Tangential keys and keyways

This technical specification outlines the dimensional and geometric requirements for tangential keys and their corresponding keyways used in mechanical power transmission systems. It defines the profile, tolerances, and surface finish criteria necessary to ensure proper fit and alignment between shafts and mounted components such as gears, pulleys, or couplings. The document provides detailed illustrations of standard cross-sections and establishes limits for dimensional accuracy to prevent operational failures due to excessive clearance or interference. It serves as a reference for manufacturers designing mating parts and for quality control personnel inspecting finished assemblies. The guidance covers both single and dual key configurations, addressing specific scenarios where torque transmission occurs without relying on axial forces. By adhering to these specifications, industries can achieve consistent interchangeability and reliable performance across various machinery applications. The standard focuses exclusively on the physical attributes and measurement methods required for these components, omitting any discussion on installation procedures or material selection beyond what is necessary for dimensional compliance.