Briton 5730 DIN Bathroom Lock Fire Rated

When a bathroom lock needs to go onto a fire door, you can't just reach for any off-the-shelf product and hope for the best. The Briton 5730 DIN Bathroom Lock is built specifically for situations where privacy and fire door compliance need to coexist — a requirement that comes up regularly in commercial buildings, hotels, offices, schools, and multi-occupancy residential developments.

The way it works is straightforward. Lever handles operate the latch from either side, while a single turn of the internal thumbturn throws the 20mm deadbolt — giving occupants the privacy they need. Critically, an emergency release on the outside means the door can always be opened from the corridor side when someone needs assistance, without tools or force. It's that combination of privacy and safety that makes it the right fit for communal and commercial bathroom environments.

On the fire compliance side, the 5730 has been independently tested to EN 1634-1 and carries Certifire approval when fitted with the appropriate intumescent kit. It's suitable for use on both FD30 and FD60 rated fire doors — something worth confirming at specification stage, along with the requirement that a suitable door closer is also installed to maintain fire door integrity. The lockcase meets BS EN 12209:2003, is CE marked, and features bolt-through fixing holes to DIN 18251, making it compatible with standard DIN format door preparations found across commercial projects.

Construction quality is where this lock earns its place on the spec sheet. The lockcase is galvanised steel with a satin nickel plating for corrosion resistance — important in bathroom environments where humidity is a constant factor. The forend is Grade 316 stainless steel, available in either radius or square profile to suit the door and frame specification, and the latch is quick-reversible for flexible handing on site. At 820g, it has the weight and substance you'd expect from a Briton product.

With a 60mm backset, 78mm centres, and a 10-year guarantee, the Briton 5730 gives specifiers and contractors the confidence that the product will perform — on day one and long after the project is handed over.