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Frequently Asked Questions for Locksmiths in RI & MA

Frequently Asked Locksmith Questions

1) How do I determine the hand of my door?

There are 4 types of door handing. You will need to know this information when ordering doors and some types of door hardware. Stand on the outside of the door and see which of the following hands applies.

A)   Right hand – Hinge is on the right and the door opens in

B)    Left hand – Hinge is on the left and the door opens in

C)   Right hand reverse – Hinge is on the right and door opens out

D)   Left hand reverse – Hinge is on the left and door opens out

2) How do I determine the backset of the door?

To find the backset, measure the distance from the edge of the door to the center of the 2 1/8” hole for your hardware. Backsets are typically one of two sizes: 2-3/8 or 2-3/4”

3) How do I determine which knob function I need?

There are many functions a knob or lever can have. This can help you find exactly what you need for nearly any application.

A)  Passage function: This is generally a function for interior doors. Passage hardware is used where no lock is required. The knob still operated the latch but the knob does not lock.

B)  Dummy function: The dummy knob is generally installed on doors that do not function, doors that do not need to latch, or on the non-locking side of French doors. It is essentially a handle made to look like a knob. There is no latch to be turned, so the handle does not turn. It is only used to pull the door open.

C)  Privacy function: This function is used on doors that need to lock from the inside. It is commonly used on bathroom doors. There is a push button locking mechanism on the inside to prevent entry from the outside, and the button is released by turning the knob from the inside.

D)  Classroom Function: The common use for this function is exactly as the name suggests, but there are many other places this function would be helpful. From the outside of the door, it locks and unlocks by key only. The inside, however, is locked and unlocked by a thumb turn.

E)   Storeroom function: Storeroom function locks are always locked from the outside. You must always use a key to gain entry. There is no thumb turn on the inside of the door to allow it to remain unlocked. From the inside, however, you only need to turn the knob or lever to get out.