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The outer diameter of DIN 20921 washers is the measurement across the widest part of the washer. This dimension is important for determining the size of the washer and ensuring a proper fit with the fastener and the material being fastened. The inner diameter of DIN 20921 washers is the measurement across the center hole of the washer. This dimension is important for ensuring that the washer fits securely around the fastener without interfering with the threading.

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ring anchor bolt