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2. Rockwell hardness test - Wikipedia

   en.wikipedia.org/wiki/Rockwell_hardness_test

   Bearing metals and other very soft or thin materials: 130: 500 R: HRR: 60: 1 ⁄ 2 in (12.70 mm) ball: Thermoplastics, bearing metals, and other very soft or thin materials: 130: 500 S: HRS: 100: 1 ⁄ 2 in (12.70 mm) ball: Bearing metals and other very soft or thin materials: 130: 500 V: HRV: 150: 1 ⁄ 2 in (12.70 mm) ball: Bearing metals and ...

3. Indentation hardness - Wikipedia

   en.wikipedia.org/wiki/Indentation_hardness

   Brinell hardness test (HB) BHN and HBW are widely used [7] Knoop hardness test (HK), for measurement over small areas, widely used to test glass or ceramic material. [8] Janka hardness test, for wood; Meyer hardness test; Rockwell hardness test (HR), principally used in the USA. HRA, HRB and HRC scales are most widely used.

4. Vickers hardness test - Wikipedia

   en.wikipedia.org/wiki/Vickers_hardness_test

   The Vickers hardness test was developed in 1921 by Robert L. Smith and George E. Sandland at Vickers Ltd as an alternative to the Brinell method to measure the hardness of materials. [1] The Vickers test is often easier to use than other hardness tests since the required calculations are independent of the size of the indenter, and the indenter ...

5. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .

6. Janka hardness test - Wikipedia

   en.wikipedia.org/wiki/Janka_hardness_test

   For hardwood flooring, the test usually requires an 80 mm × 150 mm (3 in × 6 in) sample with a thickness of at least 6–8 mm, and the most commonly used test is the ASTM D1037. When testing wood in lumber form, the Janka test is always carried out on wood from the tree trunk (known as the heartwood), and the standard sample (according to ...

7. Knoop hardness test - Wikipedia

   en.wikipedia.org/wiki/Knoop_hardness_test

   The Knoop hardness test / k ə ˈ n uː p / is a microhardness test – a test for mechanical hardness used particularly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes.