Espag Window Handle Sizes: Spindle Length and Screw Centres

Espag window handles are a common choice for modern uPVC and aluminium casement windows, and selecting the correct spindle length and screw centres is essential for secure operation and a tidy finish. This guide explains how to measure, choose and fit espag handles, covering the typical sizes, common pitfalls and practical tips for both homeowners and tradespeople.

Understanding espag window handles and where measurements matter

An espag (or espagnolette) handle operates a multi-point locking gearbox with a square spindle. Two measurements determine compatibility: spindle length and screw centres. Spindle length is the distance the square shaft projects from the back of the handle into the gearbox; screw centres are the distance between the screw holes on the rose or baseplate that fix the handle to the frame. Both must match the window's existing gearbox and handle backplate to avoid misalignment, poor locking or excessive wear.

Common spindle lengths and when to use them

Standard spindle lengths for espag handles in the UK typically include 35mm, 40mm, 45mm, 50mm and 60mm. Thicker frames or certain gearboxes require longer spindles, while slim frames use shorter spindles. Tradespeople should always measure the existing spindle from the handle face to the gearbox centre or consult the window manufacturer for specifications when replacing handles on new installations.

A practical tip is to measure the spindle with the window closed and the handle removed. Use digital callipers for accuracy or a small ruler if necessary. When replacing a handle, round up rather than down if the existing spindle is slightly worn; a slightly longer spindle can usually be trimmed, but a spindle that is too short will prevent full engagement.

Screw centres: measuring and matching backplates

Screw centres are typically 43mm, 70mm, 90mm or 92mm for many espag handles and cockspur varieties. Measure from the centre of one fixing hole to the centre of the other. Surface-mounted roses and fixed backplates may have different centres, so confirm whether the handle is screw-through or rose-mounted. For screw-through handles, check that the screw heads will clear any internal handles, beading or seals when the window is closed.

Where older windows have non-standard fixing patterns, consider using a handle with a larger rose to cover previous drill holes or a matching spacer plate. Tradespeople working on refurbishment projects frequently carry an assortment of handles with varied screw centres for quick swaps.

Gearbox compatibility and backset considerations

Some espag gearboxes have a fixed backset (distance from the edge of the frame to the centre of the gearbox spindle), commonly 16mm, 20mm or 22mm. The handle design must allow the spindle to sit centrally in the gearbox; otherwise, the handle will be offset, possibly causing the locking mechanism to bind. When replacing handles following a failed gearbox, check whether the new handle requires a specific backset and choose accordingly.

For windows exhibiting stiff operation, inspect the gearbox and espagnolette rod as well as the handle. A worn gearbox can mimic handle problems; replacing both components together often gives the best long-term result.

Choosing the right handle style and finish

Function should take priority, but aesthetics matter too. For modern homes, users may prefer slimline espag handles in white, black or chrome satin finishes. For heritage or traditional windows, lever styles with ergonomic grips may be more appropriate. Durable finishes and anti-corrosion coatings are important for coastal properties where salt air accelerates wear.

Commercial-grade options such as the TSS Cockspur Window Handles offer enhanced security features and robust construction suitable for frequent use. For situations where cockspur handles are still specified, the TSS Cockspur Window Handle provides a reliable alternative for older casements.

Practical installation advice and common mistakes to avoid

• Always remove the handle and measure both spindle length and screw centres before ordering a replacement. Measuring from the gearbox face to the end of the spindle yields the most reliable spindle length.
• Do not force a handle onto a spindle that appears too tight; check for burrs, paint build-up or bent spindles. Carefully filing off burrs or replacing a deformed spindle prevents binding.
• Use the correct screws and torque. Over-tightening can deform the backplate and impede handle operation; under-tightening leads to wobble and accelerated wear.
• When replacing a handle on an older window, inspect the rubber seals and keep an eye out for rot or timber movement around fixing points. Re-sealing and reinforcing with longer fixings into sound material improves longevity.
• Test the handle through several locking cycles after installation to ensure smooth operation and full engagement of the locking points.

Spare parts, security and upgrades

Where security is a priority, consider handles with key-locking mechanisms or anti-snap features. Key-locking espag handles add a layer of deterrence for vulnerable properties. For a modern, secure option with solid build quality, consult products such as the TSS Offset UPVC Window Handles, which combines ease of use with recognised brand reliability.

Keep common spares in vans or toolkits: replacement spindles, a selection of handle types and fixings reduce downtime on site. For homeowners, retaining the original handle as a template can make future replacements straightforward.

Final checks and measurement checklist

Before ordering replacements, confirm the following:

• Accurate spindle length (measure from handle face to spindle end)
• Correct screw centres (centre-to-centre measurement)
• Backset and gearbox compatibility
• Desired finish and locking features
• Any special requirements such as reversible handles for left- or right-handed windows

Correct measurement and selection minimise callbacks and ensure smooth operation of espag window handles for years to come. Tradespeople who adhere to precise measuring techniques and carry a small stock of common sizes will find installations faster and more reliable.

Window Handles Guide