DIN 5480-2:2025-10

This document is applicable to involute spline connections based on reference diameters for detachable, slidable, or fixed connection of shafts and hubs and specifies the following generalities: a) uniform pressure angle of 30°; b) the same reference profile for all pitches, resulting in a uniform generating rule for all profiles; c) flank centering. In exceptional cases, diameter centering; d) use of profile corrections to achieve specific reference diameters; e) the fit system includes tolerances for effective form deviations, so that their influence on the fit clearance is taken into consideration. All requirements are met through the possible selection of different dimension series and tolerance classes. Involute spines as described in this document are used for detachable, slidable, or fixed connection of shafts and hubs. They have the properties required for torque transmission and centering and meet the conditions for economical manufacturability. Theoretical hub and shaft root diameter for hfP = 0.55 × m. The dedendum varies as a function of the manufacturing process and assumes different values (see DIN 5480-1:2025-08, Table 3). The root diameters depend on the dedendum. The standard differs from DIN 5480-2:2015-03 as follows: a) Clause 4 "Symbols, abbreviations, and indices" has been revised; b) the labeling in Figure 3 has been changed; c) the labeling in Figure 5 has been changed; d) index 1 has been added to equations (1) through (6); e) the label in Figure 6 has been changed; f) index 2 has been added to equations (7) through (12); g) Table 1 "Fillet radii and dimensioning factors" has been deleted; h) bibliography updated; i) the document has been editorially revised. This document has been prepared by Working Committee NA 060-34-31 AA "Passverzahnungen (SpA ISO/TC 14 und ISO/TC 14/WG 1)" ("Splines (mirror committee to ISO/TC 14 and ISO/TC 14/WG 1)") of Technical Section "Gear" at DIN Standards Committee Mechanical Engineering (NAM). Representatives of manufacturers and users of "splines" participated in its preparation.