Avoid these pitfalls:
It accounts for the permissible wear of the gauge itself, ensuring that even as a gauge is used repeatedly, it stays within the "limit of maximum permissible gauge wear". jis b 7420 pdf
The standard JIS B 7420 typically covers: Avoid these pitfalls: It accounts for the permissible
—the smallest shaft or the largest hole. These should not fit or pass through the part. Wear Allowance the paper covers:
. These are typically shorter than GO gauges or have a reduced measuring area. Wear Allowances
According to the JIS B 7420:1997 official preview , the paper covers: