Matters Needing Attention for Nadcap Audit of Rockwell Hardness

The requirements for Rockwell hardness test equipments, specimen preparation and hardness tester calibration during Nadcap audit of Rockwell hardness were introduced. The common non-conformances, their forming reasons and relevant preventive measures during Nadcap audit were summarized in order to provide reference for some enterprises seeking Nadcap accreditation, upgrade the domestic aerospace products quality and promote the development of international subcontracting production.