SAE ARP1820 Rev C

Current Revision
Chord Method of Evaluating Surface Microstructural Characteristics

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SAE ARP1820 Rev C

Chord Method of Evaluating Surface Microstructural Characteristics

PUBLISH DATE 2026
PAGES 7
SAE ARP1820 Rev C

This practice provides a method for evaluating microhardness and microstructure very close (0.002 inch (0.051 mm) or less) to the surface of a disk specimen.

Specific accept/reject criteria for:

  • partial decarburization (3.7.1),
  • inadvertent carburization/nitriding (3.7.3),
  • total decarburization/intergranular oxidation (3.8),
  • and other characteristics evaluated

are to be found in the applicable specification where this ARP is referenced.

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