5/8-18 Hex Jam Nut Zinc Plated

5/8-18 Finished Hex Jam Nut Zinc Plated . Specification Requirements:
• Material: Grade A per ASTM A563
• Hardness: 68 HRB minimum
• Thread Dimensions: ASME B1.1 UNC, UNF & UN8 Class 2B.
• Finish: Fe/Zn 3AT Per ASTM F1941