This International Standard specifies the characteristics of hexalobular socket cheese head screws of product grade A and with thread sizes from M2 up to and including M10. If, in special cases, specifications other than those listed in this International Standard are required, they can be selected from existing International Standards, for example ISO 261, ISO 888, ISO 898-1, ISO 965-2, ISO 3506-1 and ISO 4759-1.