UK oval-profile cylinders — overview and Vancouver replacement
Oval-profile cylinders (also called British oval, UK oval, or BS oval) are the standard cylinder format used in UK and Commonwealth-spec mortise locks. They sit in a roughly egg-shaped opening in the lock body and turn a cam to operate the bolt. You'll find them in older Vancouver heritage properties imported from UK manufacturers, in some commercial installations using British hardware, and increasingly in modern smart-lock retrofits that adopt the European cylinder format for compatibility.
The cylinder dimensions matter — overall length (60mm, 70mm, 80mm, 90mm), and the split between the inside and outside (30/30, 30/40, 40/50, etc.) determines which replacement fits your door. Measure carefully before ordering, or bring the existing cylinder to our shop and we'll match it.

