1-8 ASTM A563 DH HVY NUT HDG .024” ASTM A563 DH HEAVY HEX NUT HDG ASME/ANSI B18.2.2 1987 IFI-7 AF 1.575 – 1.625 “ THK 0.956 – 1.012” TAPPED OVER SIZE PER ASTM A 153 CLASS C, WAXED & LUBRICATED