according to ISO 898, part 1

Marking of fasteners
1) The dot in the marking symbol may be omitted.


Identification with the manufacturer’s mark and the property class is mandatory for hexagon screws 4.6 to 12.9 and hexagon or hexalobular socket head cap screws 8.8 to 12.9 with thread diameter d ≥ 5 mm, where the shape of the screw always allows it. (Marking of bolts and screws are preferably on the head).

Marking of fasteners

For the purpose of providing services, this website uses cookies. You will consent to this by clicking on “OK” and/or using our services.
Please click on privacy policy to find the information on cookies and the possibilities for modifying the terms of their storage.