( $d$ ) = 1 inch

Using the formula:

$T = \frac{0.2 \times 1000 \times 1}{12} = \frac{200}{12} \approx 16.67 \, \text{ft-lb}$

The Flange Bolt Torque is approximately 16.67 ft-lb.

Example Calculation 2

Let's assume the following values:

Tightening Factor ( $k$ ) = 0.15
Axial Force ( $f$ ) = 1500 lbs
Bolt Diameter ( $d$ ) = 0.75 inch

Using the formula:

$T = \frac{0.15 \times 1500 \times 0.75}{12} = \frac{168.75}{12} \approx 14.06 \, \text{ft-lb}$

The Flange Bolt Torque is approximately 14.06 ft-lb.