scope:

This standard applies to involute spline joints based on reference diameters for connecting hubs and shafts with either a removable connection, a sliding fit or a permanent fit.

It lays down the following general principles:

a) standard pressure angle of 30°;

b) the basic rack profile is the same for all pitches, therefore applying a uniform design rule to all profiles;

c) side fit profile (a diameter fit is permitted in exceptional cases);

d) addendum modification is used to achieve favourable nominal dimensions;

e) The fit system includes tolerances for effective form deviations so that the effect of such deviations on backlash is taken into account. The variety of fundamental deviations and tolerance classes that can be selected takes due consideration of all requirements.

Involute spine joints as in this standard are used for connecting hubs and shafts with either a removable connection, a sliding fit or a permanent fit. They have all the characteristics required for transmitting torques and centring the parts, and meet all the conditions for economical manufacturing.

Theoretical hub and shaft root diameters apply for h_fP = 0,55 ⋅ m. The dedendum varies according to the manufacturing method used and has various values (see DIN 5480-1, Table 3). The root diameters depend on the dedendum