Specification Brand : uxcell BulletPoint1 : Fastener Type: Hex Serrated Flange Nut BulletPoint2 : Thread Diameter: 1/4"; Thread Size: 20 threads per inch; Flange Diameter(A): 15mm/0.59" BulletPoint3 : Width Across Flat Size (B) : 11mm/0.43"; Nut Height (M) : 15mm/0.59" 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 GradeRating : industrial ItemName : uxcell 1/4"-20 Serrated Flange Hex Lock Nuts, Carbon Steel Zinc Plated 50pcs ItemPackageDimensions_Height : 14.2 centimeters ItemPackageDimensions_Length : 1.8 centimeters ItemPackageDimensions_Width : 9.1 centimeters ItemTypeKeyword : flange-nuts Manufacturer : uxcell Material : Steel MaximumShearStrength : 2000 N MetalType : Carbon Steel ModelNumber : a21090700ux0386 NumberOfPieces : 50 PartNumber : a21090700ux0386 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 breaking 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 the vibration of the nut and increase the holding power of the nut. Specification: Product Name: Hex Flange Nut Material: Carbon Steel Finish: Zinc Plated Main Color: Silver Tone Thread Size: 1/4" Height: 5.8mm/0.23" Hex Width: 11mm/0.43" Flange Diameter: 15mm/0.59" Thread Count (inch): 20 Package Content: 50pcs x Hex Flange Nut