Clamp Load Calculator

Formula

The formula to calculate the Clamp Load (CL) is:

\[ \text{CL} = \frac{\text{T}}{\text{K} \cdot \text{D} \cdot \mu} \]

Where:

\( \text{CL} \) is the clamp load (kN)
\( \text{T} \) is the torque applied to the fastener (Nm)
\( \text{D} \) is the nominal diameter of the fastener (mm)
\( \mu \) is the friction coefficient between the mating surfaces
\( \text{K} \) is a constant (0.2 is commonly used for metric fasteners)

What is Clamp Load?

Clamp load, also known as preload, is the tension generated in a fastener when it is tightened. This load is critical in ensuring that the fastener does not loosen under operational conditions. It is the force that holds together the components being fastened, preventing separation or sliding. The clamp load must be properly calculated to ensure joint integrity without over-tightening, which can lead to fastener or material failure.

Example Calculation

Let's assume the following values:

Torque Applied (T) = 50 Nm
Nominal Diameter (D) = 10 mm
Friction Coefficient (μ) = 0.15
Constant (K) = 0.2

Using the formula to calculate the Clamp Load:

\[ \text{CL} = \frac{50}{0.2 \cdot 10 \cdot 0.15} = \frac{50}{0.3} = 166.67 \text{ kN} \]

The Clamp Load (CL) is 166.67 kN.