Hexalobular internal driving feature for bolts and screws
This standard has been revised by ISO 10664:2014
ISO 10664:2005 specifies the shape and basic dimensions of the hexalobular internal driving feature for bolts and screws, including the gauging method. Its intent is to provide the details necessary for inspection of the hexalobular driving feature. It is not suitable for, nor intended to be used as, a manufacturing standard.