Marking of stainless steels screws and nuts | Bossard Sweden

Choose your country or region


South Africa

EN

Canada

FR EN

México

ES EN

United States

EN

Australia

EN

China / 中国

ZH EN

India

EN

South Korea / 대한민국

KO EN

Malaysia

EN

Singapore

EN

Taiwan

ZH EN

Thailand

EN

Česká Republika

CS EN

Danmark

DA EN

Deutschland

DE EN

España

ES EN

France

FR EN

Ireland

EN

Österreich

DE EN

Polska

PL EN

Schweiz / Suisse / Svizzera

DE FR IT EN

Sweden

EN SV

Global

EN

Please start typing to get suggestions.

Suggestions are being loaded.

Search suggestions

Product categories

Product suggestions

Marking of screws and nuts (according to ISO 3506)

Requirement

Screws and nuts made from stainless austenitic steels must be marked.

Caution

Only those fasteners marked to standard will have the desired properties. Products not marked to standard will often only correspond to property classes A2-50 or A4-50.

Screws

Hexagon head screws, and hexagon or hexalobular socket head cap screws from nominal diameter M5 must be marked. The marking must show the steel group, the property class and the manufacturer’s mark.

Studbolts

Bolts from nominal diameter M6 must be marked on the unthreaded shank with the steel group, the property class and the manufacturer’s mark. If marking on the on the unthreaded shank is not possible, marking on the nut-end of the stud with only the stainless steel group is allowed.

Marking of screws and nuts

Hexagon screws
Marking of screws and nuts
Socket head cap screws
Marking of screws and nuts
Nuts

Nuts and nuts with reduced load bearing capacity (low nut) must be labeled with the steel group, strength class and origin mark from thread M5.

 Marking of screws and nuts nuts

If the nuts of grades A2 and A4 are marked with grooves and the strength class is not specified, then the strength class 50 of 025 applies.

It is possible that certain nuts would not fulfil the proof load requirements because of fine pitch thread or the geometry of the nut. These nuts may be marked with the steel grade, but shall not be marked with the property class.

Marking of screws and nuts

Other markings

Screws with reduced load bearing capacity due to the head or shaft design that can be subjected to a tensile test are to be labeled with the strength class by the supplementary number 0.

Other markings

Screws that do not meet the requirements for tension and torsion strength due to their geometry and cannot be subject to a tensile test due to their short length may be labeled without the strength class.

Other markings

Other types of screws can be labelled in the same way where possible, but only on the head. Additional markings may be attached, provided this does not lead to confusion.