Door Lock Gearboxes & Locking Mechanisms
38 centre-case gearboxes from ERA, FUHR, FULLEX, GU, YALE, MACO, WINKHAUS, LOCKMASTER, KENRICK and ASEC — stocked at our Kirton trade counter for same-day collection.
✓ Like-for-like replacements ✓ New installations ✓ Expert identification advice ✓ Trade & cash pricing
✓ Yale, MACO & Winkhaus stocked ✓ ERA, FUHR, FULLEX & GU stocked ✓ Same-day collection ✓ Bring your old gearbox in for matching
Before You Order
How to Identify the Right Gearbox
A gearbox is the central locking mechanism inside a uPVC door — it controls the latch, deadbolt or hookbolt when the handle is lifted or the key is turned. To find the correct replacement, you need to know three things:
1. Backset
The distance from the edge of the door to the centre of the spindle hole. The most common backset sizes are 30mm, 35mm and 45mm. Measure from the faceplate edge to the centre of the handle spindle.
2. Centres
The distance between the centre of the spindle hole and the centre of the euro cylinder hole. Most common is 92mm. Twin spindle gearboxes also have a second measurement — typically 92-62mm.
3. Spindle Type
Single — one continuous spindle through both handles. Split — two separate spindles, outside handle can be locked independently. Twin — two spindle holes at different centres for specialist configurations.
💬 Not sure? Bring your old gearbox into our Kirton trade counter — our team will identify the correct replacement. Or call us on 01775 661 186 before your visit.
