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10.9 bolts are a specific grade of metric hex bolts that are characterized by their high tensile strength and resistance to shear forces. The 10.9 designation indicates the bolt's tensile strength, with the first number representing the ultimate tensile strength in hundreds of megapascals and the second number representing the yield strength as a percentage of the ultimate tensile strength. 10.9 bolts are commonly used in applications where high strength and reliability are essential, such as in structural connections, heavy machinery, and automotive components.
3. Vibration Resistance In applications where vibration is prevalent, flat washers can enhance the integrity of the joint by providing an added layer of friction. This helps prevent bolts from loosening over time.