Gray cast iron machines faster with less wear on cutting tools than most types of steel. It's often fabricated into gears, pulleys, and bushings.

Easier to machine without cracking than other impact-resistant ductile cast iron bars, these cast iron bars contain a high amount of ferrite. Use them to make cylinder and die blocks, rotary tables, and rail spacers.

Ductile cast iron is strong, resilient, and able to handle repeated stress without breaking.