Item Specifications UPC 842176193984 Package Quantity 50 Drive Style External Hex Drive Size 9/16" Inch / Metric Inch Thread Size 3/8"-24 Thread Class Class 2B Coarse / Fine Fine Threads Per Inch (TPI) 24 Height .468" 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 5150-15780 SKU 305182