Specification Brand : AMZ Clips And Fasteners BulletPoint1 : Size: 9/16 inch-12 BulletPoint2 : Features an internal nylon ring that grips bolt threads better than a standard finished nut BulletPoint3 : Great for use in applications where the bolt may be subject to vibration BulletPoint4 : Can also be used as a secondary nut to help lock the main nut in place BulletPoint5 : The side with the nylon insert should face towards the tip of the bolt, not towards the surface being fastened BulletPoint6 : Thread Type: Coarse, Thread Class: UNC-2B BulletPoint7 : Specification(s) Met: ASME B18.6.6 and ASME B1.1 Color : Copper DriveSystem : External Hex DriveSystem1 : External Hex DriveSystem2 : JIS ExteriorFinish : Copper ExternallyAssignedProductIdentifier1 : 888742004292 ExternallyAssignedProductIdentifier2 : 0888742004292 ExternallyAssignedProductIdentifier3 : 00049793166050 FinishType : Copper Plated FinishType1 : yellow FinishType2 : blue FinishType3 : red GpsrSafetyAttestation : 1 GradeRating : Grade 2 ItemName : 25 M8-1.25 Flange Exhaust LockNut Copper Plated 12mm Hex ItemPackageDimensions_Height : 7.366 centimeters ItemPackageDimensions_Length : 4.064 centimeters ItemPackageDimensions_Width : 4.572 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hardware-locknuts Manufacturer : AMZ Clips And Fasteners Material : Steel Material1 : Copper Material2 : Steel MaximumShearStrength : [EST] 230 MPa MeasurementSystem : Metric MetalType : Alloy Steel MetalType1 : Alloy Steel MetalType2 : Copper ModelNumber : 10520638 NumberOfItems : 25 NumberOfPieces : 25 PartNumber : 10520638 ProductDescription : Metric JIS Exhaust Flange Lock Nut Copper Plated Steel Size: M8-1.25 Height: 8mm Hex Size: 12mm Flange Diameter: 17.5mm 25 Per Package