Specification Brand : Shorpioen BulletPoint1 : For use with A307 Grade A or Grade B bolts BulletPoint2 : Nuts shall be made from a carbon steel which conforms to the following chemical composition requirements Carbon: 0.58% maximum; Phosphorus: 0.13% maximum. Rockwell B68 - C32 BulletPoint3 : Rockwell B68 - C32 DriveSystem : Square ExteriorFinish : Carbon Steel FinishType : Phosphorus ItemName : 1/2-13 Heavy Square Nut Plain (Pack Qty 300) BC-50NQHP by Shorpioen ItemPackageQuantity : 300 ItemTypeKeyword : square-nuts Manufacturer : Shorpioen LLC Material : Plain MeasurementSystem : Inch MetalType : Carbon Steel ModelNumber : BC-50NQHP NumberOfItems : 300 PartNumber : BC-50NQHP 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. For use with A307 Grade A or Grade B bolts. Nuts shall be made from a carbon steel which conforms to the following chemical composition requirements Carbon: 0.58% maximum; Phosphorus: 0.13% maximum. Rockwell B68 - C32 . ProductSiteLaunchDate : 2016-11-17T16:09:08.271Z Size : 2013-01-02 SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnspscCode : 31161700