How to Replace Friction Hinges on uPVC Windows

How to Replace Friction Hinges on uPVC Windows

Overview

Friction hinges are the most common operating mechanism on uPVC casement windows in the UK. They allow a window to open and hold at any angle without a stay; friction between the hinge arms provides controlled resistance. Over time the hinge friction can fail, the pivot bushes can wear, or the fixings can corrode. Replacing a faulty friction hinge is a routine trade job that a competent DIYer can complete with the right tools and parts. This post covers identification, practical trade advice and a safe step-by-step replacement process for both homeowners and installers.

Tools and materials

• Screwdrivers: Pozidriv and flat head
• Hex keys or Allen set for friction adjustment screws
• Torx bits if required by the hinge manufacturer
• Drill and screwdriver bits for removal and refitting
• Replacement friction hinge: correct handing and length
• Replacement screws (stainless steel or zinc plated) and frame fixings
• Wood or plastic wedges to support the sash
• Lightweight grease or specialist window lubricant
• Safety gloves and eye protection
• Silicone sealant or touch-up materials for any disturbed seals

Identifying the correct replacement friction hinge

Before you remove anything, identify the hinge type and handing. Look at the hinge when the window is closed and you are standing inside: hinges on the left are left-handed and hinges on the right are right-handed. Confirm whether the hinge is top-hung or side-hung and whether it is a standard friction hinge, a stay-assisted hinge, or part of a restrictor system.

Measure the hinge length and note the faceplate hole spacing. If possible, get the manufacturer and part number; many uPVC systems use branded hardware where direct replacements are best. If the manufacturer cannot be identified, measure the overall arm length and the distances between fixing holes; this will help you match a compatible friction hinge. Check the load rating and recommended sash weights on the datasheet; mismatching a hinge can lead to premature failure.

Step-by-step replacement

Follow these steps for a safe, effective replacement. For larger windows use two people to support the sash.

• Prepare the site: open the window fully so you have clear access to the hinges. Use wedges between the sash and frame to support the sash and prevent sudden movement.
• Isolate any locks or handles: operate the handle to the unlock position so the sash can be moved freely. If the window has restrictors, release them according to the manufacturer instructions.
• Loosen the friction adjustment on the hinge first; turn the adjustment screw anti-clockwise to reduce friction and make removal easier. Keep the adjustment screw accessible so you can fine-tune after fitting.
• Unscrew the sash-side fixings: remove the screws holding the hinge to the sash. Support the sash while you do this so it cannot fall or warp. On many systems the hinge will disengage from the sash arm when the screws are removed.
• Remove the frame-side screws: after the sash is free, unscrew the hinge from the frame or the hinge keep. If the hinge is attached to a steel backplate or keeps, note their position and condition; replace if corroded or damaged.
• Prepare the new hinge: compare it to the old hinge to confirm match. Transfer any keeps or cover plates if required. Apply a small amount of suitable lubricant to the pivot areas but avoid over-greasing; friction hinges rely on controlled resistance.
• Fit the hinge to the frame first: align the hinge and secure the frame fixings loosely. Then offer the sash into position and fix the sash-side screws. Tighten all fixings progressively so the sash remains square.
• Adjust alignment: tighten the frame and sash screws, but leave micro-adjustments for the hinge adjustment screws. Open and close the window several times to check smooth operation; adjust friction by turning the adjustment screw clockwise to increase resistance or anti-clockwise to reduce it.
• Final checks: ensure the window closes to the keep and engages the locking points correctly. Check seals are intact and re-seal if any sealant has been disturbed. Confirm restrictors and limiters operate if fitted.

Adjustment, testing and maintenance

A properly fitted friction hinge should allow the sash to stay at any angle without drifting. Adjust the friction incrementally; small changes can make a big difference. After adjustment perform these checks: open the window to several angles to confirm it holds, test multi-point locking if present, and ensure the sash sits square in the frame when closed.

For ongoing maintenance: lubricate pivot points annually with a light silicone or specialist window lubricant; avoid heavy greases that can attract dirt. Inspect screws and keeps for corrosion and re-tighten as required. If one hinge is worn, replace both hinges on the same side to ensure even load distribution; mismatched hinges can cause racking and premature wear.

Common problems and trade tips

• Stripped or damaged screw threads: use a longer or slightly larger diameter stainless screw if the uPVC profile allows; alternatively fit a plastic or metal insert to regain a secure fixing.
• Incorrect handing or length: if the hinge does not sit flush or the sash does not close squarely, double-check handing and hole spacing; do not force fit. A poor match will result in poor operation and increased wear.
• Corroded keeps: replace corroded keeps or upgrade to stainless options. Corroded keeps cause misalignment and can lead to failed locking points.
• Single-sided replacement: always consider replacing both hinges on the same side, or both sides for older windows; this spreads load evenly and reduces callbacks.
• Document part numbers and measurements: tradespeople should record hinge part numbers, faceplate hole centres and arm lengths; this speeds up future orders and reduces waste.

Recommended Products

Based on this article, you may find these products helpful:

• Top-Hung Window Hinge - Standard
• Side-Hung Window Hinge - Standard
• Top Hung Friction Stay - 12"
• In-Line Window Mechanism
• Offset Window Mechanism

Conclusion and next steps

Replacing a friction hinge on a uPVC window is a task within reach for competent DIYers and a routine job for tradespeople. Key points are to identify the correct hinge, support the sash during work, adjust friction correctly and test thoroughly. If you are unsure about handing or load ratings, or the frame fixings are damaged, consult a specialist. For further technical details and product options visit our pillar guide on window hinges at /guides/window-hinges or contact our trade counter for part numbers, datasheets and stainless steel options.