Item Specifications UPC 842176194042 Package Quantity 10 Drive Style External Hex Drive Size 7/8" Inch / Metric Inch Thread Size 9/16"-18 Thread Class Class 2B Coarse / Fine Fine Threads Per Inch (TPI) 18 Height .656" 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 5150-15810 SKU 305188