Specification Brand : POWERTEC BulletPoint1 : INCLUDES: Flange Hex Lock Nuts M12 25pcs BulletPoint2 : FUNCTION: These high quality serrated lock nuts bite into the surface that they’re tightened against, preventing any rotation or loosening, while the wide flange acts as an integrated washer providing a firm solid grip BulletPoint3 : APPLICATION: These steel lock nuts are perfect for a variety of heavy duty automotive applications, tank repairs, and machinery with severe vibration BulletPoint4 : SPECS: (item# QLN1203) Thread and Opposing Screw Size – M12 (12 mm diameter) External Hex Drive Style BulletPoint5 : Meets IFI 100/107 specifications Color : Silver DriveSystem : External Hex ExteriorFinish : Nickel Plated Steel ExternallyAssignedProductIdentifier1 : 843441101765 ExternallyAssignedProductIdentifier2 : 0843441101765 ExternallyAssignedProductIdentifier3 : 00843441101765 FinishType : Smooth Finish GpsrSafetyAttestation : 1 GradeRating : Industrial ItemName : POWERTEC QLN1203 Serrated Flange Hex Lock (M12) Nuts | Premium Carbon Steel Zinc Plated Fasteners – 25 Pack ItemPackageDimensions_Height : 16.51 centimeters ItemPackageDimensions_Length : 2.54 centimeters ItemPackageDimensions_Width : 8.89 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : flange-nuts Manufacturer : POWERTEC Material : Steel Material1 : zinc plated Material2 : steel MaximumShearStrength : 2000 N MeasurementSystem : Metric MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Alloy Steel MetalType1 : Carbon Steel MetalType2 : Alloy Steel ModelNumber : QLN1203 NumberOfItems : 1 NumberOfPieces : 25 PackageLevel : unit PartNumber : QLN1203 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.