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BUMAX® is Bufab’s registered trademark and premium brand of stainless steel fasteners. We have been producing Stainless Fasteners in Sweden since 1899. Our products meets the highest demands when it comes to quality, corrosion resistance, fatigue strength, traceability and heat resistance. We deliver safety and reliability in the world of fasteners there is no one better.

BUMAX® New Generation are completely unique and cannot be found anywhere else on the market. They are the ideal solution in a range of diverse industries from offshore to particle accelerators where conditions can be extreme. We can offer solutions for all industries where stainless steel should be considered or specified.

All BUMAX® products are manufactured from premium European stainless steel manufacturers according to rigid specifications and come fully traceable. We also test and certify the finished product not the raw material prior to manufacture therefore we can guarantee the performance of every product unlike other popular methods available.

Stainless steel fasteners have properties which make them attractive choice for a wide range of applications. It is essential to consider the required properties such as corrosion resistance, temperature resistance, mechanical strength and magnetic permeability. Correctly chosen material will guarantee a trouble-free life time. see below for our current materials.

BUMAX 88 offers better corrosion resistance than standard A4. Bumax 88 is a very consistent material that offers higher yield strength and lower amount of inclusion than standard A4 fasteners, that gives superior mechanical properties and fatigue resistance. Bumax 88 fasteners are used in many applications that demands very low magnetic permeability, it has lower magnetic permeability and less variation from batch to batch compared to standard A4 fasteners.

Bumax AB is certified by TUV Nord according to EN 15048 and BUMAX® 88 products can be supplied as a “structural bolt” with CE marking . The bolts will also be hard marked with “SB” according to the standard. CE marked structural bolts is not a standard product as it requires additional testing and marking compared to standard Bumax 88.

BUMAX 109 is the strongest A4 bolt on the market. Same material as Bumax 88 but higher strength due to special manufacturing process.

BUMAX Nitro, austenitic stainless steel with high nitrogen content, characterized by very high strength and fatigue resistance, in combination with good corrosion resistance. Excellent material for marine application and can be supplied in strength class 12.9 up to M42.

BUMAX Super Austenite (SA), high-alloy austenitic stainless steel for seawater and other aggressive chloride bearing medias. Excellent resistance to general, crevice, pitting and stress corrosion.

BUMAX Lean Duplex (LDX) offers economical solution for high strength fasteners in medium corrosive environments.

BUMAX Duplex (DX) are characterized by excellent strength, ductility and fatigue resistance in combination with good general, pitting, crevice and stress corrosion properties.

BUMAX Super Duplex (SDX) are characterized by excellent mechanical properties and very good corrosion resistance. Excellent resistance to general crevice, pitting and stress corrosion in chloride bearing medias.

BUMAX Hyper Duplex (HDX), a groundbreaking alloy used in the most demanding applications. Suited for use in severe corrosive environments such as hot chlorinated sea-water and for aggressive acidic chloride containing media in chemical, oil/gas, marine and petrochemical industry.

BUMAX Ultra, a unique stainless steel that can be delivered in ultra high strength levels. Offers an unique combination of ultra high strength combined with excellent ductility and good corrosion resistance in chloride environments. Strongest stainless steel fastener on the market.

BUMAX Heat (HE), high temperature resistant material for applications requiring high strength and good oxidation resistance at temperatures up to 700°C.

BUMAX Heat Plus (HEP), high temperature resistant material with excellent oxidation resistance and high tensile and creep properties at temperatures up to 815°C.

Other special grades can be offered on request.

We work constantly to find the best fastener solutions with our customers and are eager contribute at an early stage in development projects. Thanks to our expertise in fasteners and material we have developed many extraordinary nuts and bolts for special uses. Your problem is our challenge!

Bumax starts where standard ends! A BUFAB brand

Main Contact Details

Unit 49 Heming Road
Washford Industrial Estate
United Kingdom
B98 0EA

T: 08444 123 201


Fasteners:  BoltsCirclipsCladding fastenersFasteners – generalHingesHoseclips, Jubilee clips, NutsRivetsScrewsStuddingStudsWashersSpecialised fastenersNon-standard fasteners

Aerospace:  Aerospace fasteners


Surface Treatment:  Coating, Protective coating

Testing Services:  Chemical analysis, Corrosion testing, Failure analysis, Mechanical testing

Primary Processing:  Forging

Design Services:  Product design

Forming:  Cold section rolling