SWEBOLT & BOTNIA BOLT supply acid-resistant (A4) hex bolts in strength classes A4-70 and A4-80, manufactured according to ISO 4017 / DIN 933, ISO 4014 / DIN 931, and DIN 6921 (flange bolts). The bolts are made from A4 stainless steel with metric coarse threads (M). The material provides excellent corrosion resistance and strength, making them ideal for marine, chemical, and outdoor environments.