GB/T 3478.3-1995

This standard provides the dimension tables for straight cylindrical involute splines with a 37.5° pressure angle, specifying the required measurements for tooth profiles, pitch, and fit tolerances. It is applied in mechanical engineering for the design and manufacturing of spline connections in automotive transmissions, industrial gearboxes, and power transmission systems where precise torque transfer and alignment are critical. The standard ensures interchangeability and compatibility between splined shafts and hubs across different manufacturers and applications.