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Detailed Guide to Choosing Your Deadlock
Matching Security Level to Your Door
When selecting a standard mortice deadlock, consider the door’s location and security needs. A 3 lever mortice deadlock suits internal doors or low-risk rooms, while a 5 lever BS3621 mortice deadlock is preferred for front and back doors to meet UK insurance guidelines. Available case sizes include 64 mm (2.5") and 76 mm (3").
These locks work perfectly with standard profile escutcheons to achieve a neat keyhole finish, and pair well with a variety of door furniture styles for a coordinated look. For more hardware solutions, explore our wider Architectural Ironmongery range, our selection of Window Furniture, and our premium Accessories to complete your security upgrade.
Need Expert Advice?
Get the Right Lock First Time
We can guide you on external door deadlocks, insurance-approved BS3621 locks, finish matching, and sizing to ensure you choose the most secure option for your property.
See related pages for more options:
- 3 Lever Mortice Deadlocks – ideal for internal doors or low-security applications.
- 5 Lever Mortice Deadlocks – recommended for external doors and meeting UK insurance standards.
- Sash Locks – combining a deadbolt and latch for convenience and security.
If you can’t find what you’re looking for, contact us and we’ll be happy to help.
Frequently Asked Questions
What is a mortice deadlock?
What is a mortice deadlock?
A recessed lock that operates with a key on both sides, using a solid deadbolt for secure locking.
What’s the difference between 3 lever and 5 lever deadlocks?
What’s the difference between 3 lever and 5 lever deadlocks?
3 lever is for medium security (internal doors), 5 lever is for high security (external doors, often BS3621-approved).
Do I need BS3621 for my main door?
Do I need BS3621 for my main door?
Many insurers require it for external door compliance.
Can deadlocks be keyed alike?
Can deadlocks be keyed alike?
Yes, so one key can open multiple deadlocks.
What finishes can I choose?
What finishes can I choose?
Satin chrome, polished brass, and matte black are the most popular.
Nationwide Supply & Trusted Brands
Security Hardware You Can Rely On
We supply mortice deadlocks UK-wide, covering London, Manchester, Birmingham, Leeds, Glasgow, Cardiff, and beyond. Our range includes locksmith-recommended designs, solid deadbolt mechanisms, anti-drill plates, and precision-engineered lock bodies for lasting security.
Popular with both trade professionals and homeowners, our selection features leading brands such as From The Anvil for handcrafted ironmongery, Carlisle Brass for high-quality security hardware, Heritage Brass for traditional finishes, and Frelan Hardware for modern designs.
Complete your door setup with matching Door Furniture for style and function, and Standard Profile Escutcheons for a neat, secure keyhole finish.