A test bar with a known Brinell Hardness Number (BHN), which closely matches the hardness of the specimen being tested, is selected. To ensure the highest consistent accuracy, it is crucial that the BHN of the test bar falls within a range of plus or minus 15% of the BHN of the specimen and that both the test bar and the specimen share similar material characteristics. Kindly note that when testing non-ferrous materials using carbon steel bars, impact errors may occur, necessitating the application of correction factors to the test results to compensate for differences in material properties.

The standard dimensions of the BHN (Brinell Hardness Number) bars are 9/16 sq inches x 6 inches.

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