It is a flat washer according to DIN 440 or similar to ISO 7094. This large and thick framing washer is a derivative of the zinc-plated steel construction washer. It It is suitable for assembly work.
This type R washer has a thicker finish.
This wide washer is suitable for wooden constructions.
This flat washer is mainly used in the field of carpentry and wooden constructions, especially for the manufacture of shelters or pergolas. Its thickness facilitates assembly for heavier applications.