Locking Window Handles: Espag and Cockspur Options

Locking window handles provide a simple but effective upgrade to household security, improve child safety and can reduce draughts when windows are closed. This article explains the main types available for casement and pivot windows — with a focus on espagnolette (espag) and cockspur styles — and offers practical, actionable advice on selection, installation and maintenance for homeowners and tradespeople.

Why choose locking window handles

Locking window handles deter opportunistic burglary by making windows harder to open from the outside. They also prevent accidental opening by children and can maintain a tighter seal to improve thermal performance. For many installations, replacing a non-locking handle with a locking version is a low-cost way to boost security without changing the window frame or glass.

Choosing the right style depends on the window hardware already fitted and the level of security required. Two common options are espag handles, which operate an espagnolette multi-point locking mechanism, and cockspur handles, which engage directly with keeps on the frame.

Espag (espagnolette) locking window handles

Espag handles connect to a metal locking bar (the espagnolette) running vertically within the window edge. Turning the handle retracts or engages the locking bar at multiple points, giving superior security and compression.

Benefits:

• Multi-point locking increases resistance to forced entry.
• Produces a tight seal that reduces draughts and improves insulation.
• Many models offer key-locking for added security.

Installation and compatibility:

• Confirm the handle spindle size (commonly 7mm or 8mm) and hole centres before ordering.
• Espag handles are suitable for uPVC, aluminium and timber windows fitted with espagnolette straps.
• When replacing an existing handle, note the screw spacing and backset; mismatches may require a new lock case or converter.

Practical tips for tradespeople:

• Use a square-shanked spindle measurement tool to ensure correct fit; test the spindle in the existing gearbox before final fitting.
• Where the espagnolette strap is corroded or bent, replace the strap or the entire gearbox to maintain proper locking action.
• For older windows, choose a handle with a longer spindle to accommodate thicker frames.

A high-security option to consider is the TSS Cockspur Window Handles, which offers enhanced locking cam geometry and durable finishes suitable for high-traffic properties.

Cockspur locking window handles

Cockspur handles are surface-mounted and work by the handle turning a hook (cockspur) against a keep on the window frame. They are widely used on older uPVC and metal-framed windows and remain a cost-effective choice for many households.

Benefits:

• Simple retrofits to many existing windows without altering the frame.
• Generally lower cost than espag systems.
• Surface mounting makes them quick to replace.

Installation and compatibility:

• Measure the handle projection and ensure the keep on the frame lines up correctly; misalignment reduces effectiveness.
• Choose handles with a key-lock for added security when the window cannot be fitted with a multi-point system.
• Cockspur handles are not suited to windows requiring a compressed seal like modern espag systems; they are best for low-traffic or secondary rooms.

Practical tips for tradespeople:

• Check that the screw threads in the frame are sound; replace with coach bolts or rawl plugs in soft frames.
• If the original keep is damaged, fit a reinforced keep or backplate to distribute the load and prevent frame damage.
• Lubricate the pivot points with a light silicone spray to maintain smooth action without attracting dust.

A recommended cockspur option is the TSS Cockspur Window Handle, which balances affordability with reliable operation for standard installations.

Key features to look for

When selecting locking window handles, prioritise the following features:

• Security rating and whether the handle locks with a key or push-button.
• Corrosion-resistant finishes for coastal locations (e.g., stainless steel or specially treated coatings).
• Spindle length and diameter to match the existing gearbox or keeps.
• Backset and screw-hole spacing for ease of replacement.
• Handle orientation (left or right handed) for correct operation; reversible models reduce ordering errors.

For a mainstream locking handle that suits many modern windows, the TSS Offset UPVC Window Handles is a widely used option combining security and a neutral aesthetic.

Installation and maintenance best practice

Actionable installation steps: 1. Remove the old handle: unscrew securely and extract the spindle, keeping any original screws or fixings for reference. 2. Measure the spindle length and diameter, and the distance between fixing holes. 3. Dry-fit the new handle to check alignment with the gearbox or keeps before tightening screws. 4. Check operation by opening/closing and engaging the lock several times; adjust keeps or screw positions if binding occurs. 5. For key-locking handles, ensure the key turns freely when the window is closed and locked.

Maintenance tips:

• Clean with a mild detergent and soft cloth; avoid abrasive chemicals that damage finishes.
• Lubricate moving parts annually with light machine oil or a silicone spray to prevent stiffness.
• Replace handles showing corrosion, cracked plastics or loose spindles to avoid failure during use.
• For rental properties, keep spare keys securely labelled and log any replacements for tenant safety.

Choosing the right solution

Match the handle type to the window’s locking mechanism and the desired security level. Espag systems are preferred where security and insulation are priorities, while cockspur handles remain practical for quick retrofits and older frames. Tradespeople should carry a small range of spindles, screws and keeps to handle most on-site replacements efficiently.

For further reading on styles, measurements and troubleshooting, consult the comprehensive Window Handles Guide.

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