What material is commonly used for key manufacturing?

Metal is commonly used for key manufacturing due to its durability, strength, and resistance to wear and tear. Keys, especially those used in locks, need to withstand repeated insertion and turning without becoming deformed or breaking. Metals such as brass, steel, and nickel are favored for their properties; brass, for instance, has good corrosion resistance and can be easily machined to precise shapes.

Other materials like wood, plastic, and rubber can be adequate in specific applications, such as temporary or novelty keys, but they do not offer the same level of durability and security as metal keys. Metal's ability to hold intricate designs and tolerances makes it the preferred choice for the functionality and longevity of keys used in locks and security systems.