Splines governed by this standard are measured in imperial units (Diametral Pitch). They are preferred over straight-sided splines because they are self-centering and possess higher strength at the tooth base. standard - ansi b92.1-1996
The ANSI B92.1 standard (most commonly referenced in its or 1996 revisions) provides comprehensive guidance for straight (non-helical) involute spline teeth. It defines: ansi b 92.1 pdf 38
Basic geometry including pitch, pressure angle, and number of teeth. Splines governed by this standard are measured in
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