Many older doors had bores that were been smaller.
Measurements for door locks.
Before purchasing a lock measure your door s backset cross bore and thickness to ensure you find the right fit.
In the united states there are two common backsets for residential door locks.
The distance between the edge of the door and the center of the lock hole.
Pack your locks with a 2 3 8 inch or 2 3 4 inch latch depending on which backset you specify.
When measured to the spindle mechanism the backset then they translate as 44mm for the 65mm case and 57mm for the 76mm case.
In most cases the door set which is inside of the door and controls the door latch.
Lock bore the diameter of the hole for the lock body.
The standard bore is 2 1 8.
Take care to measure carefully as matching the size can be especially problematic in older homes.
Before you learn how to change door locks measure the space where you ll install the replacement.
This helps to ensure that your door will fit.
Although they can come in different sizes the two most common sizes in the uk for internal door latches are 63mm and 76mm.
If you must it is always better to round down than round up.
That s the side without the lock if it s not an entry door and you re not sure.
Your cylinder locks should be as flush as possible with the handles maximum projection is 5mm if you current lock sticks out by more than 5mm either side of the hanldes then choose a smaller size.
Usually the backset measures 2 3 8 inches or 2 3 4 inches.
Cylinder door locks are not difficult to replace if you have basic diy skills you only need two measurements.
2 3 8 inches and 2 3 4 inches.
Measure the diameter of the holes currently cut out of your door so you can select a new door lock that fits those dimensions.
Shop door knobs handlesets.
Measure the width of the door in 3 locations.
You ll want to measure sliding doors from outside of your home looking at the exterior of the door.
Measure from the inside edge of the trim on one side to the inside edge of the trim on the other side to get your jamb width if there s trim installed or simply measure the jamb if it s unadorned.
As for how to measure a door frame.
Stand inside the open door facing the jamb.
If one wants to replace their locks on doors that have smaller diameter holes there are 2 options.
Opening heights 3 0 through 4 11 15 16 centered in door height not frame.
1 measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
Use the smallest figure as your measurement.
Most of the current locks require the standard 2 1 8 bore.
Measure from the floor to the underside of the trim at the top of the door.
Dummy sets have no latch and are surface mounted so you can install a dummy set wherever you choose on the door.
