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High Alloy Helical Spring Lock Washers, also known as Grade 8, are made from Alloy Steel. They are designed for use with Grade 5 and Grade 8 Bolts. Lock Washers are a hardened, coil shaped, split circular washer. They are primarily used to apply greater bolt tension to the unit for which they are applied. They resist loosening caused by vibration and provide a uniform load distribution.