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Stainless Steel Hex Head Cap Screws

If the applications most prevalent concern is maintaining the fasteners material integrity due to the environment it will be in (marine, beach, humid, saline, etc) then stainless steel is the best choice. There are many grades with different strengths, common types include 304 and 18-8, 316, and others, each with multiple variations from slight material differences. For many bolts, the grade is indicated by markings around the perimeter of the bolt head. 18-8 refers to the 18% chromium and 8% nickel content in the fasteners material composition, SS304 is technically in the category of 18-8 stainless steel. However, SS316 would not be considered 18-8 because of the approximate ~2% molybdenum it contains, giving it stronger corrosion resistance than lower grades like 18-8/304. Stainless is excellent for applications in climates that have high humidity, heavy rain/snow, or nearby oceans (high concentration of salt in the air) and also where it will be exposed to rain, dew, or snow for long periods of time. Also, because the corrosive resistance properties are due to composition, a chip or crack in the bolt will not compromise its corrosive resistance unlike the plating on a grade 5/8 bolt, which would corrode through itself if chipped or cracked. The drawback of the corrosion resistance is the fastener tensile/shear strength, it is much lower than typical Grade 5/Grade 8 bolts and close to the strength of a grade 2 bolt. The only stainless steel grade range which offers similar tensile strength to Grade 5 and Grade 8 is the 400 series, however this grade is very expensive and more difficult to obtain. Another feature of stainless steel is the fact that most grades are highly if not completely nonmagnetic, which may be useful if the application requires nonmagnetic hardware such as audio applications or other devices that use magnets or electromagnets (e.g: MRI machine, NMR spectrometer, etc.). Used with a wrench or socket in threaded holes, or with a lockwasher/flatwasher and hex nut. (Minimum tensile strength depends on SS class, please call for more information)

Stainless Steel Hex Head Cap Screws

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