Hardness Testing

Equipment Spotlight: Rockwell Hardness Tester

Hardness is a material’s resistance to indentation. The Rockwell hardness test method measures the permanent depth of an indentation created by a load applied to a material. Different indenters, such as diamond and ball indenters, can be used during this process depending on the test material. The process of hardness testing using the Rockwell method begins with the application of a minor load to the material to allow for a baseline depth of indentation to be measured. Then, a major load is applied to reach the total test load and is held for a specified time. The major load is released, returning the test back to the minor load. Hardness can be calculated during the distance measured between the minor load and major load indentions, or the permanent depth of indentation.

Hardness is not a fundamental physical property but rather a characteristic of a material—the material’s resistance to indentation, deformation, penetration or scratching—determined by one of many different hardness testing methods. The Rockwell method of hardness testing is the most common hardness test due to its reliability, consistency and speed of testing. Hardness testing is minimally non-destructive, and the information gained from hardness testing complements other material tests, such as tensile testing, to provide a complete profile of the material properties of a part or product. Determining a material’s hardness is useful in the selection of materials, for determining differences between materials, and for quality control of existing parts or products. The hardness of a product is vital to know when determining if a part of product has the properties needed for its proposed use.


  • Metals
  • Plastics


  • Minor Load: 10Kgf
  • Major Load: 60Kgf, 100Kgf, 150Kgf
  • Vertical Capacity: 6.7 in
  • Throat Depth: 6.6 in


  • Conforms to ASTM E-18, the most commonly used harness test method

For additional information on how we can help with all your additive manufacturing needs, please feel free to contact our team for testing, our sister company SabeRex for production, or TekRex for design and development.

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About ARL

Recognized as one of the top product reliability labs in the country with a unique balance of testing, consulting and on-site staffing services, Austin Reliability Labs (ARL) is a place where we recognize the hard work and passion that goes into the design and development of your product and want to find any problems in an effort to perfect it. We also understand a reputation is something that builds over time, so we focus on establishing long-term partnerships with each of our clients. With that in mind, we not only specialize in writing and developing all of the tests that we perform, but, unlike other labs, we provide pass / fail reports on all of our tests and decipher the results for you in order to maximize your product’s success. In addition to our on-site staffing and consulting services, ARL’s full array of reliability testing services include: HALT / HASS, Battery Life Tests, Qualification Tests, Environmental Tests, Mechanical Tests, Additive Manufacturing Tests and Custom Tests.

We believe quality is infused by finding every flaw in a product and methodically removing each one until the product shines. As a result, only a thorough, comprehensive reliability test program, as provided by ARL, will allow a product to emerge that will earn or maintain an unsullied and clean brand reputation.