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Installation Instructions

General Installation Information

The following information is designed to provide assistance pre–purchase and post–purchase and will help ensure that you choose the right Master Lock for your application.

All Master Lock products are packaged with installation instructions. If the package you have purchased does not contain installation instructions, please download your instructions below. You will need to know the the model number which can be found on the package.

New Construction or Remodeling?

When choosing door hardware, there are two types of installation. For new construction or remodeling, new doors can be purchased with or without pre–drilled holes. Adding locks to doors with pre–drilled holes is a simple process for the average do–it–yourselfer. If you choose a door without pre–drilled holes, you will need to prepare the door for the hardware installation. This preperation includes drilling holes in the edge and in the face of the door which can be a complicated process. If you feel this preperation is beyond your capabilities, many home centers and specialty door shops will drill the holes for you.

On the edge of each door with pre–drilled holes, there is a door latch cut–out. This cut–out usually comes in “radius edge” or “square edge”. Less common but more prominent in certain areas of the country is a “drive–in” door preparation. If the door has a 1″ hole drilled in the edge, a latch is “driven” into the door, wedging it into the core of the door.

Door Thickness

Most standard doors have a thickness of 1–3/4″, but it is necessary to measure this dimension to determine what your needs are for your door hardware. Please refer to the installation instructions and technical specifications of each Master Lock product to make sure your door and the door hardware you choose are compatible.

Backset Measurements

The backset is the measurement between the edge of the door to the center of the hole drilled for the lock. Several types of latches are available, and normally are adjustable from 2–3/8″ to 2–3/4″. To determine your backset, measure the distance from the center of the hole drilled in the face of the door, to the door edge.

Plain Latch

1/2″ beveled latch used primarily for interior doors (interior locking and nonlocking functions).

Latch Information

The latch is the mechanism that throws the bolt when the knob, lever, handleset or deadbolt is turned. There are four types of latches:


1/2″ beveled latch with a deadlocking bar used for keyed applications. The deadlocking bar prevents the latch from being forced back and deters credit card entry.


1″ throw bolt that locks into position and cannot be forced back. It contains a hardened steel pin to prevent saw through attempts.

Adjustable Latch

An adjustable latch allows the door hardware you choose to be used on doors prepared with either a 2–3/8″ backset or a 2–3/4″ backset. (The backset is the measurement from the edge of the door to the center of the pre–drilled hole.)

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