A4 thick washers in accordance with the DIN 7349 standard are washers used to distribute the load evenly over a larger surface during assembly. These washers are made of A4 acid-resistant stainless steel, which gives excellent corrosion resistance and a long service life, especially in environments with high humidity or exposed to chemical influences. The thickness of the washers gives extra strength and stability to the fastening process. The washers are typically used in construction projects, machine building and the maritime industry.