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In addition to distributing the load of a fastener, DIN 126 washers also help to protect the surface of the material being fastened. For example, when fastening two metal pieces together, the washer acts as a barrier between the fastener and the surface of the material. This helps to prevent corrosion and rust from forming over time. Without the use of washers, the metal pieces could come into direct contact with each other, leading to damage and potential failure of the fastening system
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din 126 washer.

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m14 coach bolts