: The standard defines the maximum permissible gauge wear, which is the point at which a gauge is no longer accurate enough to be used for inspection. NormSplash Accessing the PDF
The standard also addresses how the plate must be supported (e.g., three-point leveling systems) to prevent deflection under load. jis b 7420 pdf
No, but they are related. ISO 1938 covers inspection of plain workpieces. JIS B 7420 is more specific to the gauge itself . In many cases, JIS B 7420 is harmonized with ISO standards, but there are distinct differences in wear limits and tolerance classes. Never assume they are interchangeable. : The standard defines the maximum permissible gauge