M10 (3/8″) x 20mm Zinc Flat Washers High Tensile ASTM F436M – 373019
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High Tensile Washers are used to increase the bearing surface of a nut or fastener’s head thus spreading the clamping force over a larger area. Commonly used with high tensile bolts and are easily identifed by markings on the face of the washer. The washer also ensures a smooth base for the nut to press against
