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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 backset should I use?
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. Pack your locks with a 2-3/8-inch or 2-3/4-inch latch, depending on which backset you specify.
How do you measure the backset on a door lock?
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 does 40mm 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.
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.
How do I measure my backset?
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 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.
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).
How do I know what size door latch I need?
An easy way to choose which latch you need is to measure from the edge of your door to the centre of your door Stile. Choose the Backset which is closest to this measurement, and the handle will be as central as possible to the Stile on your door.
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.
How do you measure a backset hinge?
Hinge Backset The distance from the edge of the applied hinge leaf to the frame stop. This is a critical measurement and must be accurate within 1/32′′. The most common dimension is 5/16′′. The hinge backset on the door will be properly adjusted from this measurement (typical – 1/16′′) to ensure proper clearance.
What is the distance between the deadbolt and door knob?
The distance between a deadbolt and door knob is usually 5 1/2 to 6 inches above the handle. Most do not recommend placing it any higher than 6 inches from the original knob unless the situation calls for it.
What size is a deadbolt hole?
The deadbolt lock set will come with a template to help you with measurements. Be sure to use the correct size drill bits specified in the lock set instructions, though most standard deadbolts require a 2 1/8-inch hole saw for the lock bodies and a 1-inch spade bit for the sliding bolt assembly.
What size hole is needed for a door knob?
The Bore hole is the large diameter hole where the door knob is mounted. The standard sized bore hole is 2 1/8″ in diameter. 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.
What is a door latch?
Door latches are a type of mechanical hardware used to fasten doors and keep them shut. A door latch uses a fastener attached to two ordinarily separated surfaces, most often the door and the frame, to prevent the door from swinging while still allowing normal operation when the latch is released.
What is adjustable backset?
When replacing a door deadbolt, it might be necessary to adjust the lock’s backset. The backset is the distance between the edge of the door and the center of the lock hole on the door. Adjusting the backset ensures the deadbolt locks completely once you install it in the door.
