SWEBOLT & BOTNIA BOLT supply BUMAX 88 (1.4432) and BUMAX 109 (1.4432) hex bolts for environments where standard A4 stainless steel is not sufficient. BUMAX is a Swedish cold-formed stainless steel with high strength, corrosion, and fatigue resistance, equivalent to strength classes 8.8 and 10.9. The material is strain hardened to achieve high mechanical performance while maintaining ductility. Used in marine, chemical, energy, and process industries where traceability and reliability are essential. Supplied with EN 10204 3.1 certificates. Contact us for more information and technical support.