And it's stainless.
Tensile strengths up to 1500 MPa in stainless steel. Performance that no other manufacturer can match.
Full material traceability, 3.1 certificates, and documented testing. Every fastener, every batch.
Corrosion resistance that outlasts conventional fasteners by decades. Reducing lifecycle cost and environmental impact.
Precision-engineered stainless steel fasteners
ISO 4014 / ISO 4017
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ISO 4762
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ISO 4032 / ISO 4033
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DIN 976 / DIN 938
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ISO 7089 / ISO 7093
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All-metal prevailing torque
→From standard austenitic to ultra-high-strength martensitic, BUMAX offers seven proprietary stainless steel grades. Each engineered to push the boundaries of fastener performance.
Explore All Grades →Offshore platforms, subsea equipment, and refinery applications.
Hull fittings and underwater installations.
Wind, solar, and nuclear power systems.
Engine components and EV batteries.
Aircraft structures and satellites.
Reactors and aggressive environments.
In the forests of central Sweden, where iron has been forged since the 17th century, a small town called Ashammar became the birthplace of something extraordinary. Since 1660, the tradition of steelwork has been passed from generation to generation.
In 1899, a dedicated bolt factory was established here — beginning a journey that would lead to the creation of the world's strongest stainless steel fastener. Today, over 70 specialists continue that legacy.
BUMAX fasteners have been critical to our offshore operations. The combination of strength and corrosion resistance has allowed us to reduce maintenance intervals significantly while improving safety margins.— Fastener Engineering Lead, North Sea Operations
Whether you need standard fasteners from stock or a custom-engineered solution, our specialists are ready to help with deep technical expertise and a global network.
Tell us about your application. Our team typically responds within 24 hours.