https://www.aspenfasteners.com/7-8-9-hex-heavy-nuts-grade-c-steel-zinc-astm-a563/
Heavy Hex Nuts 7/8"-9 Hex Drive Steel Zinc Grade C NU156
Buy Online from Aspen Fasteners | Free Shipping | 7/8"-9 Hex Heavy Nuts, Grade C Steel, Zinc, ASTM A563
heavy hex nuts