Yale Lockmaster Mila Master Slave Gearbox Door Lock 35mm Backset 92 PZ

Yale Lockmaster Slave Gearbox 35mm Backset 92PZ for French Doors - Mila Master & Millenco Compatible

Genuine Yale replacement gearbox engineered specifically for slave door locks in French door systems - no latch, no deadbolt, just precise multipoint connection.

Yale Lockmaster Slave Gearbox is the essential replacement component for the second-to-open door in French door configurations. Designed without a centre latch or deadbolt, this gearbox operates exclusively through lever/lever operation, connecting to top and bottom locking points while the false mullion strip covers the centre mechanism. Compatible with Yale Lockmaster, Mila master, and Millenco uPVC door lock systems, this genuine Yale component ensures reliable multipoint locking performance in dual-door installations.

This gearbox is supplied as a standalone unit that connects to your existing full lock faceplate. The single 8mm spindle configuration allows synchronized operation with your main door lock, maintaining security across both doors without redundant centre locking mechanisms that would interfere with the false mullion design.

Key Benefits:

• Genuine Yale Quality – Authentic manufacturer component ensures exact fitment and long-term reliability in your French door system, eliminating compatibility issues associated with aftermarket alternatives.
• Purpose-Built Slave Operation – Engineered specifically for second-to-open doors with no centre latch or deadbolt, preventing interference with false mullion strips while maintaining full multipoint security through top and bottom locking points.
• Multi-Brand Compatibility – Works seamlessly with Yale Lockmaster, Mila master, and Millenco door lock systems, providing flexibility when replacing legacy or mixed-brand installations.
• Precise 92PZ Specification – 92mm spindle-to-key measurement ensures proper alignment with standard uPVC door handle configurations, maintaining ergonomic operation and aesthetic consistency.
• Compact 35mm Backset – Shallow backset design accommodates narrow door stile profiles commonly found in French door constructions, where space is limited between the door edge and mullion.
• Single Spindle Simplicity – 8mm spindle operates lever handles on both sides without requiring split-spindle mechanisms, simplifying installation and reducing potential failure points.
• Professional-Grade Construction – 228mm case height and robust 47mm depth provide structural integrity for consistent locking point engagement over thousands of operation cycles.
• Non-Handed Design – Universal orientation eliminates left/right hand confusion during installation, reducing fitting errors and allowing inventory flexibility for trade professionals.

Product Specifications:

• Brand: Yale
• Model: Lockmaster 35mm Slave Gearbox
• Operation Type: Slave (Lever/Lever) - No latch, no deadbolt
• Locking Points: Connects to top and bottom points only
• Spindle Type: Single 8mm square spindle
• Cylinder Type: Euro profile
• Handing: Not handed (universal orientation)
• Authentication: Genuine Yale component
• Fixings: Not included (connects to existing faceplate)
• Compatible Systems: Yale Lockmaster, Mila master, Millenco

Note: This is a gearbox mechanism only and requires connection to an existing full lock faceplate assembly.

Dimensions:

• Backset: 35mm
• Centres (PZ): 92mm
• Case Height: 228mm
• Case Width: 15mm
• Case Depth: 47mm
• Spindle Size: 8mm square

Pro Tips:

Pro Tip: The false mullion strip on French doors conceals the centre mechanism, so you will need to remove this during installation. Always test operation with the door open before closing, as correcting misaligned cams requires full mechanism removal in slave door applications.

What's in the Pack:

• 1 × Yale Lockmaster Slave Gearbox (35mm backset, 92PZ)

Frequently Asked Questions:

Why doesn't this gearbox have a centre latch or deadbolt?

This is a slave gearbox designed specifically for the second-to-open door in French door configurations. The centre area is covered by the false mullion strip (the vertical piece between the two doors), so a centre latch or deadbolt would serve no purpose and could potentially interfere with the mullion's fit. The gearbox connects only to the top and bottom locking points, which is the correct operation for slave doors - the primary (first-to-open) door provides the main centre locking mechanism.

How do I know if I need a slave gearbox or a standard multipoint lock?

Check which door opens first when you unlock your French doors. The door that opens first (usually secured with a full multipoint lock including centre latch and deadbolt) is the master door. The second door that only opens after the first door is released is the slave door - this is where you need this gearbox. If you see a vertical strip covering the gap between closed doors (false mullion), the door behind that strip requires a slave gearbox without centre mechanisms.

Will this fit my Mila master or Millenco system even though it's branded Yale?

Yes, these systems share compatible gearbox specifications. Yale Lockmaster, Mila master, and Millenco slave gearboxes with 35mm backset and 92mm PZ centres are mechanically interchangeable. Always verify your existing measurements match (35mm backset and 92mm spindle-to-key distance) before ordering, but the brand marking doesn't affect compatibility when specifications align. The genuine Yale component often provides enhanced longevity compared to pattern parts across all three system types.

What fixings are required and why aren't they included?

This gearbox connects to your existing full lock faceplate using the integrated mounting points on the gearbox case. The faceplate screws into your door edge, and the gearbox slots into the faceplate mechanism. Fixings aren't included because you'll reuse the faceplate screws already in your door - removing and replacing the gearbox doesn't require disturbing these fixings. You'll need only a screwdriver to disconnect the old gearbox from the faceplate and connect the new one, making this a straightforward replacement job without additional hardware.

Why Choose Yale Lockmaster Slave Gearbox?

French door systems demand precise mechanical coordination between master and slave doors, and compromising on gearbox quality creates security vulnerabilities and operational frustration. This genuine Yale component delivers the exact specifications and build quality that professional installers specify for long-term performance. Whether you're maintaining a commercial installation or repairing your home's French doors, choosing the authentic Yale gearbox eliminates fitment issues, ensures consistent operation, and provides peace of mind that your multipoint locking system functions as the original manufacturer intended.