This Union StrongBOLT bathroom sash lock is ideal for residential, internal, wooden, bathroom doors. As they are part of the StrongBOLT family of locks, they can be used on fire doors.

It features both a latch and deadbolt. The deadbolt is operated by a turn and release or lever bathroom handles (both sold separately). The StrongBOLT bathroom mortice lock features a chamfered bolt design which increases the performance of the lock under side load as well as making a drilling attack more difficult. On top of the chamfered bolt design the sash lock is anti-pick, anti-saw and anti-drill.

In line with a number of other mortice locks, these locks feature a red lock case but they have unique measurements that identify them from other mortice locks. Please refer to the line drawing for details.

This bathroom mortice lock is available in either polished brass or satin chrome finishes in boxes.

The deadbolt throws 14mm. If higher security is required, or the ability to lock the bathroom door from the outside, we'd recommend a euro case mortice lock with key and turn euro cylinder.

From the inside, the deadbolt is locked and unlocked by turning the thumb turn. From the outside, the deadbolt can be locked or unlocked using the emergency release.

The latch is withdrawn from either side by moving the handle.

The latch follower is 8mm and the deadbolt follower is 5mm.

This lock is supplied with a striking plate in a finish which matches the lock.

Suitable for use on most internal wooden doors. These locks are not handed and can be used on doors hinged on the left or right, which open inwards or outwards.

These locks do not use keys.

These locks cannot be keyed alike.

We stock a range of associated parts to these locks, including bathroom turn and releases and lever bathroom furniture in a range of different finishes. Please select the products you require from the associated products on this page.

These locks are CE and UKCA marked and tested to EN 1634-1 for use on 60 minute fire doors.

Please always check the relevant fire assessment, door specification or with the relevant authorities that this product is suitable for use in the specific environment that it is fitted in. You can find more details about the product on the DOP.

This lock has been independently tested by Certifire for its suitability for use on fire doors.

These locks do not feature an escape function and can be locked from the outside which may make them unsuitable for use in certain environments.

Union have manufactured high-quality, British designed locks and door hardware for more than 180 years. While their brand has evolved and grown to include a larger family of products over time, they all share a common purpose: a commitment to first class quality and design, with products that make the lives of their customers easier.

From humble beginnings in 1840, Union has grown from a family business to become a leader in British designed locks and door hardware around the world. They started in Willenhall, the heart of the British lock-making industry in the 19th Century. Today, Willenhall is home to their state-of-the art manufacturing facility and headquarters – an area steeped in heritage and history for the locks and door hardware industry.

Bathroom door locks do exactly what you'd expect - they lock bathroom doors! They don't use levers and keys, instead they normally use a bathroom turn and release or a set of lever bathroom handles. They are locked from the inside by rotating the turn to throw the deadbolt. From the outside, they can be unlocked by using the release. This is normally only needed in an emergency and can normally be operated with a coin or flat screwdriver.

Mortice lever locks (sometimes called mortise locks) are commonly fitted to wooden doors but can also be found used in steel, aluminium, and composite doors. They are locked from both the inside and outside with the key which throws the deadbolt. By definition, a mortice lock is fitted (“morticed”) within the door, rather than being fitted to the face or surface of it.

There are multiple types of lever lock in use in the UK. Dead locks (mortice dead locks) are operated by a key only whereas sash locks (mortice sash locks) feature a dead bolt and a latch which is operated by a handle (often a lever handle). Both lever locks with throw the dead bolt into a strike plate. The strike plate on sash locks also accepts the sprung loaded reversible latch.

Lever mortice deadlocks can be used for fitting to front or back doors and to internal doors and external doors, but we’d always recommend fitting a British Standard BS3621 product to external doors for maximum security. You should also check with the houseowner’s insurer’s requirements on both residential properties and commercial properties. You may find lever locks fitted to commercial properties but cylinder lock cases operated by a cylinder or pin tumbler lock are more common mortice locks fitted in commercial environments.

Lever mortice door locks are commonly used for internal doors too. These tend to be 3 lever mortice locks where the requirements for security and burglary prevention are lower.

When replacing an existing lever mortice lock, you may find that your replacement mortice lock is larger than the one that you are replacing. This may be because you are improving security, such as upgrading to a lock with thicker, anti-drill hard steel plates or because the forend length, forend width or the design of the lock has changed. The hole for the lock can normally be made larger with a hammer and chisel. This can also be the case for strikes, which may have changed design.

When fitting a lever mortice lock to new timber doors, we’d recommend using Souber’s DBB morticer for quick results. You can find the DBB1 morticer here: https://www.duffells.com/souber-dbb-mk2-mortice-jig.html.

Please always ensure that your door is sufficiently thick to accommodate the mortice lock that you are fitting. The Master Locksmith Association recommend a minimum thickness of 44mm.

A lever mortice lock prevents a door from opening by throwing a bolt from the lock into a metal keep or strike, fitted to the frame. Once the bolt is engaged in the keep, a hinged door is prevented from being opened. A mortice lock bolt is locked or unlocked from either the inside or outside by a key. Inside the lock, there is space for the bolt to be retracted. If the cuts in the key match the levers inside the lock, the user will be able to turn the key to throw (to lock) or withdraw (to unlock) the bolt. If the wrong key is used, the levers will not line up and the lock will not operate.

Duffells stocks a huge range of mortice locks at all levels of security. All of our lever mortice door locks are available for delivery in as little as 24 hours. We offer a range of express delivery options as well as standard delivery and you can find delivery details on our thousands of products on our delivery info page.

Bathroom Mortice Locks