A set of metal door lock center cases designed for uPVC doors, displayed in a disassembled manner.
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 set of metal door lock center cases designed for uPVC doors, displayed in a disassembled manner.Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.

Mila Gearbox Single Spindle – Replacement Centre Case for uPVC Multipoint Door Lock – 35mm Backset 92mm PZ

MilaSKU: HS4156
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Price:
£47.99

Save £15.00 — limited stock at this price

Key benefits

  • Direct Mila replacement - single or twin spindle versions
  • Restores multipoint lock function - saves replacing the full strip
  • Standard Mila dimensions - measure your case before ordering

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Description

Mila Single Spindle Replacement Gearbox

This genuine Mila centre case gearbox is a direct replacement for Mila multipoint door locks with single spindle operation. It is the mechanism inside the door that is operated by the handle and is the most common part to fail.

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

Key Measurements

The most important measurements are 35mm Backset and 92mm PZ.

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

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Frequently Asked Questions

The Mila single spindle gearbox is the central mechanism in a multipoint locking system, designed to control both the handle and key operation through a single spindle setup.

A single spindle means the internal and external handles operate using one shared spindle. This design is common in many standard uPVC door locking systems.

Common signs include a stiff or loose handle, difficulty turning the key, or the door not locking properly. These issues usually indicate internal wear within the gearbox.

No, compatibility depends on measurements such as backset, PZ centres, and the specific lock configuration. Always match your existing gearbox before purchasing.

Multipoint locks secure the door at several points along the frame, improving both security and sealing. Learn more in Beginners Guide to uPVC Door Locks.