This Standard provides data and guidance for the design, manufacture and inspection of straight (non-helical) cylindrical involute splines with side fit. It establishes a specification based on the module within the range 0.25 to 10 inclusive, relating to nominal pressure angles of 30 degree SIGN, 37.5 degree SIGN and 45 degree SIGN. (For electronic data processing purposes, the form of expression "37.5 degree SIGN" has been adopted instead of 37 degree SIGN 30'.) Limiting dimensions, tolerances, manufacturing errors and their effects on the fit between connecting co-axial spline elements are defined and tabulated. Linear dimensions are expressed in millimetres and angular dimensions in degrees.

ISO 4156:1981 - Identical