Specification Brand : uxcell BulletPoint : DRC RIM LOCK NUTS GOLD 2/PK D58-02-103 BulletPoint1 : Thread Size: 5/16"(D); Product Name: Hex Flange Nut; Material: Carbon Steel BulletPoint2 : Weight: 114g; Package Content: 20pcs x Hex Flange Nut BulletPoint3 : Main Color: Silver Tone; Height: 7mm/0.28"(Total.Height) BulletPoint4 : Hex Size: 13mm/0.5"(Hex.Width); Flange Diameter: 17mm/0.75" BulletPoint5 : Grade: 4.8; Thread Count: 18 Color : Silver DriveSystem : External Hex ExteriorFinish : Carbon Steel ExternallyAssignedProductIdentifier : 4547836033216 ExternallyAssignedProductIdentifier1 : 602451618607 ExternallyAssignedProductIdentifier2 : 0602451618607 FinishType : Silver GpsrSafetyAttestation : 1 GradeRating : commercial ItemName : uxcell 5/16 inch x 18 Carbon Steel Serrated Hex Flange Lock Nuts 20pcs ItemPackageDimensions_Height : 9.5 centimeters ItemPackageDimensions_Length : 1.8 centimeters ItemPackageDimensions_Width : 9.2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : flange-nuts Manufacturer : uxcell Material : Steel MeasurementSystem : Inch MetalType : Carbon Steel ModelNumber : SYNCTEA052866 NumberOfItems : 1 NumberOfPieces : 50 PackageLevel : unit PartNumber : a16033100ux0399 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.