Jis B 7420 Pdf May 2026

JIS B 7420: Essential Guide to Plain Limit Gauges

In the world of precision engineering and manufacturing, maintaining tight tolerances is non-negotiable. The JIS B 7420 standard—developed by the Japanese Industrial Standards (JSA)—serves as a critical benchmark for plain limit gauges . This post explores what this standard entails and why it’s a cornerstone of quality control for holes and shafts. What is JIS B 7420?

• Title and scope: defines the parts, components, or processes covered and the intended applications.
• Normative references: other standards and documents referenced for definitions or procedures.
• Definitions and symbols: precise definitions of terms, symbols, and notation used throughout.
• Dimensional system and tolerance principles: general rules for specifying dimensions and tolerances (e.g., tolerance grades, deviation tables).
• Tables and charts: standard tolerance values, fits, limits, and allowances for various shaft/hole combinations or features.
• Application examples: worked examples showing how to select fits, calculate clearances/interference, and apply tolerances in design.
• Notes on inspection and measurement: recommended measurement methods, sampling, and evaluation criteria.
• Annexes: normative or informative appendices with additional tables, conversion guidance, or examples.

jis b 7420 pdf

While you will need the actual for exact figures, here are the core parameters the standard regulates: jis b 7420 pdf

. It specifies requirements for limit gauges and reference disks used for the dimensional inspection of holes and shafts with diameters up to 500 mm. NormSplash Key Specifications of JIS B 7420 JIS B 7420: Essential Guide to Plain Limit