: NOT GO gauges are often identified by a red mark or a distinct groove. NormSplash Procurement and Formats The standard is widely available in PDF format through several international standards organizations: Japanese Standards Association (JSA)
JIS B 7420 is the Japanese Industrial Standard for , 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 jis b 7420 pdf
: Gauges are typically constructed from durable materials like alloy tool steel (e.g., SKS31) with high hardness (HRC 58–64) to resist wear during repeated inspections. : NOT GO gauges are often identified by
: Used to check the LML. For a hole, this represents the maximum permissible size; for a shaft, it is the minimum. : Used to check the LML
: Applicable for nominal sizes not exceeding 500 mm . Standardized Gauge Types