Specification Brand : Fastenere BulletPoint1 : Nominal Washer Size 5/16" (0.312") BulletPoint2 : Inside Diameter Max 0.322" BulletPoint3 : Outside Diameter Max 0.610" BulletPoint4 : Thickness Max 0.034" BulletPoint5 : Type 410 Stainless Steel is the general purpose corrosion and heat resisting chromium stainless steel. It is hardened by thermal treatment to a wide range of mechanical properties. This grade is always Magnetic. BulletPoint6 : These stainless steel internal toothed lock washers feature a 1/2" screw size BulletPoint7 : 25 pieces per retail package ExteriorFinish : Plain ExternallyAssignedProductIdentifier1 : 842176142890 ExternallyAssignedProductIdentifier2 : 0842176142890 ExternallyAssignedProductIdentifier3 : 5056133342543 GpsrSafetyAttestation : 1 ItemName : 5/16" External Tooth Lock Washers, Stainless Steel 410, Plain Finish, Quantity 100 by Fastenere ItemPackageDimensions_Height : 6 inches ItemPackageDimensions_Length : 3 inches ItemPackageDimensions_Width : 1 inches ItemPackageQuantity : 100 ItemTypeKeyword : tooth-lock-washers Manufacturer : Fastenere Material : Stainless Steel MetalType : Stainless Steel ModelNumber : 43797 NumberOfItems : 100 NumberOfPieces : 100 PartNumber : 3SWLX905 ProductDescription : External Tooth Lock Washers are a hardened curcular washer that have twisted prongs called "teeth" which extend out from the outer edge of the washers. These lock washers offer the greatest locking efficiency since the teeth are on the largest radius and provide greater torsional resistance. External tooth lock washers are the most preferable of all types of tooth style lock washers. ProductSiteLaunchDate : 2016-10-21T19:03:31.021Z Size : 5/16" (100 Pack) Style : Internal Tooth UnitCount : 1 UnspscCode : 31161500 WasherType : External Tooth Lock