ASEC Deadlocking Nightlatch – 40mm Backset

Reliable Security with Added Protection

The ASEC Deadlocking Nightlatch – 40mm Backset is a high-quality replacement lock case designed to provide enhanced security for timber entrance doors. Featuring an automatic deadlocking mechanism, it offers increased protection against common methods of forced entry, making it an ideal choice for replacing a worn or damaged nightlatch.

Designed for smooth, dependable operation, the latch automatically locks every time the door closes, while the internal snib allows you to hold the latch back when convenient. The deadlocking feature also helps prevent the latch from being slipped or manipulated when the door is locked.

Whether you're replacing an existing lock case or upgrading your front door security, the ASEC Deadlocking Nightlatch offers reliable everyday performance at an excellent price.

Key Features

• 40mm backset
• Automatic deadlocking rim nightlatch
• Increased resistance against latch slipping
• Suitable for timber entrance doors
• Internal snib for holding the latch open when required
• Smooth and reliable operation
• Durable construction for everyday use
• Compatible with standard rim cylinders
• Easy to install
• Available in a range of finishes (subject to availability)

What's Included

• ASEC Deadlocking Nightlatch Lock Case (40mm Backset)
• Strike Plate
• Fixings
• Installation Instructions

Please note: This product is supplied without a rim cylinder, making it ideal if you're replacing the lock case while retaining your existing cylinder or fitting a new high-security rim cylinder separately.

Ideal For

• Replacing worn or faulty nightlatch lock cases
• Timber front doors
• Homeowners
• Rental properties
• Security upgrades

Why Choose the ASEC Deadlocking Nightlatch?

The automatic deadlocking function provides an extra level of protection compared to a standard nightlatch by helping to prevent the latch from being forced back using common burglary techniques. Compatible with most standard rim cylinders, it's a versatile choice whether you're keeping your existing cylinder or upgrading to a premium security option.

Why Buy From UK Lock Shop?

At UK Lock Shop, we don't just sell locks—we install and test them every day.

Every product we stock has been selected by professional locksmiths based on real-world performance, reliability and value. We only recommend products we'd be happy to fit for our own customers.

Every product tested by a locksmith.

🔑 Our 4 Key Rating

The ASEC Deadlocking Nightlatch is a dependable, well-engineered lock case that offers excellent value for money. It's easy to install, built to last and provides an extra level of security thanks to its automatic deadlocking mechanism. If you're replacing a worn nightlatch or pairing it with a quality rim cylinder, this is a lock we'd happily recommend.