The door backset is the distance from the edge of the door to the center of the 2-1/8-inch bore hole for the door knob, lever or deadbolt. In the United States, there are two common backsets for residential door locks: 2-3/8 inches. 2-3/4 inches.
The backset is the horizontal distance from the edge of a door to the centre of a lockset; thus, the distance a lockset is 'set back' from the edge of a door is called its backset. It's usually 1 inches or 2 inches (or 44mm and 57mm).
Lock Bore The diameter of the hole for the lock body. The standard bore is 2-1/8”. Many older doors had bores that were been smaller. Most of the current locks require the standard 2-1/8” bore.
The backset is the distance from the edge of the door to the center of the bore hole. There are two common backsets for residential door locks: 2-3/8″ and 2-3/4″.
Most deadbolts need a hole 2-1/8-inches in diameter for the body of the lock to fit into the door. The bolt on a typical deadbolt requires a 1-inch hole in the edge of the door.
Backset is measured from the centre of the keyhole to the edge of the lock. Most backsets are commonly measured at either 44mm (for a 64mm (2½”) lock) and 56mm (for a 76mm (3”) lock). Typically a lock adjacent to a glass panel will be 2½” (44mm) and otherwise 3” (56mm), but you should always measure to be sure.
Determining the backset and overall length can be done by removing the existing latch and taking the dimensions. If the door handle or knob is still in place and you'd rather not remove it then you can measure from the edge of the door to the centre of the spindle hole (centre of the handle/knob).
The backset is the distance from the edge of the door to the centre of the door handle. Please note that our locks and latches mostly come in 44-46mm and in 57-60mm. 57-60mm is the standard backset.
The door backset is the distance from the edge of the door to the center of the 2-1/8-inch bore hole for the door knob, lever or deadbolt. In the United States, there are two common backsets for residential door locks: 2-3/8 inches. 2-3/4 inches.
Backset Information
When looking for any deadbolt, knob, or lever product, it is important to measure the backset of the door on which it is going to be installed. This will ensure the lock you are purchasing will fit properly. The backset is measured from the center of the hole for the lock to the edge of the door.
Most door latches on the market today are adjustable, so that you can change the backset between 2-3/8" and 2-3/4".
You can work out the size of the lock by measuring the distance from the edge of the door to the centre of the door handle or knob. This measurement will give you the approximate size of the backset which will allow you to identify which size lock or latch you have.
Almost ALL domestic mortice locks and tubular latches are supplied with either a 44mm or 57mm backset length. These equate to case sizes of 2.1/2" or 3" in imperial measurements.
To determine the correct backset measurement for your door, you need to measure the distance from the edge of the door to the center of your cross bore. The two standard backset measurements in North America are 2 3/8 inches and 2 3/4 inches.
Backset refers to the measurement that comes from the edge of the door to the center of the lock hole. Measure the distance from the edge of the door to the centerline of the lock hole. 2-3/4″ is the stand backset for commercial doors.
What is the backset on a Night Latch? The backset on a night latch is the distance from the centre of the keyhole to the edge of your door, you will find most night latches will have a 60mm backset.
The backset measurement is also an important thing to consider when choosing latches and door knobs/handles. The backset is the distance from the edge of the door to the spindle mechanism on the latch. Usually a 63mm case measurement will have a 44mm backset and a 76mm case measurement will have a 65mm backset.
The length of lock you need will depend on the thickness of the door, so begin by measuring that. Typically, full-size euro lock sizes range between 60mm and 120mm, with the central cam located precisely halfway along the barrel. Meanwhile, half euro cylinders are on average between 40 and 50mm in length.
Kwikset deadbolts can fit doors that are 1 3/8" to 1 3/4" standard. You can get a thick door kit to allow the deadbolt to fit on a door that is up to 2 1/4" thick.
A deadbolt lock is typically installed 6 or 12 inches above the key lock (roughly 44 inches from the bottom of the door). Using the tape measure, determine an appropriate spot and mark it on the edge of the door (the part through which the bolt is going to extend).
The best drill bits for drilling locks are either tungsten carbide-tipped drill bits or cobalt drill bits. Tungsten drill bits can be used to drill lock components made from bronze alloys, cast iron, alloyed steel, and hardened steel.
Commercial locks are different from residential locks because they need to handle the unique demands of a business or commercial real estate property. Generally, commercial-grade door locks are durable, secure, and can be convenient for daily users.