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Different Kinds of Door Prep

Updated: Apr 28, 2023

Door prep refers to the process of preparing a door for the installation of hardware, such as locks, handles, hinges, and other types of door hardware. The specific type of door prep required depends on the type of hardware being installed and the type of door being used. Here are some common types of door prep:

Lockset prep

Typically referred to as 161 prep, this is the most common type of door prep and involves drilling holes in the door for the lockset and latchbolt. The size and location of the holes depend on the specific lockset being installed.

Mortise Prep

Often called 86 prep, mortise lock prep is a type of door prep that involves cutting a mortise (a rectangular recess) in the edge of a door to accommodate a mortise lock. Mortise locks are commonly used in commercial buildings and high-security residential settings because they offer superior strength and durability compared to other types of locks.

Hinge prep

Hinge prep involves cutting mortises (recesses) in the door and the door frame to accommodate the hinges. The size and location of the mortises depend on the size and type of hinges being used.

Panic device prep

Panic devices are typically used on commercial doors and require specific types of door prep. This involves cutting holes for the panic bar, as well as drilling holes for the mounting screws.

Door closer prep

Door closers are used to automatically close doors after they have been opened. Door closer prep involves cutting holes in the door and the door frame for the closer body and the arm that connects the closer to the door.

Flush bolt prep

Flush bolts are used on double doors to lock the inactive door in place while the active door is in use. Flush bolt prep involves cutting a mortise in the edge of the door for the bolt and drilling a hole for the strike plate.

Electric strike prep

Electric strikes are used to control access to a building and require specific door prep. This involves cutting a hole in the door frame for the strike plate and running wires from the strike to the control panel.


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