![]() ![]() It offers the highest strength compared to other metals and elements, but is the least corrosion resistant. The most common material used in fasteners, this material is predominantly iron mixed with carbon. There are over 150 grades of this material with the 304 and 316 series being the most common. The chromium forms a protective layer when exposed to oxygen, keeping the steel underneath from corroding. This material is known for its corrosion resistance and has varying strengths depending on the amount of chromium and nickel alloy. MaterialĪn iron based material with a minimum of 10.5% chromium. ![]() The corrosion resistance and ease of fabrication are why this grade is used in food industry machines, appliances, architectural trim and aquatic fasteners. The ASTM denotation for very similar grade is 304. It is comparable in strength to grade 2 materials, yet slightly weaker and easy to weld. A2Ī type of the most common stainless steel grade. It has higher corrosion resistance than the 400 series stainless steels and it is non-magnetic. All 300 series stainless steel share the ratio of chromium to nickel with varying other elements improving different properties. It's strength has a range from the middle to low end of the grade scale. 18-8Ī general designation for the most common and popular stainless steel, (300 Series) referring to the 18% chromium and 8% nickel. The DIN/ISO denotation for a very similar grade is A4-70. It is used in more severe corrosive environments than 304 stainless steel, as such it is used in more industrial settings, like process chemicals, textiles, bleaches, salt water and rubber. It is on the low middle end of the grade scale. The second most common stainless steel grade, this material is stronger than grade 2, slightly weaker than grade 5,or generally as strong as medium to low carbon steel. This finish should not be used in marine or high salt spray environments. Slightly less corrosion resistant than yellow zinc, it is a versatile finish that is best used indoors. It is a popular finish because of its protection, value, and ease of coating. The zinc protects the steel from corrosion and the chromate layer protects the zinc from degrading. It is an electroplated zinc layer covered with a chromate post-treatment. This finish, also know as zinc plating, zinc chromate or dichromate provides good corrosion resistance and is the standard for many hardware fasteners. This most basic finish can be used when protection is not an issue or indoors. This finish is susceptible to rusting and corrosion in exterior environments. Often the surface has been oiled which improves lubricity. Nothing has been done to this bare metal surface to improve appearance or corrosion resistance, which is very low if the material is steel. This finish looks great when trying to achieve a stylish or "high-tech" look on exposed fastener heads. This coating reduces galling, improves lubrication of mating parts and reduces glare. Black OxideĪn extremely thin attractive finish with minimal corrosion resistance. This highly polished Holo-Krome® finish claims to resist corrosion and rust, while also acting as a lubricant in the driving process.
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