Mechanical strength

Our product range includes ultra-high strength stainless steel fasteners with good ductility.

Ultra-high strength fasteners

We can deliver stainless steel fasteners ranging from strength class 8.8 to 16.9 for applications where downsizing, clamping force and strength are critical. Our products offer a unique combination of strength and good ductility. BUMAX Stainless steel fasteners are also resistant against hydrogen embrittlement.

Benefits of high strength fasteners:

  • Opportunities to downsize the fastener or reduce the number of fasteners with maintained clamp load.
  • Weight savings.
  • Compact design and smaller screw joints. Ability to withstand higher static or dynamic stresses.
  • Greater safety.
  • Higher resistance against relaxation.

Mechanical properties

The table below shows properties for screws and bolts in as delivered condition.

Grade Strength, min
TS/YS (MPa)
Steel
Standard
Fastener standard Micro structure C max Cr Ni Mo Other PRE
BUMAX 88 800/640 1.4432/36/35 A4 Austenitic 0.03 17 11.5 2.7 27
BUMAX 109 1000/900 1.4432/36/35 A4 Austenitic 0.03 17 11.5 2.7 27
BUMAX SA 800/640 1.4547, S31254 A8 Austenitic 0.01 20 18 6.2 N, Cu 43
BUMAX DX 129 1200/800 1.4462, S32205 D6 Ferrite-Austenitic 0.03 22 5.2 3.2 N 36
BUMAX SDX 109 1000/900 1.4410, S32750 D8 Ferrite-Austenitic 0.03 25 7 4 N 42
BUMAX SDX NORSOK 750/550 1.4501/1.4410 S32760/S32750 Norsok M630 MDS D60 Ferrite-Austenitic 0.03 25 7 4 N, W, Cu 42
BUMAX ULTRA 1500/1350 Martensitic 0.02 12 9 4 Al, Ti, Cu 25
BUMAX HE 1000/900 1.4980, S66286 Austenitic 0.08 15 26 1.5 Ti, V
BUMAX HEP 1000/600 2.4952, N07080 Austenitic 0.10 19 >65 Al, Ti, Co

The table is a guide for what can be achieved in terms of mechanical properties and dimensions for BUMAX grades. Deviations might occur depending on particular design and dimensions. Contact your BUMAX sales representative for more information.

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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