The American National Standards Institute (ANSI) established an industry grading system for locks based on their level of security and ability to withstand common types of attacks, like lock picking and door strikes. Testing teams close and latch the hardware hundreds of thousands of times to ensure quality doesn’t lapse and each door lock is also tested for strength against forced entry. ANSI Grade 3 door hardware is considered industry standard for residential locks, but are the least secure, making them the best choice for securing interior doors within your home.