Do not guess the root fillet radius or the major diameter. Open the PDF to the section on "Dimensions for Metric Module Splines." Input the exact values from the Standard into your CAD software's equation manager or spline generator (e.g., Inventor, SolidWorks, or Creo).
The standard (often searched as ANSI B92.2 PDF ) is a critical engineering specification governing metric module involute splines. Maintained by SAE International and approved by the American National Standards Institute (ANSI), this standard provides structural data, design equations, and inspection requirements for straight, non-helical cylindrical involute splines. ansi b92.2 pdf
Db=D×cos(α)cap D sub b equals cap D cross cosine open paren alpha close paren (Where Do not guess the root fillet radius or the major diameter
