What Is a Sash Lock?
What Is a Sash Lock? A Complete Guide to This Popular Door Lock Type
When selecting door locks for your house, you'll usually encounter a sash lock, particularly if you're looking for external doors or internal doors that have handles. So, what is a sash lock, and how is it different from other locks?
In this guide, we'll explain what a sash lock is, how it operates, where it should be used and how to select the best one for your door. Whether you're replacing exterior doors, remodelling your house, or need to know the difference between locks, we've got you covered.
What Is a Sash Lock?
A sash lock is a kind of lock that includes two functions: a latch that's operated by both a key and a handle, and a deadbolt which is locked and unlocked via a key. It's intended to be used with door handles and is usually mounted into the door edge, recessed into the timber.
In contrast to a deadlock, which is operated by a key and does not have a latch, a sash lock provides the ability to open and close the door via a handle without locking it, then lock it securely when desired using a key.
How Does a Sash Lock Work?
A sash lock has both a spring-loaded latch and a deadbolt in a single lock case. It works as follows:
- The door handle operates the latch so that you can open and close the door conveniently.
- The deadbolt is controlled by a key on the outside or a thumb turn on the inside (depending on the model).
When locked, the bolt protrudes into the door frame, making a solid connection.
This two-fold purpose makes sash locks highly convenient to use on external doors as well as internal doors where privacy or some extra security is necessary.
Where Are Sash Locks Typically Used?
Sash locks are commonly found on:
- Front doors and back doors of homes
- Side entrances
- Bedroom doors or bathroom doors where privacy is important
- Traditional wooden types of doors that require a handle and key mechanism
For external doors, it’s important to choose a high-security sash lock with at least five levers and a British Standard certification (BS3621).
Types of Sash Lock
A 3 lever sash lock is a practical and cost-effective choice for internal doors, offering a basic level of security suitable for bedrooms, bathrooms, and other interior spaces. It’s simpler to install than higher-security options, making it ideal for residential settings where ease of use and affordability are key priorities.
5 Lever Sash Lock
Designed specifically for exterior doors, a 5-lever sash lock provides a higher level of protection and is often insurance-approved, particularly those that meet the BS3621 standard. This type of lock is ideal for front or back doors where enhanced security is essential, offering peace of mind and compliance with most home insurance requirements.
Euro Sash Lock
A Euro sash lock is a door lock designed to work with a Euro cylinder, combining a latch (operated by the handle) and a deadbolt (secured by the key). It offers flexible security, as you can choose different Euro cylinders depending on your needs, such as anti-snap or high-security options. Unlike 3 lever or 5 lever sash locks, which have the locking mechanism built into the lock case and are operated by a traditional mortice key, Euro sash locks use a separate cylinder. The Euro sash lock stands out for its modular design and compatibility with modern security upgrades.
Each lever sash lock type has its own benefits, depending on where it’s installed and the security requirements of the space.
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Sash Lock vs Deadlock: What’s the Difference?
A deadlock is a basic lock that is operated by a key and has no latch or handle. When it's locked, the sole means of entry or exit is via the key, which is very secure but less convenient.
A sash lock, on the other hand, couples the ease of use of a handle with the security of a deadbolt. It's the preferred option for the majority of external doors where locking and ease of access are both in order.
Choosing the Right Sash Lock
When selecting a sash lock, there are a few important factors to take into account. Begin by determining whether the lock is to be fitted to an internal or external door, as this will dictate the level of security needed. If for external doors, the lock might need to comply with insurance specifications, so go for a 5 lever sash lock with BS3621 certification for maximum assurance. You will also need to measure the back set to ensure that the lock will sit properly into the door edge, and that it's suitable for use with your preferred door handles, as not all locks and handles are universally compatible. Getting it right guarantees correct operation, security, and peace of mind. Don’t hesitate to contact our team for advice if you are unsure.
Sashlock Installation Tips
Sash locks are fitted into a mortice, which is a pocket cut into the edge of the door. It’s a precise job that needs accurate measurement, especially when aligning with the door frame and handles. Unless you're confident with carpentry, professional installation is often the best route.
Also, check that your door handles are designed to work with a sash lock – they’ll need to operate the latch independently of the deadbolt.
Find the Right Sash Lock for Every Door
If you're after a lock type that weighs convenience against safety, then the sash lock is an excellent option. Whether you're locking exterior doors or introducing privacy to interior doors, the appropriate lever sash lock provides solid performance and long-term reassurance.
At DoorStation, we carry a large selection of locks to fit every door and every budget. From 3 lever locks for light usage to high security 5 lever sash locks for the front entrance of your home, we have the appropriate solution for you.
Browse our complete collection of door locks and accessories today, and if you're unsure what to choose, our staff are more than happy to help.
Frequently Asked Questions
Can I use a sash lock on an internal door?
Yes, a three-lever sash lock is ideal for internal rooms where you want some privacy and security.
Do I need a BS3621 sash lock for insurance?
For external doors, most insurers will expect a 5-lever sash lock that meets British Standard 3621.
What’s the difference between a sash lock and a euro lock?
Euro locks use a euro-profile cylinder, making them modular and easier to replace. Sash locks often have built-in lever mechanisms.
Is a sash lock more secure than a deadlock?
They serve different purposes. A sash lock offers convenience with reasonable security, while a deadlock provides stronger security but no latch functionality.
