Window Handle Sizes: Explained Spindle Length Screw Centres Handing

Window handles are small, everyday fittings that have a big impact on security, weather performance and ease of use. Whether you are replacing a broken handle, upgrading to a more secure option or specifying hardware for new windows, this guide covers practical, actionable advice on choosing, fitting and maintaining window handles.

Why choosing the right window handles matters

Good window handles do three things well: they allow smooth operation, contribute to security and match the type of window and locking mechanism. Poorly chosen handles can cause frustrated users, premature wear of window mechanisms and reduced security.

Key considerations when selecting window handles:

Compatibility with the window type (casement, top-hung, tilt-and-turn, sliding)

Whether the handle is for timber, aluminium or uPVC

Locking features and cylinder compatibility

Aesthetic and finish

The following sections explain how to assess these factors and list compatible products and parts you might need.

Types of window handles and common uses

Espag (espagnolette) handles

Espag handles are common on uPVC and aluminium casement windows. They operate a spindle that engages multipoint locking within the frame. If your window uses an espag mechanism, choose an espag-compatible handle such as the Avocet Slimline Offset Window Espag. This type offers a slim profile and is available in different offsets to match gearbox positions.

Practical tip: Measure the distance from the screw centres and the spindle size before ordering replacement espag handles.

Cockspur handles

Cockspur handles are often found on older uPVC windows; they clamp over the window frame when turned. The TSS Cockspur Window Handles are a standard choice for like-for-like replacements.

Practical tip: If your window sash or frame has degraded, cockspur handles can still be used but may not deliver modern levels of weather sealing or security.

Offset handles for uPVC

Offset handles, such as the TSS Offset UPVC Window Handles, are designed to clear beading or profiles that a straight handle would hit. They are often used where the handle needs to sit away from the glass or the window line.

Practical tip: Check the offset dimension on the replacement handle to ensure clearance with the beading.

Thumb-turn cylinders and keyed handles

For rooms where quick egress is important, or to add supplementary security, consider handles that accept euro cylinders or thumb-turn cylinders. The TL Thumb Turn Euro Cylinder and the Ultion Plus TS007 3* Kitemarked Euro Key & Turn Cylinder are examples of secure cylinder options.

Practical tip: For all external accessible windows, use a kitemarked cylinder rated to the desired security level and ensure the handle or escutcheon is cylinder-compatible.

Matching handles to window mechanisms and parts

Handles rarely work in isolation. When replacing a handle, check related components and consider replacing worn parts at the same time for best results.

Gearbox / espagnolette: If the window feels loose or the lock does not engage correctly, inspect the in-line window mechanism such as the In-Line Window Mechanism.

Hinges: Faulty hinges can put extra strain on handles. For top-hung windows, check the Top-Hung Window Hinge - Standard; for doors or larger sashes, inspect relevant hinges such as the Flag Door Hinge - Stainless Steel.

Gaskets: Worn seals affect weather performance; replace with suitable bubble gaskets such as the B003 Bubble Gasket or B004 Bubble Gasket.

Practical checklist before ordering a replacement handle:

Identify window type (casement, top-hung, tilt-and-turn, sash).

Measure screw hole centres and spindle size/shape.

Note whether a keyed cylinder or thumb turn is required.

Inspect related hardware (espagnolette, hinges, gaskets).

Choose a handle with the correct offset and finish.

How to replace a window handle: step-by-step

These steps cover most casement and uPVC window handle replacements. Always check the manufacturer instructions for your particular handle.

Tools required: screwdriver set, hex key set, tape measure, replacement handle and any new screws.

Open the window and locate the handle fixation screws; some handles have them on the face, others hidden under a cover plate.

Remove the fixation screws and slide the handle off the spindle. Keep old screws if they are in good condition, otherwise replace them.

Inspect the spindle for wear and measure its cross-section (square, D-shaped) and length. Replace the spindle if damaged.

Fit the new handle onto the spindle ensuring it sits flush. Align the screw holes and tighten evenly to avoid bending the spindle.

Test operation: the handle should move smoothly through the locking positions and the lock should engage reliably.

If the handle is keyed or uses a cylinder, test locking and unlocking from both sides. If upgrading the cylinder, fit the Ultion Plus TS007 or TL Thumb Turn as required.

Safety note: If the window is large or in a vulnerable position, work with a second person to secure the sash during replacement.

Improving security with handle and cylinder upgrades

Upgrading handles alone can improve convenience, but combining a secure handle with a kitemarked euro cylinder greatly improves security. Consider these steps:

Fit a 3-star kitemarked cylinder such as the Ultion Plus TS007 for high-security sites.

Use handles that incorporate anti-drill or anti-snap features where appropriate.

Ensure the handle backplate protects the cylinder from forced removal or drilling.

Practical tip: When replacing a cylinder, measure the existing cylinder lengths from centre to end to get the correct size. Many cylinders are asymmetric; fit the correct orientation so the thumb-turn or key sits in the right position.

Maintenance tips to extend handle life

Regular simple maintenance keeps window handles working well:

Clean handles and hinges periodically with a mild detergent; avoid abrasive cleaners.

Lubricate moving parts annually with a light oil or a dry PTFE spray on the gearbox and spindle; do not over-lubricate gaskets.

Check screw tightness once or twice a year and re-tighten if the handle has become loose.

Replace worn gaskets like the B003 or B004 Bubble Gasket to maintain weatherproofing.

When to call a professional

Consider a professional if:

The window sash is warped or misaligned after handle replacement.

You suspect the espagnolette or in-line mechanism needs major repair.

You are upgrading security across multiple windows and require cylinder masterkeying or coded access.

A professional installer can also ensure correct torque and alignment for high-use windows, preventing long-term wear.

Related Reading

Explore more guides on related topics:

• Window Stay Maintenance: Keeping Your Hardware Working
• Egress Hinge

Summary

Choosing the right window handles requires attention to window type, spindle and screw dimensions, offset and cylinder compatibility. Pairing good handles with compatible mechanisms such as the In-Line Window Mechanism, quality hinges and seals like the B003 or B004 Bubble Gasket, and secure cylinders such as the Ultion Plus TS007 improves performance and security. Follow the practical fitting and maintenance steps above to ensure smooth operation and long service life.

Further reading and products mentioned:

In-Line Window Mechanism

Top-Hung Window Hinge - Standard

B003 Bubble Gasket

TL Thumb Turn Euro Cylinder

TSS Cockspur Window Handles

Avocet Slimline Offset Window Espag

Flag Door Hinge - Stainless Steel

TSS Offset UPVC Window Handles

B004 Bubble Gasket

Ultion Plus TS007 3* Kitemarked Euro Key & Turn Cylinder

If you need help identifying the right handle for your window, provide photos of the handle and measurements and I can advise on a suitable replacement and the compatible parts to order.