Hardness testers are used in a variety of settings to measure the hardness or durability of materials ranging from plastics to hard metals. With such a wide range of materials, hardness testers vary based on the application requirements and utilize one of a few scales for reference. Two main types of hardness testers that we calibrate at J.A. King are Rockwell and Brinell hardness testers.
Rockwell hardness testers are typically used to test a wide variety of materials ranging from hard plastics and softer materials to metals such as copper, aluminum, or steel. They utilize a steel ball or diamond tipped spherical cone indentor, which, in general, is applied to material with a certain force to determine hardness. The hardness level is determined by applying a minor load with an initial penetration, setting a zero on a scale, and then applying a major load. The depth of penetration is correlated directly to a visual scale or gauge.
While Rockwell hardness testers utilize a direct reading with an indentor and associated gauge, Brinell hardness testers use a known force to penetrate a surface with a hardened steel or carbide sphere. With a specific sphere diameter, the indention left in the material is then measured, usually with an eyepiece such as a reticle or stage micrometer, to determine the level of hardness.
J.A. King offers ISO 17025 accredited hardness tester calibration for both Rockwell and Brinell hardness testers. Our ISO 17025 accreditation covers indirect verification of Rockwell hardness with methods outlined in ASTM-E18 (current version) and Brinell hardness in accordance with ASTM-E10 (current version). Our technicians utilize NIST traceable master standards to document as found readings on a certificate of calibration which is then stored for easy 24/7 access within GageSuite, our cloud based calibration management system.
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