On diameters over 1 inch to 1 1/2 hardness will range from HRC 19-30

1/2 x 12 High Speed Aircraft Bit

and residential applications

3-4 A194 2H Heavy Hex Nut Plain

1/2-13 x 2 Grade 5 Hex Cap Screw Zinc Plated Domestic USA (250)

3/4-10 x 5 1/2 A307 Grade A Carriage Bolt Hot Dipped Galvanized 2-4 A307A Hex Bolts Plain Steel On diameters over 1 inchGet superior fastening with our 3 4 10 x 5 1 2 A307 Grade A Carriage Bolt. Made with hot dipped galvanized steel, it provides extra protection against corrosion. Achieve a strong and durable hold with this bolt's Grade A construction. Perfect for various projects, from construction to automotive.