ISO 4156-3:2021 pdf download – Straight cylindrical involute splines — Metric module, side fit — Part 3: Inspection. 1 Scope This document provides data, guidance and requirements for the inspection of straight (non-helical) side fitting cylindrical involute splines. Limiting dimensions, tolerances, manufacturing deviations 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. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references,...