This standard defines the geometry and tolerances for involute splines based on three primary factors: : Expressed in millimeters (e.g., 35).

Common fits include Class 2 and Class 3 for major diameters, and Classes a through d for tooth flank fits (ranging from "loose" to "press" fits). Non-Interchangeability: It is important to note that JIS D 2001 splines are not interchangeable

It is vital to note that JIS D 2001 splines are with ANSI or ISO metric splines due to the specific 20-degree pressure angle and stub tooth height. The modern successor, JIS B 1603 , includes many of the JIS D 2001 specifications in its supplementary sections to ensure backward compatibility for repairs and replacements. Doppler Gear TechBit: JIS D 2001:1959

If you are a student or researcher, check with your university's engineering library. Many academic institutions have "reading rights" to JIS standards, allowing you to view the PDF online without paying for a permanent downloadable copy.