Bolt Preload and Torque Calculator

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Bolt Preload Tension Force

Bolt Preload Calculator

Connection Type:

Tensile Stress Area (A_t):

Proof Strength (S_p):

Output Preload Unit:

Bolt Preload Torque

Bolt Torque Calculator

Bolt Condition (K):

Preload Force (F_i):

Diameter (d):

Output Torque Unit:

Bolt Pretension refers to the initial tensile force applied to a bolt when it is tightened. This force creates a clamping load between connected components, ensuring joint integrity by preventing loosening due to vibrations, external loads, or thermal changes.

Torque Related to Bolt Pretension is the rotational force applied to the bolt during tightening to achieve the desired pretension. The torque is influenced by factors such as the friction between the bolt threads and the nut, the friction under the bolt head, and the material properties. The relationship between torque and pretension can be estimated using the formula:

$T = K \cdot F_i \cdot d$

\text{Where:}
\begin{itemize}
\item $T$ : Torque
\item $K$ : Friction factor (depends on lubrication and surface finish)
\item $F_i$ : Pretension force
\item $d$ : Bolt diameter
\end{itemize}

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Author: Caesar Wiratama