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Frequently Asked Questions (FAQs)
Access control: The means of influencing and regulating the flow of persons through a door (entry and/or exit).
ADA: Americans With Disabilities Act - For more information on ADA Accessibility Guidelines contact the US Access Board or visit their website at www.access-board.gov.
Backset: The backset is the distance between the edge of the door to the center of the main hole. The main hole is usually a round 2 1/8" diameter that the body of the lock fits through. The distance is usually 2 3/8" or 2 3/4". Today, most commercial and industrial doors are set for 2 3/4". The trend has been for more private homes set this way also. These are the two most common backsets. When measuring the backset make sure to do it carefully. The difference is small and it's easy to make a mistake especially if your measuring with the lock still on the door. You may have noticed that on cheaper lock hardware the backset often is variable. But this is not the case with the better quality heavy duty locksets.
Cylinder: A housing that contains a tumbler mechanism and a key-way plug that can be turned only by the correct key. It includes a cam or spindle to transmit rotary action to a lock or latch mechanism. For security and keying versatility, authorities generally specify a pin-tumbler cylinder of no fewer than five pins. The two types of cylinders, the mortise cylinder (round, threaded housing) and the bored lock cylinder (sometimes called a cylinder insert), which both provide the same functional value of security and convenience and are often included in the same keying system.
Deadbolt: A bolt operated manually and not actuated by springs. When locked, the bolt cannot be forced back. It's dead until unlocked. A deadbolt is operated (projected and retracted) by a key cylinder or lever handle. Deadlatch: A latch in which the latchbolt is positively held in the projected position by an auxiliary mechanism. The latch now acts as a bolt.
Digital Lock: Usualy refers to a stand alone lock that has a built in keypad and therefore uses digits such as a telephone keypad to unlock the lock.
Double pole double throw switch: (DPDT): A term used to describe a switch or relay output contact form (2 form C) in which two separate switches are operating simultaneously, each with a normally open and normally closed contact and a common connection. This form is used to make and break two separate circuits.
Electric Strike or striker: An electric door locking device (usually solenoid-operated) that will unlock the door when electrical power is applied to it. A fail-safe configuration will operate in the reverse condition (i.e., normally locked when power is applied and unlocked when power is interrupted).
Entrance Function: Outside knob/lever locked or unlocked by turning or pushing inside button. Key unlocks knob/lever from outside. Inside knob/lever always unlocked.
Fail-safe lock: An electric lock or strike that automatically unlocks with any power interruption. When power is turned off no locking will occur. All magnetic type locks are always Fail-safe.
Fail-secure lock: An electric lock or strike that requires power to unlock. When power is turned off lock will still be locked. Fail-safe is much more common.
Form C contact: A switch that contains three terminals normally open, common, and normally closed.
Grade one hardware: locks that are classified grade one generally are made for commercial installations and can be used hundreds of times each day and still work for many years. Even though they are commercial grade, many are used on homes where people want the strongest hardware possible.
Grade two hardware: locks that are classified grade two are made for residential use. Grade two hardware should not be used in commercial installations.
Grade three hardware: this is the lowest quality type of hardware usually sold in most hardware stores. We strongly suggest you never use this.
Ground: A conducting connection between an electrical circuit and the earth or other large conducting body to serve as an electrical ground, thus making a complete electrical circuit.
Handing: On some products it's important to know the handing of the lock. Here is an easy way to figure this out: stand on the side of the door that you can see the hinges. If the lock is on the right side of the door (hinges on the left) you'll need a right hand lock, if the lock is on the left side of the door (hinges on the right) you'll need a left hand lock. Also, next to the pictures of most lever locks we show you a left or right hand lock as a guide. See handing diagram
Hard-wired: as opposed to wireless - Such as an intercom that is wired from station to station as opposed to a wireless or radio frequency intercom.
Keyed Alike or (KA): usualy refers to more than one lock that is made to function with the same key.
Keyed Different or (KD): usualy refers to locks with different keys. The opposite of kA
Master Keyed or (MK): When all lock can be locked or unlocked with one key. Similar to keyed alike but in a master key system, all locks may be keyed differently but the master key will override the regular user key. In this way one key can open all locks and the locks may be all keyed differently. Useful for office buildings.
Open circuit or normally opened: (1) An electrical circuit in which current does not flow until permitted by the closing of a switch or a switch-type electronic component. (2) A circuit or switch in which the contacts are open during normal operation
Panic-proof locks: Locks that provide immediate exit from the inside at all times.
Passage Function: Outside knob/lever always open. This function is used for doors where no locking is required. The knobs or levers freely operate the latch. Passage sets are commonly used on interior doors, and sometimes on an exterior door in conjunction with a separate deadbolt.
Storeroom Function: Outside knob/lever always locked. Unlocked by key or on board keypad only. Inside knob/lever always free to turn and open or unlock. This is the function you'll want to have the lock, lock automatically every time the door closes. This is the norm with access control. (back to specifications on Digital Mechanical Locksets)
Left Hand: or (LH) From the outside, if the hinges are on the left and the door opens in, it's a left hand door.
Right Hand: or (RH) From the outside, if the hinges are on the right and the door opens in, it's a right hand door.
Left Hand Reverse: or (LHR) From the outside, if the hinges are on the left and the door opens out, it's a left hand door.
Right Hand Reverse: or (RHR) From the outside, if the hinges are on the right and the door opens out, it's a right hand door.
160 Prep: 2-3/8" cross bore hole, 1" edge hole with 1" x 2-1/4" latch mortise
161 Prep: 2-3/4" cross bore hole, 1" edge hole with 1-1/8" x 2-1/4" latch mortise.
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