What Is a Shootbolt Lock? Complete Guide to Window Security

What Is a Shootbolt Lock? Complete Guide to Window Security

What is a shootbolt?

A shootbolt is a mechanical locking element commonly used in windows and doors to secure the sash to the frame or to the adjacent sash. Unlike a standard latch, a shootbolt moves vertically or horizontally into a keeper or socket; the bolt "shoots" out when the lock is engaged. Shootbolts are often part of multipoint locking systems such as espagnolette gear, and they provide added resistance to forced entry by locking the window at two or more points.

How a shootbolt works

Shootbolts are driven by a cam or rack-and-pinion inside the lockcase or by a separate actuator rod. When the handle is turned or the locking mechanism is operated, the drive converts rotational motion into linear travel of the bolt. Typical throws are 10 to 20 mm, depending on the product. The bolt locates into a keeper machined into the frame or fitted as a surface-mounted plate. For French doors and some casements there will be a top and bottom shootbolt providing secure contact at two ends of the sash.

Types of shootbolts

• Integral shootbolts: built into the multipoint gearbox; operate with the main handle
• Remote shootbolts: separate rods that are operated by an espagnolette or lever, useful for tall sashes
• Surface-mounted shootbolts: fitted to the sash or meeting stile when a mortice is impractical
• Drop bolts: similar function but drop vertically into a socket in the cill or head
• Stainless or coastal-finish shootbolts: designed for high-corrosion environments

Where shootbolts are used

Shootbolts are common in uPVC, aluminium and timber windows and doors across the UK. Typical applications include:

• French and patio doors: to secure the inactive leaf at top and bottom
• Casement windows: to add top and bottom locking points for improved rigidity
• Tilt-and-turn windows: to achieve multiple locking points for weather and security
• Timber joinery where a morticed keeper is preferred for appearance

Practical trade advice for choosing the right shootbolt

When specifying or fitting shootbolts consider the following technical points:

• Backset and cut-out: ensure the shootbolt matches the sash profile and the lockcase cut-out; incorrect backset will require faceplate modification
• Bolt throw: choose a throw sufficient to engage deep into the keeper for secure seating; 12 mm is common but check product datasheets
• Keeper type: decide between a recessed keeper for a neat finish or a surface-mounted keeper for easier retrofit
• Material and finish: stainless steel or marine-grade finishes are essential in coastal locations
• Compliance: select gear that meets relevant standards such as BS/EN performance requirements and, where applicable, PAS 24 or Secured by Design recommendations
• Compatibility: if replacing part of an espagnolette system, match the gearbox centreline and hook geometry to avoid binding

DIY installation and trade fitting tips

For competent DIYers and trade fitters the following steps will help achieve a secure install. Always follow the manufacturer’s instructions and safety guidance.

• Preparation: remove the sash and label components so they return to the correct location
• Marking: close the sash fully and mark the keeper positions by operating the shootbolt and transferring the location to the frame
• Milling: where a recessed keeper is required, use a router or chisel to create a neat mortice; set depth carefully to avoid weakening the frame
• Drilling: pilot-drill screw holes for the keeper and ensure fixings are into dense timber or reinforced zones in aluminium/uPVC
• Adjustment: fit the shootbolt and adjust keepers in small increments; allow 1 to 2 mm clearance for smooth engagement when seals compress
• Testing: cycle the lock multiple times and check operation with the window closed and under slight pressure to imitate weather seals

Maintenance and common faults

Regular maintenance keeps shootbolts functioning and extends product life. Recommended actions include:

• Lubrication: use a graphite or light machine oil on the moving parts annually; avoid heavy grease that attracts dust
• Cleaning: remove debris from keepers and channels; salt deposits in coastal areas should be rinsed away
• Check fixings: tighten screws and replace any that have pulled out; consider longer or reinforced screws where timber has degraded
• Alignment wear: if shootbolts begin to bind, inspect for sash sag or frame movement; adjusting hinge or refurbishing keepers often solves the issue

Security considerations and upgrades

Shootbolts are a strong element in a security strategy but must be part of a complete system. For higher security levels consider:

• Multipoint locking with anti-lift hooks and deadbolts for improved resistance
• Reinforced keepers and security plates to prevent forced entry around the keeper area
• Anti-snap and high-security cylinders on combined systems
• Meeting Secured by Design specification where required for insurance or commercial projects

For more detail on related hardware and gearbox options, see our pillar page on espagnolette window locks.

Recommended Products

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

• ERAB Espagnolette Window Lock Universal Lock Replacement
• Avocet Slimline Offset Window Espag
• Multipoint Gearbox GU Old Style
• Patio Door Handle Set - 92PZ White
• Winlock Patio Door Handle Set

Conclusion and next steps

Shootbolts provide robust, reliable locking at multiple points and are a valuable component in modern window and door security. For tradespeople specify the correct throw, material and keeper type; for DIYers follow careful marking, milling and adjustment procedures. If you are unsure about compatibility with existing gear or require a higher security solution, contact a specialist supplier or arrange a site survey. Next steps: check product datasheets for throw and backset, inspect existing keepers, and consider upgrading to stainless or reinforced components in exposed locations.