BUMAX® 109

BUMAX® 109 is your first choice for better corrosion resistance and strength in demanding applications.

The strongest fastener on the market

BUMAX® 88 and BUMAX® 109 have the same material composition but due to different manufacturing processes, BUMAX® 109 provides even higher strength than BUMAX® 88 and is the strongest A4 fastener on the market.

Fasteners with enhanced properties

BUMAX® 109 outperforms standard A4 fasteners in terms of:

  • yield strength
  • corrosion resistance
  • mechanical properties
  • magnetic permeability

These enhanced properties are achieved through a higher molybdenum content (minimum 2.5%), our unique manufacturing processes and sourcing of highest quality European raw material. In addition, all our products offer full traceability with 3.1 certificates on request.

Fasteners for demanding applications

BUMAX® 109 fasteners are used for water jets, sub-sea equipment, pumps, valves, wind turbines, high-pressure equipment, nuclear plants, submarines, particle accelerators and many other applications where commodity A4 fasteners are inadequate. As a result, BUMAX fasteners provide greater safety and will last significantly longer than standard A4 fasteners.


UNS: S31603

EN: 1.4432, 1.4436, 1.4435

Order BUMAX® 109

Contact us to find out more about BUMAX® 109, and how it can benefit your applications.

BUMAX is available worldwide

Our extensive network of sales offices and distributors makes it easy to get in touch with us. Find your local sales office or distributor below. For other countries not represented, please contact our Main Sales Office.

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