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Marking of stainless screws and nuts


The marking of stainless screws and nuts must contain the steel group, strength class and manufacturer's sign.

 
Marking of screws according to DIN ISO 3506-1

Hexagonal screws and socket cap screws with hexagonal socket as of an M5 nominal diameter should be clearly marked according the marking system. Where at all possible, the marking should be placed on the screw head.

Fig. C: Extract from DIN EN ISO 3506-1


Marking of nuts according to DIN EN ISO 3506-2

Nuts with a thread nominal diameter as of 5 mm should be clearly marked according the following marking system. Marking on just one bearing surface is permitted and may only be used if recessed. Marking on the spanner flats is also possible.

Fig. D: Extract from DIN EN ISO 3506-2