What do stainless steel types A2 and A4 mean?

We regularly get asked what the difference is between stainless steel types A2 and A4. Which is better?

When it comes to fasteners, we also refer to stainless steel 304 (type A2) and stainless steel type 316 (A4).
The difference between these two types is their degree of corrosion resistance. For example, stainless steel type A4 (316) has a higher corrosion resistance, making it suitable for use near seawater and chlorine.

Both types of stainless steel are therefore suitable for outdoor use.

Galvanized steel (steel bolts/anchor plates) is perfectly suited for indoor use and, to a limited extent, in slightly damp areas. Because galvanized steel is a pure steel, it is slightly stronger than stainless steel and can therefore handle a higher load.

For a more detailed explanation of its use, see the Knowledge Base: Knowledge Base: General canyoning and caving equipment / Why do you use stainless steel materials in canyoning/caving?

FAQ overview: Go back.

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