Engineers and procurement teams frequently search for the official download to access exact mathematical tables. The document provides:
For a deep dive into specific dimensions and tables, you can view the sample excerpt of JIS B 7420:1997 here or purchase the full 52-page standard through providers like Afnor EDITIONS . JIS-B-7420-1997-en.pdf - NormSplash
Because ring gauges can wear down or change size, JIS B 7420 defines reference plug gauges used to check and set the limits of thread ring gauges. Key Technical Specifications
: Beyond calibration, the standard may outline how to verify that a torque wrench is functioning correctly within specified tolerances. This is crucial for quality control and ensuring that tools are performing as expected. jis b 7420 pdf
: Gauges like snap gauges are typically calibrated by comparison to ring gauge standards with a typical measurement uncertainty (e.g., for sizes up to Wear Limits : The standard provides formulas and tables for maximum permissible gauge wear to ensure continued accuracy in production environments. NormSplash 5. Availability Official Source
Manufacturers utilize JIS B 7420 to ensure interchangeability of parts. It is frequently referenced in the production of: : Such as engine pistons.
If you can tell me the you are measuring or if you need help with go/no-go gauge design tolerances , I can offer more tailored advice. Share public link Engineers and procurement teams frequently search for the
: Offers the standard with options for multi-user licenses and hard copies.
The standard is technically aligned with but includes specific Japanese measuring methods and additional criteria for acceptance/rejection in trade.
: Typically made from tool steel such as SKS31 with a hardness of 58–64 HRC to ensure wear resistance during repetitive use. Gauging Principle : NormSplash 5
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.
), let me know and I can try to find the specific tolerances listed in the standard.
This article provides an in-depth overview of the standard, its application, key technical definitions, and how to acquire the necessary documentation. What is JIS B 7420?