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The backset is the distance from the edge of the door to the spindle mechanism on the latch. Usually for a 63mm case measurement it will have a 44mm backset and for a 76mm case measurement will have a 65mm backset. The backset you choose is where your door knobs will sit on the door (where the spindle goes through).
What is the standard door backset?
The backset is the distance from the edge of the door to the center of the 2-1/8-inch bore hole. In the United States, there are two common backsets for residential door locks: 2 3/8 inches and 2 3/4 inches.
How do you measure a door backset?
The backset is the measurement from the edge of the door to the center of the bore hole. Most door handle sets feature a 2-3/8″ or 2-3/4″ backset. To determine the backset on your door, measure the distance from the outer edge of the door, to the center, or highest point of the bore hole.
What determines backset on a door knob?
Backset: A backset is the distance from the center of the cross bore, to the edge of the door. 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.
What is the most common backset?
Standard backsets are either a 2 3/8″ backset, or 2 3/4″ backset. The most common backset is 2 3/8″ but 2 3/4″ is also quite common – usually used on exterior doors. Sometimes it’s easier to measure from the edge of the door to the highest point on the bore hole.
What size backset do I need?
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.
What is case and backset?
The backset measurement is the distance from the centre of the keyhole, to the leading edge of the lock. The most common sizes here are 44mm (on a 64mm / 2.5″ lock case), and 56mm (on a 76mm / 3″ lock case).
What is the typical backset for residential exterior doors?
Backset: Measure from the edge to the center of the drilled knob area; 2.375-inches (2 3/8-inches) is the modern standard.
What does 60mm backset mean?
‘Backset’ is the distance from the front of the lock to the centre of the spindle as shown here. 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. Commercial (DIN) lockcases are 60mm backset.
What is a cross bore hole on a door?
The Bore hole is the large diameter hole where the door knob is mounted. Through the edge of the door there is a 1″ cross bore that extends from the edge of the door through the bore hole. This cross bore is where the latch is installed.
Are all door latches the same size?
We generally recommend that a 76mm Overall Latch Size is ordinarily the best size for most lever handles. The larger sizes of latch are usually used for Door Knob furniture. We would usually recommend using the 102mm (4”) Tubular Latch or larger for a door knob, but the 76mm (3”) can be used as an absolute minimum.
How do I know what door knob to buy?
The main measurements you should determine are: Backset — The distance from the edge of the door to the center of the knob. Cross Bore — The hold along the edge of the door frame. Door Thickness — This usually ranges from 1 ¼ inches to 3”, with exterior doors frequently being thicker than interior ones.
What is a backset on a door latch?
The backset is the distance from the edge of the door to the spindle mechanism on the latch. Usually for a 63mm case measurement it will have a 44mm backset and for a 76mm case measurement will have a 65mm backset. The backset you choose is where your door knobs will sit on the door (where the spindle goes through).
What does LOB mean on door handles?
LEVER ON BACKPLATE LEVER LOCK: Backplate has a key hole, for use with a sash type lock which contains a lock and a bolt.
What is a 65mm latch?
An internal door latch allows you to close a door and keep it in place without locking it. These sizes are the overall length of the latch, or the case. When measured to the spindle mechanism, the backset, then they translate as 44mm for the 65mm case and 57mm for the 76mm case.
How do you measure a backset on a mortise lock?
You can measure the mortice locks by measuring the backset and the centre. It is also advised you measure the case width and height and the forend length and width. Backset – The backset is measured through measuring from the centre of the keyhole to the forend of the mortice lock.
