The standard door thickness is anywhere from 1 3/4″ to 2″ thick. Most door hardware that you order or buy will adjust anywhere in between those measurements, maybe even a little bit more. Don’t be fooled by assuming your door is in fact standard.
Standard interior door jamb thickness on pre-hung doors is 4-9/16 inches. The door jamb is the frame that installs in the wall and supports the door via hinges. This thickness is designed for installation in a standard two-by-four wall (constructed by studs that are actually 1½ inches by 3½ inches).
Hold a tape measure to the edge of the door and record its thickness. Measure this edge on the door frame (known as the jamb), as well. These numbers should be close to the same, but it can be helpful to know both of them. The most common thickness is 1.75 inches (4.4 cm).
Simply put, a door jammer is a security gadget that people use to prevent their doors from being kicked in. The average quality door jammer is made of steel and weighs just under ten pounds, yet can withstand the force of a pick-up truck!
A jamb is the flat surface that runs vertically up either side of the door frame. This is where the hinges are placed to hang the door, as well as the striker plate on the opposite door jamb which helps you to open, close and lock your door. The door frame is all the elements combined.