Fuhr 856 Gearbox for Multipoint Door Lock 30mm Backset 92 PZ

Fuhr 856 Multipoint Door Lock Gearbox — 92PZ 30mm Backset uPVC Replacement

Genuine Fuhr 856 replacement gearbox — restore your uPVC multipoint door lock to full working order without the cost of a brand new lock.

Fuhr 856 Multipoint Door Lock Gearbox is a common failure point on Fuhr-equipped uPVC doors, and when it goes, the whole locking system can seize up or stop engaging properly. This single spindle gearbox is a direct replacement for the Fuhr 856 mechanism, letting you restore smooth, secure operation without replacing the entire door lock. It's built to a 30mm backset and 92mm PZ, and is non-handed, so it fits both left and right hung doors. Careful measurement of your existing lock beforehand will ensure a correct fit.

Manufactured by Fuhr to the same specification as the original equipment fitted to your door, this gearbox is built for durable, long-term performance under everyday use. Replacing just the gearbox, rather than the whole lock case, is a straightforward and cost-effective repair that most confident DIYers can carry out themselves.

Key Benefits for uPVC Door Owners:

• Cost-Effective Repair – Replacing just the gearbox costs a fraction of a full lock replacement, so you fix the fault without paying for parts you don't need.
• Non-Handed Design – Fits both left and right handed doors, removing the guesswork over which version to order.
• Genuine Fuhr Manufacture – Built to original Fuhr specification, so it matches the fit and performance of the part it's replacing rather than a generic substitute.
• Restores Door Security – A failing gearbox often means the multipoint locking points won't engage properly; this replacement restores full, secure locking across all points.
• Reversible Latch – The latch can be reversed for left or right configurations by undoing a single screw, making installation straightforward.
• 92mm PZ & 30mm Backset – Exact measurements matching common Fuhr multipoint lock cases, reducing the risk of ordering the wrong part.
• Lever/Lever Handle Operation – Simple lift-to-lock, turn-key operation that's familiar and easy to use day to day.

Product Specifications:

• Brand: Fuhr
• Model: 856 Single Spindle Gearbox
• Backset: 30mm
• PZ: 92mm
• Lock Case Length: 200mm
• Lock Case Depth: 45mm
• Lock Case Width: 15mm
• Centre of Latch to Centre of Deadbolt: 94mm
• Deadbolt Length: 31mm
• Deadbolt Thickness: 6mm
• Deadbolt Throw: 14mm
• Faceplate Screw Hole Spacing: 1st to 2nd 90mm, 2nd to 3rd 109mm
• Handing: Non-handed (fits left and right handed doors)
• Operation: Lever/lever, lift handle to lock

Please measure your existing lock case carefully — backset, PZ and faceplate hole spacing in particular — before ordering. If you are unsure which size you need, please contact us and we'll be happy to help.

Pro Tips:

Pro Tip: Older Fuhr 856 gearboxes used a 28mm latch, while newer versions use a 33mm latch (measured to the screw centre). If your existing latch isn't damaged, you can unbolt it with an Allen key and re-use it in the new gearbox — this avoids any mismatch with your door's keep.

Package Contents:

• 1 x Multipoint Door Lock Gearbox Only – Fuhr 856 Single Spindle Gearbox - 30mm Backset

Frequently Asked Questions:

Will this gearbox fit my uPVC door?
It's designed for Fuhr 856 multipoint locks with a 30mm backset and 92mm PZ. Check your existing lock case against these measurements, along with the faceplate screw hole spacing (90mm/109mm), before ordering to confirm compatibility.

Is this gearbox handed — will it fit a left or right opening door?
No, it's non-handed, so the same gearbox fits both left and right handed doors. The latch itself can also be reversed on-site by undoing a single screw.

How do I know if I need a new gearbox rather than a whole new lock?
The gearbox is the part most commonly at fault when a multipoint lock stops engaging or becomes stiff to operate. If the rest of your lock case, keeps and cylinder are in good condition, replacing just the gearbox is usually all that's needed.

What tools do I need to fit this gearbox myself?
Fitting is a straightforward DIY job for anyone comfortable with basic hand tools — you'll typically need a screwdriver and an Allen key, particularly if you're transferring the latch from your old gearbox.

My old latch is a different height to the new gearbox's latch — what should I do?
Fuhr changed latch height from 28mm to 33mm (to the screw centre) between older and newer 856 gearboxes. If your original latch is undamaged, remove it from the old gearbox using the Allen key bolt and refit it into the new one.

Why Choose the Fuhr 856 Gearbox?

As a genuine Fuhr part, this gearbox is built to the same standard as your door's original equipment, giving you confidence that the fit, feel and long-term durability will match what you're replacing. It's a practical, cost-effective way to restore secure, reliable operation to your multipoint door lock without the expense of a full replacement.

At JCP Hardware, we stock a comprehensive range of Fuhr locking components — if you're unsure on any measurement before you order, get in touch and we'll help you find the right fit.