Specification Brand : uxcell BulletPoint1 : Fastener Type: Hex Serrated Flange Nut BulletPoint2 : Thread Diameter: M12; Thread Pitch: 1.75mm; Flange Diameter(A): 26mm/1.02" BulletPoint3 : Width Across Flat Size (B) : 18mm;Nut Height (M) : 11.8mm BulletPoint4 : Made of stainless steel 201, wear-resisting and durable to use. BulletPoint5 : Self-locking serrated flange digs into the material being fastened to help prevent loosening. Color : Clear DriveSystem : External Hex ExteriorFinish : Stainless Steel ExternallyAssignedProductIdentifier1 : 708478807748 ExternallyAssignedProductIdentifier2 : 0708478807748 FinishType : silver GpsrSafetyAttestation : 1 GradeRating : Class 10 ItemDisplayDimensions_Length : 6.25 inches ItemName : uxcell M12 Serrated Flange Hex Lock Nuts, 201 Stainless Steel, 5 Pcs ItemPackageDimensions_Height : 9.6012 centimeters ItemPackageDimensions_Length : 0.9906 centimeters ItemPackageDimensions_Width : 7.5946 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : flange-nuts Manufacturer : uxcell Material : Stainless Steel MeasurementSystem : Metric MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Stainless Steel ModelNumber : a18092200ux0067 NumberOfItems : 1 NumberOfPieces : 1 PartNumber : a18092200ux0067 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.