Can all A307A material be certified to Grade 2?

FAQ: Can all A307A material be certified to Grade 2?

Answer

No, not all A307A material can be certified to Grade 2.

Size and Configuration Limitations

Grade 2 requirements apply only to:

• Bolts and screws sized 1/4″ through 3/4″ in diameter that are 6″ or shorter in length.
• Studs of all lengths within that same diameter range.

For bolts and screws longer than 6″, Grade 1 requirements apply instead.

Proof Load Requirement

Grade 2 fasteners must successfully pass a proof-load test, confirming that they can withstand a specified load without permanent deformation.
This test ensures performance consistency and safety in applications where the fastener’s structural integrity is critical.
By comparison, A307A does not have a proof load requirement.

Minimum Yield Strength Requirement

Grade 2 also includes a minimum yield strength requirement, which defines the point at which the material begins to break under stress.
This property provides assurance that the fastener can carry its designed load with a margin of safety.
A307A (Grade A) bolts, however, have no minimum yield strength requirement — which is why they cannot automatically be certified as Grade 2 unless they are specifically tested and verified to meet those additional mechanical criteria.

Portland Bolt Expertise

When it comes to understanding fastener specifications, Portland Bolt stands out as a trusted industry expert. Our knowledgeable team works with ASTM and SAE standards every day, ensuring your products meet the exact specifications required for your project.

Whether you’re sourcing structural bolts, OEM components, or custom-manufactured fasteners, Portland Bolt’s sales representatives provide the technical guidance and quality assurance you need to make confident purchasing decisions.

With over a century of manufacturing experience, we make sure you get the right product, made right — every time.

Additional Resources

For more technical information, visit these helpful Portland Bolt reference pages:

•  SAE J429 Specification Overview – Covers mechanical and dimensional standards for Grades 1, 2, 5, and 8 fasteners.
•  Strength Requirements by Grade – Detailed mechanical properties and dimensional limitations for various bolt grades.
•  ASTM A307 Specification Overview – Summarizes the A307 Grade A and B requirements and allowable applications.