The addition of molybdenum in A4 improves its resistance to pitting. Generally, grade A4 stainless screws tend to be easier to fabricate, clean, finish, and weld. This is because the chemistry of A4 differs from A2. Moreover, the high alloying content makes it more expensive than grade stainless steel.
However, in consideration of the larger picture, these screws are an investment. And so many buyers find them as a more cost-effective solution in comparison to grade , over a longer period of time, simply because they lack requirements that would otherwise be necessary, as like in grade A2 fasteners such as maintenance or replacement, especially when they are used outside. The use of A4 material is considered to be vital in environments where resistance to pitting or even environments that contain caustic solutions, because of the resistance of the material to it.
The higher content of chromium enables the stainless steel alloys to build a protective, self passivating oxide layer on their surface, which protects them from corrosion like oxidation corrosion or even pitting. The resistance to creep, creep strength properties as well as corrosion resistance properties of stainless steel grade A4 is what permits these screws to deliver a good performance at elevated temperatures without the occurrence of failure.
Identification of screws is made possible by the markings done on the head. Both A2 and A4 stainless steels are mostly non-magnetic. Some magnetism can be induced by the cold working process and also by welding.
There can also be Titanium present in A4 stainless at the option of the manufacturer. Common Properties Both A2 and A4 grades are classed as Austenitic stainless steel sometimes called the series. This means that they have high chemical resistance but cannot be hardened by heat treatment.
They can be hardened by cold working. Can High Strength Fasteners be Plated. Get the latest news and offers to your inbox Get offers to your inbox. Ideal for the furniture trade, we specialise in the supply of heat seal, grip seal and zip seal bags of screws and fasteners for your application.
Fastener packing information. Looking for fixings with an unusual head diameter or thread length? Need fasteners with a non-standard finish? There are a number of confusing names and terms within the Fastener industry, so we have created a handy terminology glossary to help. We look forward to helping you. A2 Stainless Steel Fasteners A2 stainless steel fixings are made from an alloy containing a mixture of two or more metals. A4 Stainless Steel Fasteners There is no evident visual difference between A2 and A4 stainless fasteners steel as they are both polished using the same process — but there are characteristics that provide a difference.
A Stainless Steel Fasteners Stainless steel grade A is often used in surgical instruments, due to its non-reactive qualities and corrosion resistance. Search for:. Kitting and Packaging Service Ideal for the furniture trade, we specialise in the supply of heat seal, grip seal and zip seal bags of screws and fasteners for your application.
Specials and non standard fixings Looking for fixings with an unusual head diameter or thread length? Or do you have other special requirements? Custom fasteners are no problem for Fastenright!
Special fasteners information. Fastener Terminology Glossary There are a number of confusing names and terms within the Fastener industry, so we have created a handy terminology glossary to help. Read our fastener glossary. Contact Us The Fastenright specialist team is available to discuss your requirements.
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