A set of metallic silver door lock center cases and gearboxes, displayed from different angles, showing the mechanism used in multipoint door locks.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
A set of metallic silver door lock center cases and gearboxes, displayed from different angles, showing the mechanism used in multipoint door locks.
Diagram illustrating how to measure a Mila uPVC door lock centre case gearbox, showing the "Backset" (A) and "PZ" (B) dimensions for correct fitting.
ERA

ERA Gearbox – Replacement Centre Case for uPVC Multipoint Door Lock – Fits ERA Saracen Surelock – 35mm/45mm Backset 92mm PZERA Gearbox - 35mm/45mm Backset - 92mm PZ

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£35.99 £24.99 Sale SKU: HS2830
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Same-day dispatch on orders before 2pm

The gearbox is the most common part to fail on a ERA multipoint lock — replace just this centre case, not the full strip, and save.Check your backset is 35mm/45mm before ordering.

Key benefits
  • Replaces ERA Saracen Surelock - 35mm/45mm backset, 92mm PZ
  • Restores multipoint lock function - deadbolt and latch
  • Standard ERA dimensions - measure your case before ordering
Product overview

ERA Replacement Gearbox

This ERA centre case gearbox is a direct replacement for ERA, Saracen, Surelock, Laird and Fab & Fix multipoint door locks. It is the mechanism inside the door 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 lock. The centre case re-attaches to your existing locking strip.

Key Measurements

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

This gearbox is non-handed with a fully reversible latch, fitting both left and right-handed doors.

Compatible Brands

Suitable replacement for ERA, Saracen, Surelock, Laird and Fab & Fix multipoint door locks.
Delivery & Returns

How much is delivery?

UK Mainland Delivery is £2.99 on all items no matter how many you order!

Northern Ireland, Scottish Highlands, Channel Islands £6.00.

We do not offer International Delivery (Ireland, France, Spain etc).

When will my order be dispatched?

Orders before 3pm (Monday to Friday) are usually dispatched same day but may take up to 24 hours.

When will I receive my item?

We ship on 2 working day courier. Fully Tracked. Tracking will be emailed on dispatch. 

Special order items such as keyed alike locks will take longer to dispatch. Please refer to product description for lead times. 

I haven't received my item?

Please email us your name, order number and date of purchase.

We prefer email as it allows us time to research and respond.

Returns Information

We operate a 30 day refunds and return policy. 

If you change your mind you must return the product back to us within 30 days of delivery

Please include a copy of your invoice and a note stating reason for return. 

Additional keys, locks keyed alike or built to code are non refundable as they are personalised made to order goods.

Any refund, which is due to a fault or other defect, will include a refund of the applicable delivery charges otherwise not. 

It is the buyers responsibility to arrange the return of goods to us. We do not offer a collection service for returning items. 

Items must be returned including original product packaging and accessories.

We reserve the right to refuse any returns that do not comply with this policy.

Please post returns to the following address:

Home Secure (Online)

Unit 5, Brookfield Drive

Liverpool, L9 7AJ

United Kingdom

Frequently Asked Questions

The ERA door lock centre case gearbox is the core component of a multipoint locking system, responsible for controlling the handle and key operation. It ensures all locking points engage properly, keeping your uPVC or composite door secure.

Common signs include a stiff or floppy handle, difficulty turning the key, or the door not locking securely. These issues often indicate internal wear and should be addressed quickly. Learn more in Beginners Guide to uPVC Door Locks.

No, not all gearboxes are universal. You must check measurements such as backset, PZ centres, and overall design to ensure compatibility with your existing multipoint locking system.

Yes, in many cases you can replace just the centre case gearbox instead of the entire multipoint lock. This is a cost-effective way to restore your door’s functionality without changing the full mechanism.

Ignoring a worn gearbox can lead to complete lock failure, making your door difficult or impossible to open or secure. Replacing it early helps maintain security and prevents emergency lockouts.