NAS0331 is a quality management system (QMS) standard specifically designed for the aerospace industry. It provides requirements for organizations to establish, implement, maintain, and continually improve a QMS that meets the needs of the aerospace industry.
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Requirements for balls and outer rings made from specific alloys (e.g., 440C or PH13-8Mo ). NAS0331 is a quality management system (QMS) standard
This involves using a specialized tool to displace material from the bearing’s outer ring or a separate retention lip into a groove in the housing. nas0331 pdf