A Grade 5 in the new system does not equal a Class 5 in the old system. For example, an old Class 1 gear roughly corresponds to a modern Grade 5 or Grade 6, depending on the specific diameter and module of the gear. Always check the revision year noted on your engineering blueprints. Critical Gear Deviations Defined in JIS B 1702-1
Released under the authority of the Japanese Standards Association (JSA), this standard specifies: jis b 1702-1 pdf
: Avoid downloading free PDFs of this standard from unverified websites. Many such files are outdated, incomplete, or of poor quality. Furthermore, downloading copyrighted material without payment is often illegal and unethical. Stick to official sources to ensure you have the correct, legally obtained document. A Grade 5 in the new system does
