Which Lock Or Latch Do You Need?

Author: Carl Benson

Carl is the founder of Suffolk Latch Company, with a background in engineering and over 20 years’ experience in home hardware. He works closely with suppliers and designers alike to develop quality ironmongery that stands the test of time. (Read my full bio.)

Introduction

The choice of fittings for your door knob or door handle can be confusing. So many different sizes and options. Following our previous blog, Choosing The Right Tubular Latch, read on for a simple overview of how to choose the right lock or latch for your door.

Tubular Latches

A tubular latch is the most common type of latch used for internal doors that do not require a lock. It allows the door to open and close using a handle or knob without securing it in place. These latches are fitted inside the door edge and operated by a spindle connected to the handle or doorknob.

Tubular latches are available in several sizes to suit different door thicknesses and handle styles. The most common backset measurements are 2.5", 3" and 4", with the largest 4 Inch versions being used for door knobs rather than handles.

For heavier or unsprung door knobs and handles, heavy-duty tubular latches are recommended as they offer a stronger spring mechanism to allow the handle to return.

Sash Locks

A sash lock combines a latch and a lock within one unit, making it suitable for doors that need both everyday use and additional security. The latch keeps the door closed when operated by a handle, while the lock is controlled separately by a key or thumb turn.

Sash locks are commonly fitted to internal and external doors, depending on the level of security required. The two most common backset sizes are 2.5" and 3", which align with standard handle positions on most doors.

Internal & External Door Sash Locks

When choosing a sash lock, you must consider the door’s function and security level required. For internal doors a 3-lever sash lock can be used and is suitable for a range of different doors and uses.

For external doors, a 5-lever sash lock is reccomended due to its increased security rating. These are also usually recommended as a minimum standard of lock by insurance companies to ensure that policies are valid. 

Another option for external sash locks are Euro Profile sash locks; these operate with the use of an interchangeable euro lock which can be various degrees of security such as 15 pin locks. 

3 Lever Sash Lock

5 Lever Sash Lock

Bathroom Locks

Bathroom locks are designed to offer privacy rather than high security. It works in a similar way to a sash lock but is operated by a thumb turn mechanism instead of a key. This means the door can be locked from the inside for privacy but still opened from the outside in an emergency using a small release slot.

Our bathroom sash locks are available in 2.5" or 3" sizes and are compatible with all of our turn and releases, allowing you to choose the perfect design to match your style.

We also offer an alternative option of bathroom deadbolts and tubular latches; these work in the same way but give more freedom to the height that the latches can be fit into the door, making them an ideal choice for door knobs instead.

Conclusion

Choosing the right lock or latch depends on the type of door and how it will be used. For simple internal doors, a tubular latch provides smooth operation without a locking function. Where extra security is needed, a sash lock combines convenience and protection in one unit. Meanwhile, bathroom locks offer essential privacy with an easy-release mechanism for safety.

By understanding the purpose and features of each option, you can select hardware that suits both the style and function of your doors throughout the home.