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Labelling

Fasteners may be labelled and/or described in accordance with the aforementioned designation system only when all of the requirements of the DIN EN ISO 3506-1 have been fulfilled.

Screws

All hexagon head screws and cheese head screws with a hexagon socket or six lobe drive and a thread diameter ≥ 5 mm must be labelled as shown below. This labelling is mandatory and must contain the steel type, the property class and additionally the manufacturer reference. Other screws can be labelled in the same way wherever possible (but only on the screw head). Additional labels may be affixed if they do not cause confusion.

A Hexagon head screws
B Cheese head screws with hexagon socket or six lobe drive

1) Manufacturer reference
2) Steel type
3) Property class

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Studs

Studs with a thread diameter ≥ 5 mm must also be labelled as shown below. The labels must be placed on the thread-free part of the stud and contain the stamp of origin, the steel type and the property class. Should labelling not be possible on the thread-free section, only the indication of the steel type on the cap at the end adjacent to the nut is permissible as labelling.

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Nuts

It is mandatory for nuts with a thread diameter ≥ 5 mm to be labelled with the stamp of origin, the steel type and the property class if this is technically possible. Labelling on the supporting surface is permissible; in this case it may be affixed only in sunken form. Labelling on the key surfaces is also permissible if this is preferred. If the nuts are labelled with grooves (for the materials) and the property class is not indicated, the property class 50 or 025 applies.

A Nuts, high type
B Nuts, thin type

1) Manufacturer reference
2) Steel type
3) Property class

C Alternative Labelling with grooves (A 2 / A 4 only)

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