Three metal door lock center cases with gearboxes, displayed horizontally, with visible screws 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.
Three metal door lock center cases with gearboxes, displayed horizontally, with visible screws 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.
ERA

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

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£39.99 £29.99 Sale SKU: HS2832
Order by 2pm for same-day dispatch
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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 before ordering.

Key benefits
  • Replaces ERA Saracen Surelock - 35mm backset, 92mm PZ
  • Hook bolt + deadbolt - restores multipoint lock function
  • Standard ERA dimensions - measure your case before ordering
Product overview

ERA Replacement Gearbox with Hook

This ERA centre case gearbox features a hook mechanism and is a direct replacement for ERA, Saracen, Surelock, Laird and Fab & Fix multipoint door locks.

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 Backset and 92mm PZ.

This gearbox is non-handed, 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

An ERA centre case gearbox with hook is the main mechanism in a multi-point locking system that controls the latch, deadbolt, and hook locking points. The hook adds extra security by engaging deeper into the frame when locked.

A 35mm backset refers to the distance from the edge of the door to the centre of the spindle hole. This measurement is essential to ensure the gearbox fits correctly within your existing door setup.

Common signs include a stiff or loose handle, difficulty locking or unlocking the door, or the locking points not engaging properly. Ignoring these issues can lead to complete lock failure. Learn more in The Silent Door Failure: How a Worn Gearbox Can Lead to Complete Lock Breakdown.

No, this gearbox is specifically designed for ERA multi-point locking systems. Always check key measurements such as backset, fixing points, and lock configuration before purchasing.

Yes, with basic DIY knowledge, you can replace the gearbox by removing the door handles and lock strip. However, if you're unsure, it’s best to consult a professional to ensure proper installation.