This International Standard establishes the graphical symbols for elements of kine-matic diagrams of products in all branches of industry. The symbols established by this International Standard are to be used on diagrams in technical documentation, as well as in technical and educational literature. This International Standard is being published in three parts, as follows: Part 1 1 Motion of links of mechanisms 2 Kinematic pairs 3 Links and connections of their components 4 Linkage of bars and their links Part 2 5 Friction and gear mechanisms 6 Cam mechanisms Part 3 7 Geneva and ratchet mechanisms 8 Couplings, clutches and brakes