Best Mortise Locks for Security Door of 2025

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Mortise locks are an essential component in securing a door, providing an added layer of protection against intruders. These locks are designed to fit into a mortise, or pocket, within the door and require a key to operate. They are available in a variety of styles and finishes to suit different door types and decor. Mortise locks are recommended by security advisers for their durability and resistance to forced entry. They provide peace of mind and are an effective way to safeguard your home or business.
At a Glance: Our Top Picks
Top 10 Mortise Locks for Security Door
XFORT® 3 Lever Brass Mortice Sashlock
The XFORT® Brass Mortice Lock provides enhanced security with its solid brass latch and deadbolt, making it a reliable choice for safeguarding your home. It has been rigorously tested and is CE approved, ensuring it meets high safety standards, including fire rate testing. The unique ROTALATCH technology offers a patented latch bolt reverse system for added convenience. Additionally, this lock is designed for a wide application, fitting both left and right-handed doors, which makes it versatile for any internal wooden door.
Yale 5 Lever Mortice Deadlock for External Doors
The Yale Mortice Deadlock is an ideal choice for securing your external wooden doors. It meets the British Standard BS 3621:2007, ensuring maximum security for your home. This lock is also Secured by Design approved, giving you peace of mind. Additionally, it is recommended by insurance companies and the police, which can help you meet insurance requirements. With a stylish brass finish and a convenient 2.5 Inch/64mm backset, this deadlock not only enhances security but also complements your door's appearance.
TSS High Security Mortice Sashlock with Keys
The TSS Mortice Sashlock offers robust security for external doors, being insurance approved and compliant with British Standard BS3621:2007. It comes with three keys and easy-to-follow fitting instructions, ensuring you can securely install it with minimal hassle. The lock features high-security anti-drill hardened steel plates, which protect against tampering and forced entry. Additionally, the inclusion of anti-saw rollers in the deadbolt enhances your safety by preventing saw attacks, giving you peace of mind in your home security.
TSS High Security 5 Lever Mortice Sashlock
The TSS Mortice Sashlock offers high security for external doors, providing you with peace of mind. It includes three keys and fitting instructions for easy installation. This lock meets the British Standard BS3621:2007, ensuring it is insurance approved. Additionally, it features hardened steel plates that help protect against drilling attacks, while anti-saw rollers in the deadbolt offer further defence against sawing threats. With its design compatible with most external door locks, it’s a convenient choice for enhancing your home security.
TSS High Security Mortice Deadlock with Keys
The TSS Mortice Deadlock offers robust security for your external doors. Supplied with three keys and detailed fitting instructions, it ensures easy installation. This lock is insurance approved and meets the British Standard BS3621:2007, giving you peace of mind. With high-security anti-drill hardened steel plates, it protects against unauthorised access, while the anti-saw rollers in the deadbolt add an extra layer of defence against saw attacks, enhancing your home's safety.
TSS High Security 5 Lever Mortice Deadlock
The TSS Mortice Deadlock is designed for external doors, offering a high level of security with its 5 lever mechanism. You will receive three keys, along with fixings and fitting instructions for easy installation. This lock is insurance approved and meets British Standard BS3621:2007, ensuring peace of mind. Additionally, it features hardened steel plates that protect against drilling, as well as anti-saw rollers in the deadbolt, making it a robust choice to safeguard your property against common attack methods.
XFORT 76mm 5 Lever High Security Sash Lock
The XFORT 5 Lever Sash Lock offers exceptional security for both internal and external doors. Its lightly sprung mechanism allows you to lock and unlock your doors effortlessly, ensuring convenience in daily use. With a robust 5 lever lock system and a fully enclosed keep, this lock effectively prevents burglar manipulation, giving you peace of mind. Additionally, the reversible latch means you can easily install it on either left or right-handed doors, making it a versatile choice for any home.
TSS High Security Mortice Deadlock with Keys
The TSS Mortice Deadlock is a reliable choice for securing your external doors. Supplied with three keys and all necessary fixings, it ensures easy installation. This deadlock is insurance approved, meeting the stringent British Standard BS3621:2007, giving you peace of mind in terms of safety. Its high-security anti-drill hardened steel plates offer added protection against forced entry, while the anti-saw rollers in the deadbolt prevent tampering through sawing. This lock provides robust security for your home.
Ruveno Mortice Lock for Doors
The Ruveno Mortice Lock is designed with a robust build that has undergone high rate testing, ensuring durability and security for your doors. Its unique patented latch bolt reverse system provides added convenience, allowing for smooth operation. This mortice lock is compatible with both internal and external doors, offering versatility for your home or office. Additionally, it caters to both left and right-handed doors, making it suitable for a wide range of users.
DIDA® 3 Lever Polished Brass Mortice Lock
The DIDA® Mortice Lock offers enhanced security for your internal and external doors. Made from solid brass, the robust latch and deadbolt feature advanced rotalatch technology, ensuring peace of mind for you and your family. This lock is designed for versatility, fitting both left and right-handed doors and suitable for various private rooms. Installation is straightforward, as the lock comes complete with all necessary parts and three keys, allowing you to share access with guests or family members easily.
Frequently Asked Questions (FAQs)
1. Is a mortise lock more secure?
Mortise locks are one of the most secure forms of residential hardware available today. What makes mortise locks so much more secure than their cylinder counterparts? A pocket cut into the short edge of the door, allows a longer and thicker mortise box to slide into the door itself, providing superior protection.
2. Do mortise locks weaken the door?
Mortise lock cutouts may weaken the structure of the door– yet mortise locks are mysteriously stronger than bored cylindrical locks! They give more leverage and last longer than cylindrical locks, and their versatility allows more architectural conformity to existing security hardware.
3. Are mortise locks good?
Mortise locks are reliable and strong, thus offering good door security. The classical appearance makes them more attractive than cylinder locks. They're versatile, so you can use them with all kinds of door furniture and cylinders.
During our mortise lock for security door research, we found 116 mortise lock for security door products and shortlisted 10 quality products. We collected and analyzed 13,122 customer reviews through our big data system to write the mortise locks for security door list. We found that most customers choose mortise locks for security door with an average price of £16.88.
The mortise locks for security door are available for purchase. We have researched hundreds of brands and picked the top brands of mortise locks for security door, including XFORT, Yale, TSS, Xcel, Ruveno. The seller of top 1 product has received honest feedback from 2,145 consumers with an average rating of 4.9.

Corey Philips is an electrician and lighting expert. He graduated from the University of Birmingham in 2012 with a Bachelor's degree in electrical and electronics engineering. Corey is a specialist contractor in lights. He sells and installs and recommends lights and lamp sheds, and other lights accessories. Aside from that, Corey is vast in installing and maintaining electrical appliances like air conditioners, water heaters, and the likes.