There are two general types of doorknob assemblies: mortise-mounted and bore-mounted.
Mortise-mounted hardware relies on a large, rectangular metal box to hold its moving parts. Because of its design, it must be installed into a hand-chiseled cavity that centers at the edge of the door between its inside and outside faces.
This type of assembly is expensive to buy and install. Having said that, most mortise style door hardware is of the very highest quality and function.
The lock actions are smoother, more secure and have several features that enhance ease of use and smooth operation.
Bore-mounted hardware costs less to install because drilling is used instead of chiseling. A drilled installation can literally cut hours off a mortised installation.
The knobs (or levers) are made of thinner and less expensive metals giving them a flimsy, tinny feel. And if the knob includes a key lock, the less expensive ones can be easily opened by most amateur burglars.
If the door hardware you’re considering is under $25, chances are the finish will begin to wear off in two or three years.
There are two basic styles of bore-mounted hardware: 1) exposed mounting screw type and, 2) the concealed mounting screw type. You can tell which type you have by looking at the escutcheon (trim ring) between the knob and the door.
If you can see screw heads in one of the trim rings, you have the exposed mounting screw type. If screws are not visible, then you have the concealed type.
Concealed-screw hardware is better looking.
With exposed screw hardware, when screw pressure is applied to the trim plate to hold it tightly in place, there is a chance of bending the finished surface.
Leaving the screws loose enough to prevent damage to the trim plate can result in the frequent need to retighten the hardware — a nuisance at best. For less maintenance and a cleaner appearance, concealed screw doorknob assemblies are superior.
The locking method also is another consideration. There are two basic choices: Manual relock, must be relocked with a key or the twist of a lever each time it is unlocked with a key.
This is the best type of lockset for a bedroom or a bathroom where you don’t want to be accidentally locked out.
The auto relock type is preferred for exterior doors where you don’t want to have to remember to relock the door once you’ve let yourself into your home.
For tips from James and Morris Carey, go to www.onthehouse.com or call the listener hot line, 800-737-2474, ext. 59. The Careys are also on KRKO (1380-AM) from 6 to 10 a.m. every Saturday.
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