Stainless steels

Benefits of stainless fasteners

Stainless fastener’s
Benefits in comparison to steel/galvanised fasteners
Clear surface, exquisite appearance. Rusty screws give a bad quality impression on the entire end product.
Safety Corrosion reduces the strength and usability of the fasteners.
No rust marks Red rust can, for example, stain plastic parts or textiles. A stainless fastener is
easy to clean and, and it is hygienic.
No health risks Cutting oneself with a rusty part can lead to blood poisoning.
Galvanised fasteners must be kept separate from contact with food
and out of reach of children (licking).
Austenitic chrome-nickel steels are almost
fully non-magnetic.
The use of magnetic fasteners, for example in measuring devices, can cause
distortions of measurement results.
Good heat resistance At temperatures above 80 ° C, the chrome plating of zinc is destroyed, resulting in significantly reduced
corrosion protection.
Serviceability Rusty screws and nuts are difficult to open and require extra work and
effort. In order to open the joint, it often has to be broken up, so that there is also
a risk of damaging the connected parts.

Stainless fastener grades

The most common stainless grade in, e.g. chemical industry and household appliances. Stainless, acid-proof and weldable. Not suitable for non-oxidising acids or chlorine-containing conditions, e.g. seawater.
Universal screws, sheet metal screws, hex screws, nuts, washers…a wide selection of fastening products.
The most common acid-proof grade. Resistant to several acids depending on temperature, reasonably resistant to chlorine-containing conditions. Good weldability. Widely used in the wood processing, food and shipbuilding industries.
Non-magnetic, non-hardenable. Cold resistance up to -60 °C.
Universal screws, sheet metal screws, hex screws, nuts, washers…a wide selection of fastening products.
Quite good corrosion resistance after surface treatment (e.g. Delta-Magni or corresponding micro-coating).
Hardenable grade. Magnetic.
Terrace screws, drilling screws, sheet metal screws… generally construction products that need to be hardened.

The effect of temperature on corrosion: The chemical composition and temperature of the operating conditions have a significant effect on the durability of stainless steel.

Friction factor: The stainless steel surface has a high friction factor (ca. 0.4–0.5). This often requires the use of lubricants when installing or waxing the product.