There are many causes of broken keys. But most people can establish the cause to be the extreme force by the users. Still, not all keys can break due to a lot of force by the users. In the end, all keys begin to wear out. However, depending on your key type, your key might be more susceptible to breaking than others.
In the case your key has many deep cuts on its surface, then it is more prone to breaking than keys that possess fewer deep cuts. These grooves and cuts constitute weak points along the key. When the key is used for a long time extensively, these grooves or cuts will either break or crack, cause damage to your key.
In other instances, the key’s material plays a major role in the key’s resistance to damage and the key’s lifespan. This is normally so with temporary keys made of materials such as aluminum. These keys are susceptible to damage along the grooves as compared to permanent keys. Other times, the key could be made of a robust material but the keys face a great amount of pressure daily which leads to cosmetic damage and decline in their physical strength.
Moreover, the key could break as a result of internal wear and tear of the lock mechanism. Despite the cause of the broken key, it is advisable to contact a professional locksmith to handle the broken key extraction before causing any more harm to your lock.