![]() Grade 8 bolts have been hardened more than grade 5 bolts. Grade F nuts are used with Grade 5 bolts. Grade F is roughly equivalent to Grade 5. Grade 5 bolts have 3 evenly spaced radial lines on the head. The most common bolts found in automotive applications. Grade 5 bolts are hardened to increase strength and are ![]() Most common grade of steel fastener and is the least expensive.Įxcept a possible manufacturer's mark, Grade 2 bolts have no head marking. Grade 2 is a standard hardware grade steel. Most stainless steel fasteners are much less magnetic than regular steel fasteners though some grades will be slightly magnetic. Unless great care is taken, stainless fasteners are susceptible to seizing upĭuring installation, a phenomenon known as galling. Un-hardened (grade 2) steel but significantly weaker than hardened steel fasteners. Therefore, when compared to regular steel, the stainless alloys used in bolts are slightly stronger than an In fact, due to their low carbon content, many stainless steel alloys cannot be hardened through heat treatment. It is a common misconception that stainless steel is stronger than regular steel. Because the anti-corrosive properties are inherent to the metal, it will not lose this resistance if scratched during installation or use. Stainless steel is highly corrosion resistant for the price. ![]() Stainless steel is an alloy of low carbon steel and chromium for enhanced corrosion characteristics. Salt water, galvanic corrosion must also be considered if changingįastener materials. Also some equipment isĭesigned so that the bolts will fail before more expensive When replacing fasteners, it is generally best to match what Of coatings or platings to enhance the corrosion resistanceįastener material can be important when choosing a fastenerĭue to differences between materials in strength, brittleness,Ĭorrosion resistance, galvanic corrosion properties and, of In addition, some materials are available with a variety Many materials are further separated into different grades to describe specific alloy mixtures, hardening processes,Įtc. Fasteners are manufactured in a wide range of materialsįrom common steel to titanium, plastic and other exotic materials.
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