Jis B 7420 Pdf Repack | 2026 Edition |
Using JIS B 7420 ensures that manufacturers and clients are on the same page regarding acceptance or rejection criteria. How to Access the Full Standard
The primary document, , establishes the mechanical tolerances, maximum permissible wear limits, and functional geometry for checking cylindrical parts (holes and shafts). Obtaining a JIS B 7420 PDF copy is essential for precision machinists, metrologists, and quality control engineers operating under Japanese and global automotive or electronics supply chains. Scope and Technical Specifications
Using the precise dimensions provided in the standard's annex for designing new gauges.
Find who supply gauges compliant with this standard. Explain the specific tolerance tables for IT6 or IT7. jis b 7420 pdf
The official PDF can be obtained from several authorized standards retailers. Prices listed are subject to change, but here are the primary sources:
| Term (English) | Term (Japanese) | Definition | | :--- | :--- | :--- | | | 通り側 (Tōrigawa) | A gauge based on the Maximum Material Limit (MML) – the condition where a part has the maximum amount of material allowed. For a hole, this is its minimum permissible size; for a shaft, it's its maximum permissible size. | | NOT GO Gauge | 止り側 (Torigawa) | A gauge based on the Least Material Limit (LML) – the condition where a part has the least amount of material allowed. For a hole, this is its maximum permissible size; for a shaft, it's its minimum permissible size. |
: Gauges are selected based on the specific tolerance grade of the hole or shaft being inspected (e.g., H7, g6). Using JIS B 7420 ensures that manufacturers and
Used to measure the diameter of an internal hole.
Incorporating gauge tolerancing into your product design phase.
The length of the GO gauge portion of full-form cylindrical plug gauges, segmental cylindrical bar gauges, and ring gauges shall be equal to the length of the hole or shaft being inspected. The official PDF can be obtained from several
: Used for checking the dimensional accuracy of cylindrical parts (holes and shafts). Size Range : Applies to dimensions not exceeding Tolerance Grades : Covers grades IT6 to IT16 as specified in JIS B 0401.
The standard specifies various physical forms for these inspection tools: Plug Gauges : Used for internal diameters (holes). Ring and Snap Gauges : Used for external diameters (shafts). Reference Disks : Used specifically for calibrating or checking gap gauges. Intertek Inform Manufacturing Significance