If you need the PDF for professional use:
The "1" in JIS B 1702-1 is crucial. Part 1 deals with the definition of tolerances. Part 2 (JIS B 1702-2) deals with the measurement and inspection of those errors. You need both for a complete quality control system, but Part 1 is the foundation.
If you are currently using a scanned PDF from 1998, beware of these changes in the current revision (JIS B 1702-1:2015):
The JIS B 1702-1 PDF is copyrighted material. Free distribution via public websites is illegal. However, there are legitimate ways to obtain it:
| Source | Method | Cost | Notes | |--------|--------|------|-------| | JSA Web Store (Japanese Standards Association) | Direct purchase and download | ~¥4,200 + tax | Official PDF with digital watermarking. | | KIKAKU (JISC’s official portal) | Free web viewing, but no PDF download | Free | Allows read-only access; printing disabled. | | ISO Store (for identical ISO 1328-1:2013) | Purchase PDF | ~¥12,000 | More expensive than JIS version. | | National Standard Bodies (e.g., ANSI in USA, BSI in UK) | Resell as adopted standard | Varies | Often bundled with commentary. |
Important: Websites claiming to offer a “free PDF download” of JIS B 1702-1 (e.g., docplayer, pdfcoffee, chomikuj) are almost always uploading copyrighted material without authorization. Downloading from such sites may expose you to malware, outdated drafts, or legal liability in commercial use.
JIS B 1702-1 is a critical Japanese Industrial Standard (JIS) that specifies the accuracy requirements for cylindrical gears. As the Japanese equivalent of the ISO 1328-1 standard, it serves as the definitive guideline for gear manufacturers, quality control engineers, and designers working within the Japanese automotive, robotics, and heavy machinery industries.
This write-up explores the scope of the standard, its key technical parameters, and why obtaining the official PDF is essential for compliance.
Note that if you are doing calculations, you likely need two standards:
If you cannot find Part 1, look for Part 2 documents. Sometimes technical papers will include the geometric definitions from Part 2 alongside the stress definitions from Part 1 to provide a complete calculation example.