There are various types of stainless steel screws, which fall into different categories based on their chemical properties. The type that is most commonly used for security screws is A2, also known as type of 304 stainless steel screws. And A4 stainless steel, or type 316, is also used for security fittings. Generally products in this material are manufactured to order. If you are still not familiar with these two screws, let me show you a detailed explanation.
The 304 Stainless Steel Screws
The 304 stainless steel screws are made up of approximately 18% chromium and 8% nickel (18-8). These screws, which also include the 302, 302HQ, 303 and 305, are characterized by multiple variables and grades with a close chemical composition. The term “18-8” is used interchangeably and is one characteristic used to define this series of screws.
There is very little overall difference in corrosion resistance among these 18-8 series types. However, feature slight differences protrude when it comes to their chemical composition, making some grades more resistant than others against particular chemicals or atmospheres. The 304 Stainless Steel Screws has superior corrosion resistance and is generally non-magnetic.
The 316 Stainless Steel Screws
The 316 stainless steel screws contain slightly more nickel than the 304 screws, as well as 2-3% molybdenum. This gives these screws much better resistance to corrosion than the 304 stainless steel screws. These screws are ideal of use where there is exposure to chemicals and other types of corrosive products such as chloride which tends to cause pitting.
These screws offers superior performance when products are to be exposed to sea water and is resistant to corrosion in sulphuric acid compounds. They are thus best used in projects where there is likely to be exposure to direct salt spray and a variety of harsh chemicals.
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