TOLERANCING FORM DEVIATIONS FOR NIST STANDARD REFERENCE MATERIAL (SRM) 2809 ROCKWELL DIAMOND INDENTERS

John Song, Sam Low and Li Ma

Abstract

The National Institute of Standards and Technology (NIST) is developing Standard Reference Material (SRM) 2809 Rockwell Diamond Indenter to support Rockwell hardness standardization. Most tolerances of the SRM indenters are adopted from those of the calibration grade Rockwell indenters specified in ASTM and ISO standards except the form deviations from tip radius. Based on the historical data of geometrical measurements and hardness tests at NIST, and the results of FEA (Finite Element Analyses) simulations, a tight tolerance, ± 0.5 µm, is specified for the form deviations of the SRM indenters.

Keywords

Rockwell hardness, diamond indenter, form deviation

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IMEKO-TC5-2007-016.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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