What is a common material used for cutting tools?

High-Speed Steel (HSS) is a common material used for cutting tools due to its excellent hardness and durability, especially at high temperatures. It retains its hardness even when heated, which allows it to maintain cutting efficiency during machining operations. HSS is particularly valuable in applications requiring resistance to wear and the ability to cut through tough materials.

This material can also be easily shaped and sharpened, making it a versatile choice for various types of cutting tools, such as drills, taps, and milling cutters. In comparison, materials like aluminum and copper are not suitable for cutting tools because they are too soft and do not maintain the required sharp edges needed for effective cutting over time. Plastic, on the other hand, lacks the necessary hardness and rigidity to withstand the forces encountered during machining processes.