DIN ISO 4156-2:2026-01

This document specifies geometry and inspection dimensions for the design and manufacture of straight (non-helical) side-fitting cylindrical involute splines. Limiting dimensions, tolerances, manufacturing errors and their effects on the fit between connecting coaxial spline elements are defined and tabulated. Linear dimensions are expressed in millimetres and angular dimensions in degrees. The specified diameters for external splines in the geometry tables and the values in the inspection dimension tables are only valid for fundamental deviation "h". For fundamental deviations other than "h", diameters and tooth thicknesses are calculated for external splines according to the formulae in ISO 4156-1 and inspection dimensions according to the formulae in ISO 4156-3. This document contains the German translation of the International Standard ISO 4156-2:2021, which has been prepared by Technical Committee ISO/TC 14 "Shafts of machinery and accessories", the secretariat of which is held by DIN (Germany). The responsible national standardization committee is Working Committee NA 060-34-31 AA "Passverzahnungen" ("Splines") at DIN Standards Committee Mechanical Engineering (NAM).