How to Replace a Shootbolt on uPVC Windows

How to Replace a Shootbolt on uPVC Windows

Shootbolts are the top and bottom locking bolts on many uPVC casement windows that work alongside an espagnolette multipoint mechanism to provide secure engagement into the frame keeps. Worn, broken or seized shootbolts will compromise security and operation. This article explains how to identify, remove and replace shootbolts on uPVC windows, with practical trade advice and DIY guidance for both homeowners and installers.

Tools, parts and materials you will need

• Screwdriver set: pozidriv sizes 1 to 3 and a small flat screwdriver
• Hex keys/Allen set for some espagnolette locking cams
• Pliers and long-nose pliers
• Thin utility knife
• PTFE / silicone grease for lubrication
• Replacement shootbolt kit or complete espagnolette if the gearbox is damaged
• Replacement keeps/striker plates if bolts do not engage
• Measuring tape and digital calipers for accurate sizing
• Safety gloves and eye protection

Diagnose the problem before you start

Not every sticking or non-engaging bolt requires full replacement. Do these checks first:

• Operate the handle through its full travel to see whether the shootbolt moves freely or is partially seized.
• Look at the shootbolt heads for wear or breakage; common signs are rounded edges or fractured tips.
• Inspect the keeps on the frame for deformation or incorrect alignment; misaligned keeps can give the impression of a failed bolt.
• Check for corrosion inside the sash where water ingress may have occurred; heavy corrosion usually means replacing the whole espagnolette mechanism.
• Note the make and any stamped part numbers on the existing espagnolette; these help when ordering parts.

Preparation and safety

Work on windows with the sash supported. If the window is large, consider removing the sash from its hinges and lay it on a soft, flat surface. Always wear eye protection when working with metal components and gloves when handling old, sharp parts. Take photographs during disassembly for reference during reassembly.

Step-by-step: replacing the shootbolt

The exact procedure depends on whether the shootbolt is a replaceable cartridge within the espagnolette or an integral part of the gear. The following steps cover both scenarios.

1. Remove handle and access cover

• Unlock and open the sash slightly so you can reach the handle. Remove the handle by taking out its fixing screws; these are normally under a cover cap.
• Remove the sash cover strip or the escutcheon to expose the espagnolette. Small plastic caps clip into place; gently prise them off with a flat screwdriver.

2. Free the mechanism

• If the shootbolts are obstructing removal, move the handle to the unlocked position so bolts retract where possible.
• Unscrew the espagnolette faceplate fixings. Some systems have additional fixings behind friction plates; remove these carefully and keep all screws in order.

3a. Replace a modular shootbolt

• Some modern systems have modular shootbolt cartridges that slide out from the top or bottom of the espagnolette. Remove the retaining clip or screw and slide out the old bolt.
• Fit the replacement cartridge ensuring the orientation matches; lubricate moving surfaces with PTFE grease before sliding into place.
• Secure the retaining clip or screw and manually operate the handle to check movement.

3b. Replace an integral shootbolt or whole espagnolette

• If the bolts are welded or integral to the gear, remove the entire espagnolette from the sash. Carefully withdraw it from the top and bottom channels.
• Measure the new replacement espagnolette against the old one: overall length, centre backset and position of shootbolt heads. Ordering by window maker number is safest where available.
• Install the new espagnolette in the reverse order; ensure the gearbox aligns with the handle spindle and that top and bottom bolts slide into their guides.

4. Realign keeps and test operation

• Before fully tightening, close the sash and operate the handle several times to ensure the shootbolts meet the keeps correctly; bolts should enter the keeps without forcing the sash.
• If engagement is sloppy, adjust the keeps up or down or use the adjustable keeps supplied. Small packing shims behind keeps often fix alignment issues quickly.
• Check compression and sash closing; if the sash binds, recheck hinge packers rather than modifying the espagnolette.

Common problems and practical trade tips

• Seized shootbolt: use PTFE spray to free a slightly stuck bolt; persistent seizure usually requires replacement of the cartridge or the entire espagnolette.
• Wrong handed part: measure the orientation before ordering; some shootbolts are handed left or right and will not fit reversed.
• Damaged keeps: replace keeps rather than filing the frame; new keeps improve security and extend component life.
• Trade tip: keep a small stock of popular shootbolt cartridges and adjustable keeps for common window makes; this reduces return visits.
• When replacing parts during an upgrade to improve security: consider a full multipoint replacement if the gearbox shows wear, as this ensures matched gear and consistent operation.

Maintenance after replacement

Lubricate shootbolts and the espagnolette with a dry PTFE or silicone-based lubricant every 12 months. Avoid oil-based products for long-term lubrication. Check screws for tightness and re-torque after a few weeks of use. Advise the homeowner to operate the window monthly to prevent components seizing.

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
• In-Line Window Mechanism
• Offset Window Mechanism

Conclusion and next steps

Replacing a shootbolt on a uPVC window is a straightforward task if the fault is limited to the bolt or cartridge; replacing the whole espagnolette is recommended where the gearbox has corroded or the mechanism is badly worn. For accurate parts and technical specifications, note any stamped numbers and measure lengths carefully before ordering. For further technical background on espagnolette systems and choosing the correct multipoint lock, see our pillar page: /guides/espagnolette-window-locks.

If you are unsure whether to replace a single shootbolt or the whole unit, contact our trade support team with photographs and measurements; we can advise on part numbers and supply trade-grade replacements to get the job finished right first time.