SWEBOLT & BOTNIA BOLT supply hex bolts in BUMAX 88/109 and Duplex 1.4462, designed for environments with high strength and corrosion resistance demands. BUMAX (A4 Hi-Mo) provides high strength and corrosion protection compared to standard A4, corresponding to property classes 8.8 and 10.9. Duplex 1.4462 offers higher mechanical strength and excellent resistance to pitting and crevice corrosion, ideal for marine, chemical, pulp, and energy industries.