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Cyful M8 Serrated Hex Flange Nuts Locknuts Zinc Plated-50PCS: Industrial & Scientific. Buy Cyful M8 Serrated Hex Flange Nuts Locknuts Zinc Plated-50PCS: Flange Nuts - ✓ FREE DELIVERY possible on eligible purchases. Self-locking serrated flange digs into the material being fastened to help prevent loosening. 。 A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer. 。 Height : 7mm / 0.28" ; Flange Diameter: 15mm / 0.59" ; Width Measured From Flat to Flat: 13.5mm / 0.53" 。 Because of the serrations they cannot be used with a washer or on surfaces that cannot be scratched. The serrations help in avoiding vibration of nut and increase the holding power of nut. 。 This serves to distribute the pressure of the nut over the part being secured, reducing the chance of damage to the part and making it less likely to loosen as a result of an uneven fastening surface. 。 Features:。.The flange may be serrated to provide a locking action.。.The serrations are angled such that they keep the nut from rotating in the direction that would loosen the nut.。 。 Package included:50 x flange nut 。 。 。