Why Won’t My New Deadbolt Lock Fit On My Door?


Your a Do It Yourself kind of person. You go out and buy a lock from a big box or hardware store. You expect that it should fit right on your door and replace that lock that has been giving you nothing but problems. You’ve managed to remove your old lock from the door without an issue. Things don’t seem to be going together too well for you with the new lock. Since there are different types of locks available to consumers it is possible that you simply bought the wrong lock. If the parts from your new lock don’t reasonably resemble the parts from your old lock then chances are it’s the wrong lock.

About Deadbolt Locks

A Deadbolt lock is one that is usually on an entrance door and is in most instances independant of any other type of lock set on a door. A deadbolt usually has a facing that accepts a key and in most instances there is a finishing ring that goes around the face of the lock. This ring usually has the face of the lock sitting approximately 1 to 1-1/2 inches off of the surface of the door. There is a bolt that is associated with this style of lock that fits down a hole in the edge of your door. The door edge may be mortised out (have wood removed) to accommodate a finishing plate but these locks are also supplied with a drive-in type bolt. A drive-in bolt is usually a bolt that is driven into a door edge with a hammer, hence the name “Drive-In”. Usually the area of the door edge surrounding the drive-in bolt is not mortised out. Most newer deadbolt locks require a one inch in diameter hole in order to accept the bolt portion of the lock down the door edge. Many older doors are prepared with a 7/8ths inch hole. Now you might think to yourself, what’s an eighth of an inch but it’s really 2/8ths of an inch because of both sides of the bolt. If you are unable to comprehend what we’ve just told you then perhaps this job is best left in the capable hands of a trained professional locksmith technician. If you are good with a drill, you could use a one inch spaded bit to enlarge this hole to accept the new bolt.

There Are Other Considerations

Most of the deadbolts available today are supplied with a bolt that has an adjustable backset. For those not familiar with the term “Backset” it is the measurement that is taken from the leading edge of the door to the center of the hole on the facing of the door. Those who are not familiar with the term “Leading Edge”, it is the first door edge to meet the frame as the door is being closed into the frame. If you do not understand these two concepts then you really should hire someone with the knowledge to get this job done for you.

More Considerations

It is quite possible that the deadbolt you purchased requires an accommodating 2-1/8 inch hole in the door facings. There are two standard sizes of holes drilled through the facings of doors, 1-1/2 inch and 2-1/8 inch. Some deadbolt locks will only properly fit on a door that has 2-1/8 inch holes bored into it’s facings. If the outside ring of the lock fits flush against the door surface then you are ok. There should be nothing sitting above the surface of your door that would allow a crowbar or screwdriver to get underneath and be able to pry it off of your door. Some lock sets adjust this way and some don’t. There are many different designs and far too many to cover them all in this blog.

Still Having trouble?

If you are having difficulty in understanding the concepts that we have put forth here then perhaps it really is time to hire someone that can properly install this lock for you. There is no sense in putting your property and your hard earned belongings at risk.

Security Article Written by: Toronto Locksmith



This Article is Copyright and may not be re-published without express written consent.