Fastening elements out of stainless steel 1.4539 (HCR), 1.4529 (HCR, A8)


As an industry specialist in the manufacture of stainless steel screws, we advise, develop and produce the perfect fastener for your application in addition to the existing stock range. Just ask us.

We are your manufacturing specialist:

  • We provide the right design for you, tailored to feasibility and your individual requirements.
  • Selecting the right material to ensure the required properties for the right material costs
  • Possible dimensional ranges:
    • Nominal diameters: 3 to 12 mm
    • Nominal lengths: 6 to 330 mm

Highly corrosion-resistant stainless steels

Stainless steel 1.4539 and 1.4529 A8 demonstrate a higher level of resistance to corrosion and acid (HCR) than A2 or A4 stainless steels.

Fasteners made of A5 are used in atmospheres containing chlorine, such as indoor swimming pools, or in coastal areas directly affected by spray water, for example boat jetties.

Stainless steel A8 1.4529 (also known as super austenitic stainless steel) is an enhanced version of the material 1.4539 and is characterised by its particularly high resistance (CRC V) to localised types of corrosion, such as chlorine-induced crevice, stress or pitting corrosion. Furthermore, it has good polishing and mechanical properties and can be used in a wide range of temperatures. For this reason, the use of this material to fasten load-bearing components is mandatory in certain sectors.

The materials have technical approval from the Deutsches Institut für Bautechnik (DIBt, national approval no. Z-30.3-6, dated 05/03/2018).

This approval states that the use of stainless steel with CRC class V, such as our 1.4529 material, is recommended or may even be mandated for load-bearing fasteners, connectors and threaded parts.

Additional key mechanical properties for corrosion-resistant connectors can be found in the following currently applicable standards: DIN EN ISO 3506-1:2020-08 for screws, DIN EN ISO 3506-:2020-08 for nuts and in the first edition of ISO 3506-6:2020-04.

Screw manufacturing Stainless steel 1.4529

Demanding environments need special materials

For our customer MT Højgaard Danmark, we produced screws from highly corrosion-resistant stainless steel 1.4529. We followed the entire production process on camera:

From the technical drawing to the pressing of the wire pins, right through to every quality check, we recorded every step for you. It took around 4 weeks of pure production time for the screws to leave our warehouse last week.

The screws were developed together with Jaap Aanhaanen from Cowi and Morten Ahlberg MT Højgaard Danmark for a unique construction project in Copenhagen, Denmark 

Immerse yourself in the world of screw production.


Paper and pulp industry


Chemical industry, food industry, construction industry, agriculture


Medical technology


Environments containing hot acids, e.g. lactic acid


Atmospheres containing chlorine,
swimming pools and bathroom equipment


Use in seawater or
brackish water, offshore technology


Tunnel and car park construction


Stainless steel designations

Material no. Steel quality ISO 15510/DIN EN 10088-1 Steel number DIN EN 10088-5 short name
1.4539   4539-089-04-I X1NiCrMoCu25-20-5
1.4529 A8 4529-089-26-I X1NiCrMoCuN25-20-7

Material no. Line UNS Alloy
1.4539 AN52A N08904 904L
1.4529 AN52A N08926 926

Material no. Tensile strength Rm (N/mm²) Elasticity limit/yield strength Rp 0.2 (N/mm²) Hardness in HB
1.4539 min 530 bis 730 ≥ 230 ≥ 230
1.4529 min 650 bis 850 ≥ 300 ≤ 250

Material no. CRC range Density (kg/m³) Magnetisability
1.4539 IV -60°C to 400°C 8,0 low
1.4529 V -196°C to 400°C 8,1 not available


Simon Rydel

Head of the Industry Division

How to contact us