BUMAX® DX 129 is a high strength duplex stainless steel fastener with excellent corrosion resistance.

Ultimate choice for strength, ductility and corrosion resistance

BUMAX® DX 129 is the ultimate choice for applications where very high strength, ductility and corrosion resistance is required. BUMAX® DX 129 can replace coated 12.9 carbon steel bolts in demanding applications with excellent results.


  • Very high strength – tensile strength min 1,200 MPa, Yield strength min 1,080 MPa.
  • Elongation – is significantly better than 12.9 carbon steel. Despite its high strength, elongation is comparable with A4-70 (minimum 0.4 x d).
  • Excellent corrosion resistance – PRE >34, compared with A4 (316L) that has PRE 25.
  • Very good fatigue properties – compared to A4 and carbon steel 12.9.
  • Lower thermal expansion coefficient – compared with austenitic stainless steels.
  • All our products offer full traceability with 3.1 certificates on request.


UNS S32205

EN 1.4462

Order BUMAX® DX 129

Contact us to find out more about BUMAX® DX 129, and how the grade can benefit your operations.

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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