7/8-9 ASTM A563 DH HVY NUT HDG .022” ASTM A563 DH HEAVY HEX NUT HDG ASME/ANSI B18.2.2 1987 IFI-7 AF 1.394 – 1.438” THK 0.833 0.885” TAPPED OVER SIZE PER ASTM A 153 CLASS C, WAXED & LUBRICATED