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Washers provide a greater bearing surface under the fastener. Lock washers place tension against a nut after tightening, to help prevent the nut from loosening.
Internal Tooth Lock Washers bite into the screw head while the smooth, outside rim won't snag objects. Provide greater vibration resistance than split lock washers. Used with fasteners that have small heads. Zinc-plated steel washers are corrosion resistant in wet environments.
Rubber washers are small flat rubber rings used on fasteners and in mechanical devices. These are great for use in light sealing applications and protecting surfaces from scratches. As clamping force is applied, rubber washers are compressed to conform to irregular surfaces. Also used to prevent vibration from spreading from one part to another, reducing the noise levels and ideal as gaskets or sealants where liquids or gases are present.
Paulin S.A.E. Flat Washers have bright, smooth, flat surfaces; are highly polished and free from burrs. Use these washers to bolts and screws to prevent them from boring into the wood and weakening it. Zinc-plating provides moderate corrosion resistance. Use with fasteners of the same material.