Check the cover page for the year of issuance. As of 2025, the latest version is JIS B 7420:2017 (confirm with JSA for any new updates). Do not use versions from 1991 or earlier for current compliance.
Many countries have reseller agreements with JSA. These are often more user-friendly for non-Japanese speakers. jis b 7420 pdf
Pro Tip: When purchasing, look for the "English Version." While the numerical tables are universal, the explanatory text and definitions are critical. Do not buy the Japanese-only version unless you are fluent in technical Japanese. Check the cover page for the year of issuance
Before diving into where to find the PDF, it is essential to understand why this standard matters. Pro Tip: When purchasing, look for the "English Version
Surface plates form the foundation of precision measurement. Whether you are using a dial gauge, a coordinate measuring machine (CMM), or a height gage, the flatness and rigidity of the surface plate directly affect measurement accuracy. JIS B 7420 defines:
If your facility exports to Japan or uses Japanese-designed equipment, adhering to JIS B 7420 is not optional—it is a contractual and legal necessity.
The JISC provides a free, read-only version of JIS standards for personal reference. However:
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