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Description

HFRR standard specimens are sold as a pack of 100 upper and 100 lower specimens. The upper specimen is a 6 mm diameter ball that is loaded into the upper specimen holder and the lower specimen is a 10 mm disc that is loaded into the lower specimen holder. The upper specimen (Ball) is specified (Material: AISI E-52100 steel) with a Rockwell hardness “C” scale (HRC) number of 58-66, and a surface finish of less than 0.05 µm Ra. The lower specimen (Disc) is specified (Material: AISI E-52100 steel) with Vickers hardness “30Hv” scale number of 190-210 and a surface finish of less than 0.02 µm Ra. All test Upper & Lower Specimens meet the requirements of: ASTM D6079-18, ISO 12156-1:2016, EN 590, JPI-5S-50, IP 450.