Jis B 7420 Pdf _best_ Jun 2026

, which are essential tools used for the dimensional inspection of holes and shafts. Below is a technical report summary based on the standard's specifications. NormSplash 1. Scope and Application

To help point you toward the exact technical tables you need, could you share the or part tolerance you are working with? I can also provide details on how JIS B 7420 compares to ISO equivalents if you are exporting to Europe or the Americas. Share public link

Specifies required steel types and heat treatment standards to minimize wear.

The standard, officially titled "Plain Limit Gauges," is a Japanese Industrial Standard (JIS) that specifies the requirements for dimensional inspection tools used for holes and shafts. It provides the technical basis for ensuring that parts manufactured for machinery and precision equipment fall within their specified tolerance zones. Scope and Application jis b 7420 pdf

They require a surface plate (typically granite) that meets the flatness tolerance for Grade 0 as defined in Table 2 of the standard. You will need a calibration certificate referencing that specific grade and standard.

Compare this to the standard to see if your current tools already comply.

| Feature | JIS B 7420 | ISO 8512 | DIN 876 | | :--- | :--- | :--- | :--- | | | Japan/Asia | Global | Germany/Europe | | Grades | 0, 1, 2 | 0, 1, 2, 3 | 00, 0, 1, 2 | | Flatness Formula | More stringent for smaller plates | Linear with size | Similar to ISO | | Material Preference | Granite & Cast Iron | Granite only | Cast Iron primarily | , which are essential tools used for the

Always ensure you are using the latest version of the standard (check for revisions after 1997, such as 2015 or newer). Summary of Scope and Application Description JIS B 7420 Title Plain Limit Gauges Application Inspection of holes, shafts, and snap gauges Size Range Primarily up to Common Uses Go/No-Go inspection, QC calibration

Key definitions include Plain Limit Gauges, GO gauges (checking Maximum Material Limit), NOT GO gauges (checking Least Material Limit), and Nominal Size. Importance of the JIS B 7420 PDF

The standard applies to torque wrenches used for tightening or loosening bolts, nuts, and other fasteners. It covers torque wrenches with a range of 10 N·cm to 10 000 N·m. Scope and Application To help point you toward

Standardized definitions for plain limit gauges, GO gauges, and NOT GO gauges.

According to the JIS B 7420:1997 official preview , the paper covers:

Yes, if you manufacture measuring equipment or use surface plates for legal metrology (trade, safety, or health). For general workshop use, it is a recommended best practice.

Must not pass over the shaft. It checks the minimum allowable size of the shaft. Key Technical Specifications in the JIS B 7420 PDF