DIN 5471
DIN 5471 Machine Tools; Spline Shafts and Spline Bore Profiles with 4 Splines, Internal Centering, Dimensions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1974
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1974