A metal door lock center case gearbox typically found inside a door, operated by a handle, with visible metal components and mechanisms.
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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A metal door lock center case gearbox typically found inside a door, operated by a handle, with visible metal components and mechanisms.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 Crimebeater Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm/45mm/55mm Backset 92mm PZ

FullexSKU: HS10798
162 reviews from verified buyers
Price:
£38.99

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 Crimebeater Replacement Gearbox

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

Replacing just the gearbox is far more cost effective than buying a complete new lock. The centre case re-attaches to your existing locking strip.

Key Measurements

The most important measurements are 35mm, 45mm or 55mm Backset and 92mm PZ.

This gearbox is non-handed, fitting both left and right-handed doors.

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Frequently Asked Questions

The Fullex Crimebeater gearbox is the central mechanism in a multipoint door lock. It controls the handle and key operation, ensuring all locking points engage securely.

Common signs include a stiff or floppy handle, difficulty turning the key, or the door failing to lock properly. These issues usually indicate internal wear within the gearbox.

No, compatibility depends on measurements such as backset, PZ centres, and overall lock design. Always match your existing gearbox specifications before purchasing.

Yes, in many cases you can replace just the centre case gearbox rather than the entire multipoint lock. This is often a more cost-effective solution.

A worn gearbox can compromise both security and usability, increasing the risk of lock failure or forced entry. Learn more in Why Most Homeowners Don’t Upgrade Their Door Locks (And Why It Costs Them).