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There are Basically 3 Qualities of Locks

Grade 1  Grade 2  and  Grade 3

Grade 1

             These locks are the heaviest duty. They are often found in commercial establishments that get a lot of usage. They may be Mortise Locks, Deadbolts, Doorknobs or Lever sets. Since the initiation of the Americans with Disabilities Act (ADA), most commercial or industrial locations now use lever sets exclusively (or should). These locks, being the most heavily tested and durable, are also the most expensive.

• Mortise Lock - a lock designed to fit into the edge of the door.

• Deadbolt - a bolt that requires deliberate action to extend, and resists end pressure in the unlocking direction when fully extended. Also called an auxillary lock.

• Doorknob - a turning device used to open or close a door.

• Leverset - a lever used with a press down action to open or close a door.

Grade 2

Grade 2 locks are generally heavy duty residential, or light duty commercial locks. Knobs, levers, and deadbolts are also available in Grade 2 quality. They are in a mid-price range, depending on the manufacturer.

Grade 3

Because of their price, Grade 3 locks are the most common locks found in residential settings. They are usually easy to install and are geared to the do-it-yourselfer.

There are different functions available.

The most common are: Passage – no lock, just keeps door closed

• Privacy -Temporary locking without a key.  Commonly used on bedrooms or bathrooms

• Entry - Lock with a key outside, turn knob inside

• Classroom - key lock outside, no turn inside. Lock may be left open with a key (passage mode), or locked with a key.

• Storeroom - Locked all the time, key temporarily unlocks door. Door is locked when the key is removed.

Another feature to think about in the selection of a lock is Key Restriction.  This is the ability to make it difficult for unauthorized persons to make duplicates of your key.

Even in this area, there are many choices.

Level 1 is a National keyway, which is available to most lock distributors. It is a keyway that is not commonly found at mass retailers.

Level 2 is a Dealer Based Keyway. Usually dealers will buy a specific keyway (which may be shared by other dealers). Customers must sign a registration card with authorized persons designated to get duplicate keys or upon purchasing the restricted keyway system are given a card which must be presented at the purchase of additional keys. Only specific dealers have access to the keyblanks needed to make these keys.

Level 3 is a Distributor or Manufacturer Keyway. Dealers do not have access to these keyblanks and must order cut keys from the Manufacturer or Distributor.

Key restriction is not available in Grade 3 locks.