3/4-10 ASTM A563 DH HVY NUT HDG .020” ASTM A563 DH HEAVY HEX NUT HDG ASME/ANSI B18.2.2 1987 IFI-7 AF 1.212-1.250” TH 0.710-0.758” TAPPED OVER SIZE PER ASTM A 153 CLASS C, WAXED & LUBRICATED