JIS B 7420:1997 is a critical Japanese Industrial Standard titled "Plain Limit Gauges."
The master disk slid into the ring gauge with a satisfying, airtight hiss. It was perfect. Kaito returned to his bench, the steel now feeling less like a burden and more like a partner. He slid the ring gauge over the prototype shaft. It glided on smoothly—a perfect "GO." He tried the other side—the "NOT GO"—and it stopped dead, exactly where it should. jis b 7420 pdf
There are three primary reasons engineers search for this document: JIS B 7420:1997 is a critical Japanese Industrial
JIS B 7420:1997 Japanese Industrial Standard for Plain Limit Gauges He slid the ring gauge over the prototype shaft
Permissible Wear: A major part of the document defines "permissible wear within hole tolerance" and "permissible wear within shaft tolerance." This allows for a small amount of material to wear away from the gauge over time while still maintaining the integrity of the inspection.
JIS B 7420 is the Japanese Industrial Standard for Plain Limit Gauges, providing critical requirements for the design and manufacturing of gauges used to check hole and shaft tolerances in mechanical engineering. Overview of JIS B 7420