Best Fitch Fasteners for Sash Windows: 2025 Expert Review
DR Joinery
Expert Joiner & Restoration Specialist
If your sash windows rattle in the wind or let in a cold draught, the issue often isn't just the timber itself—it's the hardware. A proper fitch fastener does more than just lock the window; it acts as a clamp, pulling the meeting rails together to create a tight seal.
In my trade, I see far too many cheap fasteners made of brittle alloy that snap after a year, or designs that don't account for the movements of an old Victorian house. When we restore a window here in York, we look for fittings that offer both security and historical accuracy.
In this review, I've selected three fitch fasteners that I've encountered in my work: a budget-friendly option for quick updates, a solid brass heavy-weight for genuine restoration, and a locking narrow version for tricky, slim meeting rails.
Live in York?
Sash windows stuck, rotting, or rattling?
Our local team can restore them to their former glory.
Specs vs. The Real World
The Spec: "Security Claims"
"A fitch fastener locks the window securely against intruders."
Whilst a fitch provides a good seal, most insurance companies require a 'keyed' lock. A non-locking fitch might need additional sash stops or restrictors to meet your policy requirements.
The Spec: "Universal Fit"
"These fasteners fit any sash window."
Victorian joinery varies wildly. Many meeting rails (the horizontal bars that overlap) are very narrow. A standard fitch often overhangs, meaning you need a 'narrow style' fastener for a proper fit.
My Top 3 Recommendations
Three options to cover different needs and budgets
Enhance The Security and Elegance of Your sash Windows with This Narrow Style Fitch Sash Window Fastener
i IRONMONGERY SOLUTIONS
This is a decent 'narrow style' fastener ideal for slimmer sash rails where space is tight. The chrome finish suits more modern renovations or bathrooms where brass might tarnish too quickly. Ideally suited for those on a strict budget who need to stop a rattle.
The Good
- Very affordable price point
- Narrow profile fits slim Victorian meeting rails
- Chrome finish offers good corrosion resistance
The Bad
- Made of alloy rather than solid brass (less durable long-term)
- Chrome can look out of place in strict heritage conservation properties
Installer Tip:
Because this is an alloy construction, be careful not to overtighten the screws with a power drill, as the finish can crack. Always drill pilot holes first, especially in old, seasoned timber.
Priced at £7.99 at the time of writing
Check Price on AmazonPremium Quality AA40 Solid Fitch Pattern Sash Fastener + Screws (Polished Brass)
Carlisle Brass
Carlisle Brass is a trade staple we use frequently on restoration jobs. Made from solid brass, this fastener has a reassuring weight to it. It's a classic, non-locking design which looks historically accurate in older properties, though you may need extra locks for insurance.
The Good
- Solid brass construction will age beautifully
- Heavy-duty cam action pulls sashes tight together
- 10-year mechanical guarantee matches professional standards
The Bad
- Non-locking (may require reduced security insurance terms or extra locks)
- Requires polishing if you want to maintain the shine
Installer Tip:
When fitting solid brass onto oak or older softwood, use a steel screw to cut the thread first, then swap to the brass screws provided. Brass screws are soft and the heads can snap off easily if driven into hard timber without a pilot hole.
Priced at £14.99 at the time of writing
Check Price on AmazonNarrow Locking Fitch Fastener 65mm Polished Brass (2)
Jedo
This fastener solves two common headaches: narrow rails and insurance requirements. It features a locking grub screw mechanism, which satisfies most insurers requiring 'keyed' locks, whilst the narrow profile fits where chunkier fasteners won't.
The Good
- Locking mechanism helps meet insurance criteria
- Narrow plate ideal for slim meeting rails
- Excellent value (pack of 2)
The Bad
- Grub screw keys are small and easily lost—keep a spare safe
- Slightly fiddlier to operate daily than a non-locking version
Installer Tip:
Alignment is critical with locking fitch fasteners. If the meeting rails aren't flush, the locking arm won't engage smoothly. We often plane the meeting rails slightly during a restoration to ensure they sit perfectly level before screwing this down.
Priced at £12.92 at the time of writing
Check Price on AmazonFrequently Asked Questions
What is the difference between a Fitch fastener and a Brighton fastener?
Why won't my fitch fastener close properly?
Do I need a locking fitch fastener?
Can I replace these myself?
Need Professional Sash Window Restoration?
Our team at DR Joinery specialises in Sash Window Restoration across York.
Get a free quote for professional installation.
View Our Sash Window Restoration Service