5/8-11 GR2 HEX NUT HDG .020” SAE J995 GRADE 2 HEX NUT HDG ASME/ANSI B18.2.2 1987 IFI-7 AF 0.922-0.938” TH 0.535-0.559” – 25/BOX Tapped Over Size per ASTM A 153 class C