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DIN 6331 hexagon nuts are used for applications where frequent tightening and untightening is required, the flange of the nut eliminates the need for washers.

J.W. Winco DIN 6331 Hexagon Nuts, Steel, with Flange, Blackened, M30, 1-3/4&quot;H

din-6331-hexagon-nuts-steel-with-flange-blackened-m30-1-3-4-h

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