Stainless Steel Fasteners
18/8 stainless steel is nominally 18% chromium and 8% nickel, with the remainder being mainly iron; it does however also contain other elements, but at very low levels.18-8 Stainless Steel is also known as type 302 or 304 grade stainless steel. This grade of stainless is generally regarded as one of the most common stainless steels as it is widely available. Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Stainless steel is highly corrosion resistant for the price and because the anti-corrosive properties are inherent to the metal, it will not lose this resistance if scratched during installation or use. Stainless steel does not stain, corrode, or rust as easily as ordinary steel, but it is not stain-proof. It is also called corrosion-resistant steel or CRES when the alloy type and grade are not detailed, particularly in the aviation industry. Stainless steel fasteners are used where both the properties of steel and resistance to corrosion are required.
It is a common misconception that stainless steel is stronger than regular steel. In fact, due to the low carbon content, stainless steel cannot be hardened. Therefore, when compared with regular steel, it is slightly stronger than un-hardened (grade 2) steel bolts and other fasteners, but significantly weaker than hardened steel fasteners. Stainless steel fasteners are also much less magnetic than regular steel fasteners though some grades will be slightly magnetic.
Galling of Stainless Steel Fasteners... Important Information, Please Read: Galling Document