Technical drawings. Representation of involute flanks, parallel and non-parallel keyways

This document establishes specific conventions for the graphical representation of involute, parallel, and non-parallel tooth sides in technical drawings. It provides a standardized framework used by engineers and designers to ensure clarity and consistency when illustrating gear geometries and transmission components. The text outlines precise rules for depicting tooth profiles, including methods for indicating pressure angles, addendum and dedendum dimensions, and the distinction between different types of side clearances. By adhering to these guidelines, various industries can facilitate accurate communication across international boundaries, eliminating ambiguity in manufacturing specifications. The content focuses on the geometric symbols, line types, and annotation techniques required for unambiguous interpretation of mechanical parts in production and inspection processes. This approach supports interoperability in the design phase and ensures that components fabricated in different locations meet the same functional requirements. The guidelines apply to the representation of spur gears, helical gears, and other mating elements where tooth side geometry is critical for performance.