Specification Brand : uxcell BulletPoint1 : Fastener Type: Hex Serrated Flange Nut BulletPoint2 : Thread Diameter: M8; Thread Pitch: 1.25mm; Flange Diameter(A): 16mm/0.63" BulletPoint3 : Width Across Flat Size (B) : 13mm;Nut Height (M) : 7mm 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 : Black CompatibleDevices : Solar DriveSystem : External Hex ExteriorFinish : Zinc,Carbon Steel ExternallyAssignedProductIdentifier : 6043577687643 ExternallyAssignedProductIdentifier1 : 0752811453550 ExternallyAssignedProductIdentifier2 : 752811453550 FinishType : black zinc GpsrSafetyAttestation : 1 GradeRating : Class 10.9 ItemDisplayDimensions_Length : 6.25 inches ItemName : uxcell M8 Serrated Flange Hex Lock Nuts, Carbon Steel 100 Pcs ItemPackageDimensions_Height : 13.3 centimeters ItemPackageDimensions_Length : 2.7 centimeters ItemPackageDimensions_Width : 8.4 centimeters ItemPackageQuantity : 50 ItemTypeKeyword : flange-nuts Manufacturer : uxcell Material : Steel Material1 : nickel plated Material2 : copper MeasurementSystem : Inch MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Carbon Steel MetalType1 : Nickel MetalType2 : Copper ModelName : lifepo4 ModelNumber : a18091200ux0108 NumberOfItems : 50 NumberOfPieces : 100 PartNumber : a18091200ux0108 PinType : Aligning 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.