Standard Rockwell Test Blocks (Superficial scales)
Features
- 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 | ||
Scale | Hardness Range | Material / Size |
HR15N | 70-77, 78-88, 89-94 | Steel / dia 50 & 64 mm |
HR30N | 42-54, 55-73, 74-86 | Steel / dia 50 & 64 mm |
HR45N | 20-31, 32-61, 63-77 | Steel / dia 50 & 64 mm |
HR15TW | 73-80, 81-87 | Aluminium / Dia 64 mm |
88-93 | Steel / dia 50 & 64 mm | |
HR30TW | 43-56, 57-69 | Aluminium / Dia 64 mm |
70-82 | Steel / dia 50 & 64 mm | |
HR45TW | 12-33, 34-54 | Aluminium / Dia 64 mm |
55-72 | Steel / dia 50 & 64 mm | |