Three Fullex Type A door lock centre case gearboxes, shown from different angles, featuring robust metal construction and brass components for uPVC and composite doors.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
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Three Fullex Type A door lock centre case gearboxes, shown from different angles, featuring robust metal construction and brass components for uPVC and composite doors.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

Fullex Type A Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 37mm Backset 68mm PZ

FullexSKU: HS3263
162 reviews from verified buyers
Price:
£79.99

Key benefits

  • Direct Fullex replacement - matches the model in your door
  • Restores multipoint lock function - saves replacing the full strip
  • Check the model on your existing case - before ordering they vary

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Description

Fullex Type A Replacement Gearbox

Need to fix your Fullex multipoint door lock? The Fullex Type A centre case gearbox is the mechanism inside your door that is operated by the handle. It is the part most likely to fail when a uPVC door lock stops working.

Replacing just the gearbox is far more cost effective than buying a complete new multipoint lock. The centre case simply re-attaches to your existing locking strip, so you do not need to replace the entire mechanism.

Key Measurements

The most important measurements to check before ordering are 37mm Backset and 68mm PZ (the distance between the handle spindle and the keyhole).

This gearbox is non-handed, which means it fits both left-handed and right-handed doors without modification.

Spindle Options

Single Spindle — for lever/lever handle operation (handles on both sides of the door).

Split Spindle — for lever/pad handle operation (restricts access from outside, ideal for

front doors).

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Frequently Asked Questions

The Fullex Type A gearbox is the central component of a multipoint door locking system. It controls the handle and key mechanism, ensuring all locking points engage securely.

Common signs include a stiff or loose handle, difficulty locking or unlocking the door, or the locking points not engaging properly. Ignoring these issues can lead to complete lock failure.

No, compatibility depends on key measurements such as backset, PZ centres, and the lock configuration. Always check your existing gearbox specifications before replacing it.

Yes, in many cases you can replace just the gearbox rather than the full multipoint locking system, making it a more cost-effective repair.

A worn gearbox can eventually fail completely, leaving your door stuck locked or unlocked and compromising security. Learn more in The Silent Door Failure: How a Worn Gearbox Can Lead to Complete Lock Breakdown.