Replacement Double Glazed Window Handles: Espag vs Cockspur

Replacement double glazed window handles are a common upgrade for improving security, functionality and appearance of uPVC and aluminium windows. Choosing between espagnolette (espag) handles and cockspur handles requires understanding their mechanisms, suitability for different window types, and simple steps for measurement and fitting. This guide offers practical, actionable advice for homeowners and tradespeople aiming to select and install the correct replacement double glazed window handles.

Espag vs cockspur: basic differences

Espag handles operate a multi-point locking mechanism via an internal gearbox and a long espagnolette arm (the espag). Turning the handle rotates the gearbox which moves the actuator arm to engage locking points along the frame. Espag handles are commonly used on casement windows where a secure multi-point lock is required.

Cockspur handles, by contrast, are surface-mounted. The handle forces a hooked spur against the window frame when turned, creating a single-point lock. Cockspur handles are simpler mechanically and are often found on older or budget double glazed windows.

Both types serve the same purpose of locking and operating windows, but they suit different hardware and security requirements.

When to choose an espag handle

Espag handles are ideal when security and smooth operation are priorities. They are compatible with multi-point espagnolette locking systems, providing better resistance to forced entry than single-point cockspur locks. Typical reasons to choose an espag handle:

• The existing window uses an espagnolette locking mechanism or the strike plates show multiple engaging points.
• A higher security rating is desired, such as for ground-floor rooms or properties in higher-risk areas.
• A cleaner aesthetic is preferred, as espag handles sit flush against the frame and conceal the locking arm.

A widely used option is the TSS Cockspur Window Handles, which offers a robust gearbox and secure fitting for modern uPVC windows. When selecting an espag replacement, check the centre distance (the measurement between the handle spindle and the top screw) and the espagnolette arm length and position.

When to choose a cockspur handle

Cockspur handles suit windows where the locking mechanism is surface-mounted and the frame cannot accommodate an espagnolette arm. Situations favouring cockspur handles include:

• Older double glazed units with existing cockspur locks.
• Timber or slim-profile frames where internal locking rods are not possible.
• A quick, cost-effective replacement is needed without changing the existing lock keepers.

The TSS Cockspur Window Handle is a reliable replacement option for many traditional double glazed windows. When fitting cockspur handles, ensure the spur engages fully with the frame and that the handle alignment prevents wedging when closing.

Measuring for the correct replacement

Accurate measurement prevents buying the wrong part. Key measurements for replacement double glazed window handles:

• Backset or centre distance: For espag handles, measure from the base of the handle spindle to the top screw (or to the centre of the gearbox) — commonly 22mm or 28mm in the UK.
• Espagnolette arm length and orientation: Measure the length of the arm from the gearbox to the tip and note whether it is straight, angled or has a mushroom end.
• Fixing hole centres: Measure the distance between screw holes on the handle rose to match mounting plates.
• Spur projection: For cockspur handles, measure how far the spur needs to reach into the frame or rebate to engage reliably.

Record measurements in millimetres and take a clear photo of the existing handle and locking mechanism; tradespeople will appreciate the visual reference.

Practical fitting tips

• Remove the handle gently: For espag units, retract the handle and remove the rose screws; for cockspur handles, undo the rose screws and lift off the handle assembly.
• Check the gearbox and mechanism: If an espag gearbox is worn, a handle replacement alone may not restore smooth function; consider replacing the gearbox or the entire espagnolette strip.
• Use the correct spindle length: A spindle that is too short results in a loose handle, too long can prevent full closing. Standard spindles are 7mm or 8mm square — verify before purchasing.
• Lubricate moving parts: Apply a small amount of silicone spray or light machine oil to the gearbox and sliding parts to improve operation and extend life.
• Secure fixing screws firmly: Over-tightening can strip plastic frames; tighten until snug with a final small turn.
• Test the operation several times: Confirm the handle fully engages the lock and the window closes flush without binding.

Security and compliance considerations

Replacement double glazed window handles should enhance security, not reduce it. For ground-floor windows, use handles with key-locking functions or choose handles compatible with multi-point locking systems. Espag handles often pair with reinforced espagnolette strips and keeps for improved resistance. For trade installations, follow relevant British Standards and manufacturer instructions to maintain any warranty or insurance compliance.

Maintenance and longevity

Regular maintenance prolongs life: clean handles with a mild detergent, avoid abrasive cleaners, and inspect fixings annually. Replace handles that show play, difficulty turning, or rust. For properties in coastal areas, choose corrosion-resistant finishes or stainless-steel components to resist salt air.

Final selection checklist

• Confirm current mechanism: espag or cockspur.
• Measure centre distance, arm length and fixing holes.
• Choose a handle that matches finish and spindle size.
• Consider a key-locking variant for added security.
• Fit with appropriate lubricants and torque on fixings.

For modern espag replacements, the TSS Offset UPVC Window Handles provides a trusted brand option with good durability and finish. Proper selection and fitting ensure replacement double glazed window handles deliver secure, smooth operation and a tidy appearance.

Window Handles Guide