Strength

We have delivered fasteners with a strength exceeding class 15.9 for applications where down sizing, clamping force and strength are critical. In our product range we offer stainless fasteners ranging from strength class 8.8 to 16.9. Despite the high strength our unique materials offers a unique combination of ultra high strength and good ductility. Bumax Stainless steel fastners are resistant against hydrogen embrittlement.

 

High strength fasteners offers:

  • possibility to downsize the fastener  or reduce the amount of fasteners with maintained clamp load
  • weight saving
  • compact design and smaller screw joints
  • a fasteners that are able to withstand higher static or dynamic stresses
  • higher safety factor
  • higher resistance against relaxation

 

 

Mechanical properties

in as delivered condition for screws and bolts

Grade  Dimension Strength class Tensile strength Rm, min (MPa) Yield strength Rp0.2, min (MPa) Elongation, min (mm)
BUMAX 88 M3-M36 88 800 640 0.3 d
BUMAX 109 M3-M20 109 1000 900 0.2 d
BUMAX Nitro  up to M42 109 1000 900 0.2 d
BUMAX SA  up to M36 88 800 640 0.2 d
BUMAX LDX  up to M36 88, 109, 129 800, 1000, 1200 640, 900, 1080 0.3 d
BUMAX DX  up to M36 88, 109, 129 800, 1000, 1200 640, 900, 1080 0.3 d
BUMAX SDX  up to M36 88, 109, 129 800, 1000, 1200 640, 900, 1080 0.3 d
BUMAX HDX  up to M8 88, 109, 129 800, 1000, 1200 640, 900, 1080 0.3 d
BUMAX Ultra¹  up to M16 159, 169 1500, 1600 1350, 1440 0.2 d

The table should be used as a guide only of what is possible to achive in regards of mechanical properties and dimension for Bumax grades. Alteration might occur depending on design and dimension. Contact Bumax sales representative for more information.

 

1) Bumax Ultra is a grade that is tailor made to solve customer needs in regards of strength, ductility, fatigue and wear resistance. Values in the table are typical strength classes, but even higher strength can be achived on some designs and dimensions, up to tensile strength levels of approximatly 2500 MPa.

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