This part of GB/T 3478 specifies the dimensions and technical requirements of measuring rods for measuring the space width and tooth thickness of spur involute splines. This part is used to measure measuring rods of cylindrical spur involute splines with a modulus of 0.25 mm to 10 mm, a number of teeth of 10 to 100, and a standard pressure angle of 30°, 37.5° and 45°.
GB/T 3478.9-2008 Referenced Document
GB/T 321 Preferred numbers-Series of preferred numbers