ASTM B939 is the ASTM standard for measuring the radial crushing strength, K, of powder metallurgy (PM) bearings and structural materials. It is used to evaluate how these sintered components respond to radial loading, helping manufacturers and purchasers understand mechanical performance in a controlled test setting. By providing a consistent testing approach, the standard supports comparison, quality control, and more confident material selection for PM parts used in engineering applications.

What is ASTM B939?

ASTM B939 is a standard test method focused on radial crushing strength, K, for powder metallurgy bearings and structural materials. Its technical purpose is to define a repeatable way to assess how these components withstand crushing forces applied in the radial direction. For PM products, that kind of test information can be useful when evaluating part integrity, production consistency, and suitability for use in designs where load-bearing behavior matters.

Where is ASTM B939 used?

This standard is commonly used in powder metallurgy production and testing environments where bearings and structural parts are evaluated before release or qualification. It may be applied by manufacturers, laboratories, and quality teams working with sintered components that need mechanical verification. ASTM B939 is especially relevant in workflows that involve material characterization, incoming inspection, product development, and comparison of PM parts intended for engineering use.

Why is ASTM B939 important?

ASTM B939 matters because it gives users a defined method for checking radial crushing strength in PM bearings and structural materials. That helps improve consistency across testing, supports procurement decisions, and reduces uncertainty when comparing products from different sources. In practice, the standard can aid quality control and performance evaluation by making results more repeatable and easier to document for compliance or internal engineering review.

• Radial crushing strength testing
• PM bearings and structural materials
• Consistent mechanical evaluation
• Quality control and product comparison
• Engineering and procurement support