Should I choose a locking or non-locking casement fastener?

Locking casement fasteners are recommended for ground-floor or easily accessible windows where extra security is required. Non-locking casement fasteners are often used on upper-floor windows where security risk is lower or where building regulations do not require key locking.

What is a night vent casement fastener?

A night vent casement fastener allows the window to be locked slightly open in a controlled position for background ventilation while still being secured. This is useful for bedrooms and living areas where you want airflow without fully opening the window.

Can I match my casement fasteners with window stays and other window furniture?

Yes, casement fasteners are available in matching styles and finishes to coordinate with casement window stays and other window furniture. Popular options include monkey tail, spoon end and bulb end designs in black, antique brass, polished chrome, satin nickel, pewter and beeswax finishes.

Which brands supply your casement window fasteners?

Our casement window fasteners are supplied by trusted UK brands such as Carlisle Brass, Heritage Brass, Frelan Hardware and From The Anvil, along with premium handcrafted manufacturers including Croft, Samuel Heath and Kirkpatrick.

Casement Window Fasteners

Q: What is a casement window fastener?

A casement window fastener is the handle and latch that secures a side-hung or top-hung casement window. It pulls the sash tight to the frame and can be supplied in locking or non-locking versions for timber and flush casement windows.

Q: What is the difference between hook, mortice and wedge plate casement fasteners?

Hook plate casement fasteners are ideal for flush frames, mortice plate fasteners are designed for recessed or stepped sashes, and wedge plate fasteners pull the window tight to the frame to improve draught sealing and security. Many casement fasteners include both hook and mortice plates for flexible installation.

Casement Window Fasteners – Hook, Mortice & Night Vent Options

Discover our range of casement window fasteners for timber and flush windows. Choose from hook, mortice, wedge or night vent styles in classic and modern finishes.

Locking and Non-Locking Casement Fasteners

Whether you need secure locking fasteners for ground-floor windows or non-locking options for upper floors, our range includes designs to suit any window type. Ideal for both traditional cottages and contemporary homes.

Hook, Mortice, Wedge & Night Vent Fitments Explained

Different windows require different fittings: Hook plate casement fasteners are ideal for flush frames. Mortice plate fasteners suit recessed or stepped sashes. Wedge plate fasteners pull the window tight to the frame for improved sealing. Night vent fasteners offer secure ventilation by locking the window slightly open.

Many fasteners come with both hook and mortice plates for flexible installation. Unsure which type you need? Visit our casement accessories collection or contact us for help.

Styles include monkey tail, spoon end, and bulb end fasteners. Popular finishes: black, antique brass, polished chrome, satin nickel, pewter, and beeswax. Each design pairs beautifully with our matching casement window stays.

Trusted UK suppliers include Carlisle Brass, Heritage Brass, Frelan, and From The Anvil, plus premium handcrafted brands like Croft, Samuel Heath, and Kirkpatrick.

Can’t find what you're looking for? Contact us here and we’ll be happy to help.

This is an image showing the Carlisle Brass M73 Casement Fasteners

Choose the Right Casement Fastener

Fitment Types, Styles & Finishes Explained

When shopping for casement window fasteners, it’s important to choose the right fitting type. There are four main types:

Hook plate fasteners – Work with flush-fitting timber windows and are often used where weather seals are present.
Mortice plate fasteners – Ideal for recessed windows where the sash and frame don’t sit flush.
Wedge plate fasteners – Draw the sash tightly into the frame for extra draught control.
Night vent fasteners – Designed to lock the window slightly open for secure airflow — a popular option for bedrooms and bathrooms.

Some fasteners come with both hook and mortice plates for flexibility across multiple window types.

Match your chosen fastener with your decor using finishes like beeswax, matt black, satin nickel, pewter, antique brass, or polished chrome. Styles like monkey tail, spoon end, and bulb end suit period and heritage properties beautifully.

For a complete setup, pair your fastener with a matching casement window stay in the same style and finish.

Unsure What to Choose?

Expert Advice & UK-Wide Supply

If you're not sure whether to use a hook plate or mortice plate, or you’re replacing a fastener on a weather-stripped window, we’re here to help. Our range includes both locking and non-locking casement window fasteners, as well as designs suitable for period renovations and contemporary builds.

Each product page includes finish, dimensions, and fitment details — making it easy to choose the right hardware. For guidance or to check compatibility, contact us here and our expert team will assist you.

Trade Door Handles proudly delivers across the UK.

Frequently Asked Questions

What is a casement window fastener?

It’s a rotating handle that locks the window closed by engaging with a plate on the frame — often used with timber or flush casement windows.

What’s the difference between hook, mortice and wedge plates?

Hook plate fasteners – Work with flush-fitting timber windows and are often used where weather seals are present.
Mortice plate fasteners – Ideal for recessed windows where the sash and frame don’t sit flush.
Wedge plate fasteners – Draw the sash tightly into the frame for extra draught control.
Night vent fasteners – Designed to lock the window slightly open for secure airflow — a popular option for bedrooms and bathrooms.

Do I need a locking casement fastener?

Locking fasteners are ideal for ground-floor or insurance-approved security. Non-locking fasteners are common on upper floors or listed buildings.

Which finish should I choose?

It depends on your decor! Popular finishes include black, antique brass, satin nickel, chrome, beeswax, and pewter.

Can I match the fastener with my stay?

Yes – see our Casement Window Stays for matching styles and finishes.