Briton 5250.57.S.SS | Night Latch 57mm Backset - Square Forend (5250)
Finishes: SS Stainless Steel
The Briton 5250.57.S.SS night latch is a high-quality, dual-profile mortice night latch designed for secure, reliable performance on front entrance doors, internal doors, and in commercial applications. Featuring a 57mm backset and square forend in durable satin stainless steel (SS), this model from the trusted Briton 5200 series combines versatility, strength, and ease of installation. Key features of the Briton 5250.57.S.SS include compatibility with both Euro and oval-profile cylinders (cylinder not included), enabling flexible use with standard key cylinders. The night latch automatically locks when the door closes, with internal operation via a half-set of levers to retract the latch bolt for easy exit. From the outside, a single key turn withdraws the latch, while the integrated anti-thrust feature prevents unauthorised manipulation or forced entry when the door is closed.
- Additional Product Details
Night Latch 57mm Backset - Square Forend.
- Night latch function operated by a half set of levers*, with the lever on the inside used to withdraw the latch bolt and open the door
- A single cylinder on the outside operates the latch bolt with a single key turn
- Anti-thrust feature prevents manipulation of the latch bolt when the door is closed
- Unique X-Tension feature allows the spring tension to be adjusted to suit the weight of lever furniture and to eliminate lever 'droop'
- Quick reversible latch without the need to dismantle the lock case
- Latch bolt may be held in by rotating the knurled wheel on the forend of the lock
- 57mm backset in line with the guidance of BS 8300
- Euro profile cylinder centres 47.6mm and oval cylinder centres 48mm
- 10-year guarantee
*Lever handle half set on backplate - the lock case is not prepped with holes at 38mm centresIMPORTANT - For fire door installations, the lock must include intumescent protection to maintain the door's integrity.
The Briton 5200 Series is a contract-quality mortice lock case range compatible with Euro or oval-profile cylinders. The Series offers the most common range of lock functions. Performance Level 3.
Briton Fire Door Closers | Briton Exit Devices | Briton Locks
Relcross Limited (trading as) Door Hardware Online | Hambleton Avenue | DEVIZES | Wiltshire | SN10 2RT | United Kingdom | T: ++ 44 (0) 1380 720 062 | F: ++ 44 (0) 1380 729 888 | E: britonsales@doorhardware-online.co.uk
- Certification
EN 12209: 2003/AC:2005
90 Mins Timber | 240 Mins Steel | Warranty: 10 Years (Mechanical)
Certificates, including DoPs downloadable here
- Resources | Downloads


