Verified by Rachel Mayfield, Supply Chain Analyst - April 2026
Photo by Pixabay on Pexels
Shear Strength is the maximum stress a material can withstand in a direction parallel to its surface before failure, critical for bolt and pin calculations.
When you're designing or maintaining mechanical assemblies, shear strength is key. For example, when selecting bolts for an application, you need to know how much lateral force they can handle without breaking. The same goes for pins used in
hinges or pivot points. Shear stress comes into play whenever there's a sliding motion along a surface.
Standards like ISO 6847 and BS EN ISO 6847 cover the testing methods for determining shear strength, while ISO 3269 and BS EN ISO 3269 detail material specifications. These standards provide guidelines on how to test materials under controlled conditions to ensure accurate results that engineers can rely on.
For common materials like A2-70
stainless steel or SAE grade 8 carbon steel, shear strength values are well documented. A2-70 stainless has a typical shear yield strength around 590 MPa and ultimate tensile strength of about 630 MPa. For SAE grade 8, the shear strength is roughly 1240 MPa.
Selecting components based on shear strength involves understanding both the material's properties and the stresses it will face in service. Engineers often use safety factors to account for uncertainties like manufacturing tolerances or environmental conditions. A common practice is to apply a safety factor of 3-5 times, ensuring that even under worst-case scenarios, the component won't fail due to shear stress.
When choosing bolts or pins, consulting material data sheets and adhering to industry standards is important. Trade bodies such as
CBM (Cranes and Hoists Manufacturers Association),
BIAFD (British Industrial
Fasteners Association) Ltd.,
BTMA (Bolt, Nut & Screw Association), and
BPMA (British Portable Machine Tools Association) provide valuable resources and guidelines for selecting the right components based on shear strength requirements.
Frequently Asked Questions
What is Shear Strength?
The maximum stress a material can withstand in a direction parallel to its surface before failure, critical for bolt and pin calculations.
What does Shear Strength refer to in mechanical engineering?
Shear strength refers to the maximum stress a material can endure parallel to its surface before failing, which is important for assessing bolts and pins under lateral forces.
According to ISO standards, what are some testing methods used to determine Shear Strength?
Standards like ISO 6847 and BS EN ISO 6847 provide guidelines on how to test materials under controlled conditions to accurately measure their shear strength.
For an engineer choosing between A2-70 stainless steel and SAE grade 8 carbon steel, what are the typical Shear Strength values they should consider?
A2-70 stainless steel typically has a shear yield strength around 590 MPa, whereas SAE grade 8 carbon steel has a shear strength of approximately 1240 MPa.
What factors should engineers consider when selecting components based on Shear Strength for mechanical assemblies in the UK?
Engineers must understand both material properties and expected service stresses to choose appropriate components. Standards such as ISO 3269 and BS EN ISO 3269 offer detailed specifications that are vital for selection.
Where can UK engineers find suppliers who provide materials with documented Shear Strength values like A2-70 stainless steel or SAE grade 8 carbon steel?
UK engineers can look at local engineering hardware suppliers listed on MLC's product pages, which often include full material specifications and shear strength data for components.
What is Shear Strength and why is it important for engineers in the UK?
Shear strength is the maximum stress a material can withstand parallel to its surface before failure, important for determining the suitability of bolts, pins, and other mechanical components. Engineers rely on standards like ISO 6847 and BS EN ISO 6847 to ensure accurate testing methods.
How do UK engineers choose materials based on shear strength for their projects?
When selecting materials, engineers consider both the material's documented shear strength values-such as 590 MPa for A2-70 stainless steel-and the expected operational stresses. This ensures components like bolts and pins can handle lateral forces without breaking.
What are some common standards used to determine the Shear Strength of engineering materials in the UK?
Standards such as ISO 6847 and BS EN ISO 6847 provide testing methods, while ISO 3269 and BS EN ISO 3269 offer material specifications. These guidelines help ensure consistent and reliable results for shear strength measurements.
Where can UK engineers find high-quality components with known Shear Strength values?
Engineers in the UK can source high-quality engineering hardware from reputable suppliers listed on mlc.org.uk, ensuring materials like SAE grade 8 carbon steel with a shear strength of approximately 1240 MPa are available for their projects.