Specification Brand : Korpek.com BulletPoint1 : Designed for use with square bolts BulletPoint2 : Nuts shall be made from a low carbon steel which conforms to the following chemical composition requirements--Carbon: 0.55% maximum; Phosphorus: 0.12% maximum; Sulfur: 0.23% maximum. BulletPoint3 : Rockwell B68 - C32 DriveSystem : Square ExteriorFinish : Carbon Steel,Zinc FinishType : Phosphorus ItemName : 5/8-11 Regular Square Nut Zinc (Pack Qty 200) BC-62NQR by Korpek ItemPackageQuantity : 200 ItemTypeKeyword : square-nuts Manufacturer : Korpek LLC Material : Zinc MeasurementSystem : Inch MetalType : Carbon Steel ModelNumber : BC-62NQR NumberOfItems : 200 PartNumber : BC-62NQR ProductDescription : PICTURES ARE REPRESENTATIVE OF ITEM, BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions, finish, head markings, thread length, stamping shape or forging shape, etc., may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape, which can vary from lot to lot. Designed for use with square bolts. Nuts shall be made from a low carbon steel which conforms to the following chemical composition requirements--Carbon: 0.55% maximum; Phosphorus: 0.12% maximum; Sulfur: 0.23% maximum. . Rockwell B68 - C32. Machine Pack Count - Margin error of +/- 5% ProductSiteLaunchDate : 2021-02-08T18:56:53.693Z Size : 2011-05-08 SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnspscCode : 31161700