5 fastener materials
Learn about 5 popular fastener materials
Grade 2: This is the standard steel grade for hardware. Grade 2 bolts may bear manufacturer's markings.
Grade 5: Also known as Grade F, for automotive applications. Bolts made of grade 5 have radially lined heads.
Alloy Steel: Alloy steel bolts are heat treated for strength. They are distinguished by a grey-black finish.
Grade 8: These bolts are harder than Grade 5 and are used in demanding applications such as automotive suspension and high stress environments.
18-8 Stainless Steel: This is a special stainless steel that contains 8 percent nickel and 18 percent chromium. 18-8 stainless steel is used to produce hardware for industrial applications as well as marine fasteners.
Stainless Steel 316: This is a corrosion resistant grade of stainless steel ideal for medical, marine and seawater applications.
Stainless Steel 410: This is a less corrosive magnetic stainless steel material that is harder than the 18-8 variety.