***What Is a Commercial Grade Lock?**** A-Access Lock & Key company is a professional Charlotte locksmith agency serving the Charlotte, NC area. Door locks are made in varying grades. This means that each has a level of security and reliability. The grade of door locks is determined by its durability, level of strength and the cost. These features tell you exactly what to expect with each grade. Therefore, your purchase should be tailored to your personal needs and budget. If a door lock is at grade one, this means it can endure about a million or more open and closes. The second and third level locks can open and close up to 800,000 times. The grade one lock can withstand up to 10 hits to the knobs: each 75 foot-pounds. Degree one bolt is projected as one inch away from the door. The latch of the one and three degrees is projected as 1.2 inches. For the 75 foot-pounds, the shockproof doorknob grade two lock can withstand five hits, and grade three locks can withstand two hits. ~ Teddy Poulos, Chief Locksmith, A-Access Lock & Key. Choose A-Access Lock & Key. We are the key to your security. #CharlotteLocksmith #AAccessLock&Key