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• A basic metal or plain also known as a ring washer, often used to spread the load of a screwed fastening.
• This may also be used in applications where the hole is of a large diameter as opposed to the fixing nut. It is manufactured with serrations that extend radially inward or outward.
• These serrations bite into the bearing surface. The star washer is more effective when used with a soft substrate like aluminium or plastic.
• In fact, it tends to work effectively as a lock washer because it can resist rotation in comparison to a plain washer used on a hard surface.

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