This International Standard specifies hexalobular socket countersunk head bolts and screws with high head (full loadability), of product gradeA, and thread diameters from M3 up to and including M10 and property classes4.8, 8.8 and 10.9.
NOTE1 In comparison with ISO common countersunk head, the height of the head has been slightly increased in order to have screws with full loadability, in conformity with the mechanical properties specified in ISO898-1.
This International Standard also specifies gauge dimensions for the control of the head dimensions.
NOTE2 Because of the increased head height, these screws are not fully interchangeable with other countersunk ISO metric screws. The assembled parts also need a slightly deeper countersink than those specified in ISO15065.
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 ISO261, ISO888, ISO898-1, ISO965-2 and ISO4759-1.