This standard stipulates the basic type of involute internal spline gear shaping cutter with a module of 1mm-10mm and a standard pressure angle of 30°, which is used to process flat top internal splines specified in GB/T 3478.1 and GB/T 3478.2. and size. The accuracy grades of involute internal spline shaper cutters are divided into Grade A and Grade B. This standard applies to involute internal spline gear shaping cutters.