Item Specifications UPC 842176194066 Package Quantity 10 Drive Style External Hex Drive Size 15/16" Inch / Metric Inch Thread Size 5/8"-18 Thread Class Class 2B Coarse / Fine Fine Threads Per Inch (TPI) 18 Height .765" Material Steel Material Type Zinc Plated Steel Grade Grade 2 Finish Electro Zinc & Clear Specification 1 ASME : B18.16.6-2014 Proof Load 90,000 psi Core Hardness Rockwell C28 max Item Type Nuts Nut Type Nylon Lock Nut Product Code 5150-15820 SKU 305190