There are many different grades of Stainless Steel. The most common are 304 and 316. Some fasteners are also made in 303, 410, 420 and 430 as well as more corrosively resistant grades such as Bumax (2343) and 2205. Click here to find how Stainless Steel works.
The following is an approximate guideline.
|Stainless Grades||PREN Values||Features/Benefits||Useful For||In Action|
|410 SS||11||A Martensitic grade that can be hardened by heat treatment||Self-drilling (into metal) screws in non-coastal and less corrosive environments (e.g. interior use)|
||Spring pins in less corrosive environments|
||Self-drilling (into metal) screws.|
||A variety of applications, including interior and non-coastal exterior applications which are hidden from sight (as it may tea-stain)|
|BUMAX 88 & 109||25||
||Where high strength and excellent corrosion resistance is required.|
||Situations requiring high strength and very high corrosion resistance such as constant salt water immersion|
|WARNING! BEWARE OF LOW NICKEL STAINLESS STEEL
Some proprietary grades with high manganese and low nickel have found their way onto the market and are being sold as 304 or 316. Some are even stamped as such. These alloys also have low chromium and are not suitable for Australia's harsh conditions - especially coastal environments.
|Environment||Type 304||Type 316|
|Seafront||Grade not recommended||Monthly|
|Coastal (within 5km of the coast)||Grade not recommended||6-12 months (wire: monthly)|
|Industrial and Urban||3-6 months||6-12 months (wire: 2-12 per year)|
|Suburban Rural||Annually or as required by experience|
|Internal||As required to maintain appearance|