Specification Brand : uxcell BulletPoint1 : Fastener Type: Hex Serrated Flange Nut BulletPoint2 : Thread Diameter: M6; Thread Pitch: 1mm; Flange Diameter(A): 13mm/0.51" BulletPoint3 : Width Across Flat Size (B) : 10mm;Nut Height (M) : 6mm BulletPoint4 : Constructed from carbon steel, zinc plated finish, good rust resistance and durable to use. BulletPoint5 : Self-locking serrated flange digs into the material being fastened to help prevent loosening. Color : Silver DriveSystem : External Hex ExteriorFinish : Zinc,Carbon Steel FinishType : Zinc GpsrSafetyAttestation : 1 GradeRating : industrial ItemName : uxcell M6 Serrated Flange Hex Lock Nuts, Carbon Steel 20 Pcs ItemPackageDimensions_Height : 11.557 centimeters ItemPackageDimensions_Length : 1.27 centimeters ItemPackageDimensions_Width : 10.033 centimeters ItemTypeKeyword : flange-nuts Manufacturer : uxcell Material : Steel MaximumShearStrength : 2000 N MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Carbon Steel ModelNumber : a18091200ux0113 NumberOfPieces : 50 PartNumber : a18091200ux0113 ProductDescription : A flange nut is a nut that has a wide flange at one end that acts as an integrated, non-spinning washer. 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. 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. 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.