The tolerances outlined in JIS B 1702-1 apply to gears within specific geometric ranges: 5 mm to 15,000 mm. Normal Module ( ): 0.5 mm to 70 mm. Number of Teeth ( ): 5 to 1,000. Helix Angle ( ): Up to 45°. Comparison with Related Standards
The standard provides allowable values for several critical gear metrics: Single Pitch Deviation (
If you are designing gears for an international market, understanding how JIS B 1702-1 differs from other standards is critical.
The difference between the actual pitch and the theoretical pitch. Total Cumulative Pitch Deviation ( cap F sub p The maximum deviation across all teeth in the gear. Total Profile Deviation ( cap F sub alpha The total error in the shape of the tooth profile. Total Helix Deviation ( cap F sub beta
For further information on Jis B 1702-1 pdf and related topics, we recommend the following resources:
: A technical preview of the JIS B 1702-1:2016 is available via the Japanese Standards Association (JSA) .
The standard moves away from older "tooth-to-tooth" error measurements and focuses on the deviation of the flank surface. The key parameters defined in JIS B 1702-1 include: