Standard Rockwell Test Blocks (Regular scales)


  • Calibrated as per ISO 6508-3, IS 1586 (Part 3) and/or ASTM E18 (Annex A4)
  • Calibrated at Fmi Calibration Laboratory, NABL accredited (ISO/IEC 17025:2017)
  • Specially curated high-quality steel, aluminium and brass material
  • Specially designed heat treatment and cryogenic treatment to achieve maximum long term hardness stability, consistency and repeatability
  • Mirror surface finish by grinding, lapping and diamond polishing
  • Calibration traceability: Rockwell test blocks are calibrated using a standardising hardness testing machine which is directly and indirectly calibrated as per the requirements of ISO 6508-3 and ASTM E18 annex A2; using instruments traceable to SI system of units realised at NPL-India, NPL-UK, IMGC, NIST or PTB either directly or through NABL/UKAS/NVLAP/A2LA/DAkkS accredited laboratories
  • LASER marking on the surface of hardness value, Serial number, lab logo and ASTM tolerance (if applicable)
  • Optional hexagonal LASER grid marking
  • Available in shapes: Φ50 mm and Φ64 mm
  • Recommended key usage: Perform Indirect verification/calibration of hardness testers as per ISO 6508-2, IS 1586 (Part 2) or ASTM E18 annex A1, periodic quality control checks/intermediate checks, daily verifications, etc.

Available hardness scales and ranges as below

Standard Rockwell Test Blocks


Hardness Range 

Material / Size




Aluminium / Dia 64 mm

40-60, 60-70, 70-80, 80-90

Steel/ dia 50 or 64 mm


10-50, 50-60

Aluminium / Dia 64 mm

60-80, 85-100

Steel/ dia 50 or 64 mm


20-30, 30-40, 40-50, 50-60, 60-70

Steel / dia 50 & 64 mm 


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