This standard specifies product grade A hexagon socket thin head cap screws with ISO metric screw thread from size
M3 up to and including size M 24.

If, in special cases, the screws are to meet requirements other than those given in this standard, e.g. with regard to property class or material, these shall be selected in accordance with the appropriate standard. This also applies to the fine pitch thread conforming to DIN 13 Part 13 required in exceptional cases.

Owing to their head dimensions, screws complying with this standard are interchangeable with screws specified in DIN 84.

The critical cross section of screws covered by this standard can, as a consequence of the head geometry and the form of the wrench engagement, thus be located below the hexagon socket and not in the thread. This particularly applies for fine pitch thread screws and/or where tolerance positions are unfavourable (see also Explanatory notes). It is thus recommended that the screws should not be used for the transmission of high axial loads involving prestressing.

If a DIN 911 double offset screwdriver is used to tighten the screws by way of their socket, the design of the key only permits the application of prestressing loads corresponding to 70 % of the minimum yield point specified for property class 8.8 screws.

These screws may not be used in the form of screw assemblies with captive washers as specified in DIN 6900, as the corresponding components (e.g. washers) would require small radii below the screw head, which could seriously weaken the cross section in the zone below the hexagon socket and lead to screw failure.