Specification Brand : Shorpioen 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 FinishType : Phosphorus ItemName : 5/16-18 Regular Square Nut Hot Dipped Galvanized (Pack Qty 1,000) BC-31NQRG by Shorpioen ItemPackageQuantity : 1000 ItemTypeKeyword : square-nuts Manufacturer : Shorpioen LLC Material : Galvanized MeasurementSystem : Inch MetalType : Carbon Steel ModelNumber : BC-31NQRG NumberOfItems : 1000 PartNumber : BC-31NQRG 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. ProductSiteLaunchDate : 2017-01-04T15:00:30.436Z Size : 2018-05-16 SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnspscCode : 31161700