Briton 5710 DIN Series Fire Rated Euro Deadlock Case

When a commercial or architectural project specifies a euro cylinder deadlock on a fire door, there's no room for compromise on the hardware. The lock case needs to meet the fire test evidence, carry the right certifications, and be built to last in a demanding environment — not just tick a basic compliance box and hope for the best. The Briton 5710 DIN Series Fire Rated Euro Profile Deadlock Case is exactly the product that brief calls for.

This is a heavy-duty euro profile cylinder deadlock case built for doors that require key-operated locking without lever furniture. The cylinder is not included — you specify and supply the euro profile cylinder separately, which gives architects, specifiers and contractors full control over the security level, keyway system, or master key scheme being used across the project. The lock case provides the precision-engineered foundation; the cylinder determines the access control strategy.

The fire performance credentials are substantial and independently verified. The 5710 has been fire tested to EN 1634 achieving a 2-hour fire rating on timber doors and an impressive 4-hour rating on metal doors. It carries Certifire approval (CF741) and is CE marked and UKCA marked to BS EN 12209 — the full set of certifications a specifier needs when writing hardware into a fire door schedule. Suitable for both FD30 and FD60 fire doors, it's worth noting that the lock must be fitted with the Briton 5000.IP intumescent pack to maintain fire door integrity, and a suitable door closer must also be installed — both standard requirements for fire door compliance.

The build quality lives up to the spec sheet. The lockcase is galvanised steel with satin nickel plating that delivers 240 hours of corrosion resistance — important on high-traffic commercial doors where surface wear is an ongoing concern. The forend is Grade 316 stainless steel, available in either radius or square profile to suit the door and frame specification. A guided cylinder screw accurately aligns the fixing to the cylinder, ensuring a clean, precise installation rather than the guesswork that comes with less engineered products.

The 20mm single-throw deadbolt operates in a single turn — fast and reliable for day-to-day use. With bolt-through fixing holes to DIN 18251, a 60mm backset, and 72mm centres, the 5710 is dimensionally correct for standard DIN-format commercial door preparations. The lock is fully reversible, fitting left and right-hand doors without modification, and is compatible with Briton 4200 and 4700 Series door furniture for a coordinated hardware specification across the project.

Backed by a 10-year guarantee from one of the most established names in commercial door hardware, the Briton 5710 is the right choice for architects, main contractors, and specialist ironmongery suppliers who need fire door compliance and build quality that holds up for the lifetime of the building.