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NWH-GU-OLD-30MM-CASE
GU Type Old Style 28/30mm Multipoint Centre Case Replacement
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GU old style multipoint centre door lock case only
In stock
Delivery Information
| Delivery Time Frame | Delivery Information |
| Next Working Day By 1PM | When an order is placed by 3pm for next working day on certain items |
| Standard Delivery | Usually delivered in 2 to 4 working days |
| Delivery Charges | |
| UK Mainland | Prices start at £3.95 for very small items, £6.50 for small, £9.50 for medium and £20 for large/long items |
| Scottish Highlands & Islands, Northern Ireland & Ireland | Prices from £30, please see our delivery page for more info. |
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£30.00
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£25.00
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Description
Door Hardware Repair
GU Type Old Style 28/30mm Multipoint Centre Case Replacement
Identifying a failing multipoint lock often feels like a significant hurdle for property maintenance, particularly when the main locking mechanism stops engaging properly. This GU type old style gearbox provides a direct, engineered solution for restoring the primary functionality of your door lock without the expense or physical effort required to replace the entire strip assembly inside your door profile.
We supply this high-performance replacement case to handle the specific operational demands of classic GU locking systems, which ensures your entry point remains secure and smooth to operate daily. By focusing on the centre case, you manage to save time during your site visit while providing your clients with a cost-effective repair that keeps original architectural components in place while restoring full security to their home or office environment.
28/30mm
ADJUSTABLE BACKSET
92mm
CENTRE TO SPINDLE
LIFT LEVER
OPERATION STYLE
SINGLE
SPINDLE TYPE
Why Choose the GU Type Old Style 28/30mm Multipoint Centre Case Replacement?
This replacement component simplifies the repair process for classic multipoint locks while maintaining original door performance.
Specific Legacy Compatibility
Designers engineered this unit specifically to suit the dimensions and mechanical requirements of older GU hardware systems. It fits where newer models often fail because the internal geometry matches the original factory specifications. This focus keeps your repair work tidy and prevents the need for extensive door modification or additional drilling on finished profiles.
Efficient Repair Workflow
Choosing to swap the gearbox rather than the full length strip reduces the time you spend on site significantly. You gain a practical advantage by keeping the existing locking points and hooks undisturbed within the door. This approach is highly appreciated by clients because it minimises disruption and lowers the overall cost of their maintenance task.
Variable Backset Adaptability
The unit handles both 28mm and 30mm configurations by accommodating the specific kink found on certain door strips. You get a versatile tool in your kit that covers two common setup scenarios in one package. This flexibility helps you complete the job confidently even when faced with minor variations in the existing door hardware setup.
Engineering Quality and Daily Performance
Precision manufacturing ensures that this replacement gear case delivers consistent tension and smooth handle operation over many years of service.
Internal Mechanism and Force Distribution
The internal cam and spring systems are constructed to manage the torque applied when lifting the lever to engage the locking hooks. You will notice the movement feels crisp and firm, which prevents the handle from drooping or feeling loose after installation. This balance of spring tension and gear movement is essential for long-term reliability in busy household entry doors.
High-quality metal components within the housing distribute stress evenly across the gear teeth when the key turns. This design prevents premature wear during heavy usage because the load is not concentrated on a single point. You are fitting a replacement that respects the original engineering intent of the GU system while benefiting from modern material processing standards.
Weather Resistance and Long-Term Finish
The exterior housing is coated with a protective finish that stands up against the internal moisture levels often found inside door cavities. This barrier prevents corrosion from building up on the critical moving parts, which keeps the mechanism sliding freely regardless of temperature changes. Reliability is kept high because the unit is protected from the elements that typically cause lock seizures.
Consistency in the plating process means the case sits snugly against the door faceplate without trapping debris or grit inside. You get a clean finish that integrates perfectly with the existing door hardware. This attention to build quality means your repair stays effective for the long haul, reducing the chance of a callback for the same issue next season.
Installation and Operational Workflow
Follow these practical steps to swap your old gearbox and restore secure locking for your door assembly.
1
Removal of Existing Case
Start by removing the handle set and cylinder from the door, then unscrew the long faceplate strip from the door frame edge. Carefully extract the central gearbox from the door cavity while ensuring you note the orientation of the strip connections, as this provides a clear guide for the upcoming reattachment of the new unit.
2
Latching and Alignment
Position the new gearbox on the strip and ensure the latch mechanism is aligned correctly for your door opening direction. You can reverse the latch easily by pushing it clear of the faceplate and twisting it, which allows it to seat perfectly before you secure the screws back into the door frame channel tightly.
3
Functional Verification
Test the lift-lever action and the key turn before closing the door to confirm the hooks engage smoothly without binding. Once you are satisfied that the movement is fluid and the bolt projection is full, reattach the handle furniture and decorative covers to complete the repair with a clean and professional aesthetic finish.
Expert Installation and Care Tip
Apply a small amount of light silicone-based grease to the moving parts of the gearbox before mounting to ensure silky operation for years to come. Always ensure the door is properly aligned in the frame before testing the lock, as binding caused by door drop can stress the new gear teeth unnecessarily.
Technical Specifications
| Feature | Rating / Standard | Practical Details |
|---|---|---|
| Backset Distance | 28mm / 30mm | Fits both sizes depending on the specific strip kink profile. |
| Spindle Centres | 92mm | Industry standard measurement for GU lift-lever lock systems. |
| Operation Method | Lift Lever | Requires upward handle movement to throw the locking bolts. |
| Spindle Quantity | Single Spindle | Commonly found on residential doors with one handle set. |
Longevity and Trade Reliability
This replacement part is designed to meet the rigorous demands of professional door maintenance. By focusing on precision tolerances, it provides a dependable, high-value repair that maintains the integrity of the door assembly for many years.
Compatibility and Fitting Notes
This centre case is strictly for old style GU locks and will not function with modern current-production GU models.
Verify your current backset measurement carefully by measuring from the edge of the faceplate to the centre of the spindle hole.
Check if your door strip has a 2mm inward kink which turns the effective backset into 28mm for a perfect fit.
Specification
| Manufacturer | GU |
|---|---|
| Guarantee | 12 Months |
| Lock Type | Multipoint |
| Lock Operation | Euro Cylinder |
| Lock Backset | 28/30mm |
| Lock Centres | 92mm |
| Follower Size (mm) | 8 |
| Environmental Suitability | Indoor & Outdoor |
| Mechanism | Case Only |
| Door Material Suitability | UPVC / Timber |
| Max Door Thickness (mm) | 65 |
| Forend Finish | Stainless Steel |