At Master Lock, we want you to be sure that you have selected the door hardware product that best suits your needs. Here is some helpful information to aid in the selection process. Which function is right for you?

Exterior Locking
These door hardware products provide a dead locking mechanism that keeps the door from being opened without a key on the exterior side of the door. They can come keyed on the exterior side with a thumbturn on the interior side.

Exterior Single Cylinder Deadbolt
A single cylinder deadbolt is normally used on a front or back exterior door and is operated with a key from the exterior of the home and a thumbturn from the interior.

Exterior Double Cylinder Deadbolt
A double cylinder deadbolt is typically used on a front or back exterior door and is operated with a key from both the exterior and interior of the home. Double cylinder deadbolts are recommended when a window is in close proximity to the door. The interior keyway prevents an intruder from accessing your home by breaking the glass and turning the thumbturn to open the door. Please check your local fire codes.

Exterior Handleset
A handleset is operated with a key from the exterior of the home and a thumbturn from the interior.

Exterior Keyed Knob or Lever
These can be used in places such as entry doors, garage doors or in combination with a deadbolt product.

Interior Locking
A locking interior door product is normally referred to as a “privacy” or “bed and bath” door knob. This product is equipped with a turn or push button on the inside and comes with an emergency release on the outside that allows the door to be unlocked by inserting an emergency release tool.

Interior Non-Locking
Non-locking products are normally referred to as hall & closet or passage door knobs. These products have a latch that retracts when they are turned to allow entry, but do not provide a locking function.

Fixed Interior
These are typically used in applications that do not require a latch. An example would be a pantry that uses a magnetic latch.