Metric Nut Proof Load

Overview

Engineering reference data for Metric Nut Proof Load in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

Symbol	Description	Unit
$\sigma$	Stress	Pa
$\varepsilon$	Strain	—
$E$	Young's modulus	Pa
$\alpha$	Thermal expansion coefficient	1/°C
$\Delta T$	Temperature change	°C

Understanding Proof Load

Proof load is the maximum tensile force that a nut can withstand without permanent deformation. It is a critical safety parameter in mechanical design, ensuring that nuts maintain their integrity and clamping force under operational stresses without yielding. For metric nuts, proof loads are specified according to international standards and vary based on thread size, pitch, and property class.

Data Tables

Metric Nuts - Coarse Threads Proof Load

Metric Nuts - Fine Threads Proof Load

Interactive Charts

References

• Original Source