Tensile & proof load
Every property class is verified against ISO 898-1 — the values in the table below are what the marking on the head promises.
Quality
Certified where it counts, tested where it matters.
ISO 9001 and ISO 14001 across the group, IATF 16949 at the automotive plant in Sarzedo, and mechanical and corrosion testing behind every property class printed on the box. Mill test certificates come with project supply on request.
Control
What is checked, and against what
Hardness
Core hardness after quenching and tempering, the check that separates a genuine 10.9 from a re-marked 8.8.
Torque & friction
Tightening behaviour of the coated fastener, so the installed clamp load matches the specification.
Salt spray
Coating systems qualified to ASTM B117 — up to 4,000 hours to red corrosion. See Coatings.
Sulphur dioxide
Kesternich cycling to DIN 50018 for industrial and chemical atmospheres: 10 cycles free of red corrosion on Nanotec 10K.
Traceability
Batch traceability from wire to coated part, with mill test certificates issued for structural and project supply.
Reference
Property classes at a glance
Minimum values to ISO 898-1 for steel, ISO 3506 for stainless. Ask us when a drawing calls for a class and you need the equivalent in another standard.
| Class | Tensile, MPa | Yield, MPa | Typical use |
|---|---|---|---|
| 4.8 | 400 | 320 | Low-duty carbon steel |
| 5.8 | 500 | 400 | General assembly |
| 8.8 | 800 | 640 | The structural workhorse |
| 10.9 | 1,040 | 940 | Alloy steel, quenched and tempered |
| 12.9 | 1,220 | 1,100 | Highest standard class |
| A2-70 | 700 | 450 | 304 stainless |
| A4-80 | 800 | 600 | 316 stainless, marine |
Compliance
Substances, environment and the paperwork
Hexavalent-chromium free
The Nanotec systems carry no hexavalent chromium — a requirement on most European and automotive projects.
RoHS and REACH
Compliant coatings, declared in CISER's technical literature and available in writing for tender files.
Export documentation
Certificate of origin, mill test certificates and the full export set prepared in Dubai with each shipment.
Need the certificate before the order?
Tell us the standard your consultant is asking for and we will get the document from the plant.