The "Cylindrical Straight Tooth Involute Splines (Metric Module Tooth Side Fits) (Part 9): Measuring Rods (GB/T 3478.9-2008)" mainly refers to ISO 4156-2:2005 "Cylindrical Straight Tooth Involute Splines (Metric Module Tooth Side Fits) - Part 2: Dimensions", which is a revision of GB/T 3478.9-1995 "Cylindrical Straight Tooth Involute Spline Measuring Rods". The main changes in this section compared to GB/T 3478.9-1995 are as follows: 1. The standard name has been modified from "cylindrical involute spline measuring rod" to "cylindrical involute spline (metric module tooth side fit) Part 9: measuring rod"; 2. Revised the errors in the original standard and made editorial changes according to GB/T 1.1

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