This part of the UNE 18-076 standard, Measurements, gives, in the form of tables, the measurements based on the adjustment class H/h, which gives a minimum effective play equal to zero of the involute profile cylindrical splines, metric module, centered on flanks. The range of moduli to which it applies is 0.25 to 10 inclusive, related to nominal pressure angles of 30°; 37.5°2)and 45°. Linear measurements are expressed in millimeters and angles in sexagesimal degrees.