Specification Brand : Korpek.com BulletPoint1 : Hex Machine Screw Nut: Designed to be used specifically with machine screws. Stainless nuts are used with stainless machine screws where parts are subject to corrosive conditions. Square Machine Screw Nut: Offers a greater bearing surface for wrenching BulletPoint2 : Steel: Any low carbon steel. BulletPoint3 : Stainless: 18-8 stainless steel DriveSystem : Square ExteriorFinish : Stainless Steel,Zinc,Steel FinishType : Phosphorus ItemName : 5/16-18 Square Machine Screw Nut Zinc (Pack Qty 2,000) BC-31NQ by Korpek ItemPackageQuantity : 2000 ItemTypeKeyword : square-nuts Manufacturer : Korpek LLC Material : Zinc MeasurementSystem : Inch MetalType : Carbon Steel MetalType1 : Stainless Steel MetalType2 : Carbon Steel MetalType3 : Alloy Steel ModelNumber : BC-31NQ NumberOfItems : 2000 PartNumber : BC-31NQ 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. Hex Machine Screw Nut: Designed to be used specifically with machine screws. Stainless nuts are used with stainless machine screws where parts are subject to corrosive conditions. Square Machine Screw Nut: Offers a greater bearing surface for wrenching. Steel: Any low carbon steel.. Stainless: 18-8 stainless steel. Machine Pack Count - Margin error of +/- 5% ProductSiteLaunchDate : 2021-02-08T18:57:03.950Z Size : 2018-05-16 SupplierDeclaredDgHzRegulation1 : not_applicable SupplierDeclaredDgHzRegulation2 : not_applicable SupplierDeclaredDgHzRegulation3 : not_applicable SupplierDeclaredDgHzRegulation4 : not_applicable SupplierDeclaredDgHzRegulation5 : not_applicable UnspscCode : 31160000