Basic geometry including pitch, pressure angle, and number of teeth.
Specific classes (Classes 4 through 7) that allow manufacturers to balance precision with cost-effective production. ansi b 92.1 pdf 38
Two primary types— Side Fit (where the teeth touch on the flanks) and Major Diameter Fit (where the shaft and hub center on the outer diameter). Key Specifications and Geometry Basic geometry including pitch, pressure angle, and number