Nominal dimensions of the key according ISO 773; keyway tolerances in plastic sprockets may differ from ISO 773 due to material properties.
Idler sprockets and drums are optimised for shafts with diameter tolerance of h9
single hinge straight run, single hinge Magnetflex. Note: not for heavy duty tab
This 29 tooth sprocket doesn't use a keyway, but a 12 mm round pin mounted through the shaft
