Casement Fasteners

Aged Brass Monkeytail Fastener, from our current range.

What is a casement fastener?

A casement fastener is a lever handle fitted to the opening edge of a casement window, which pulls the window shut against a fixed strike plate or pin on the frame. It is the simplest and most widely used type of window handle, found on the great majority of casement windows, and comes in a range of traditional profiles, from a straight lever to the distinctive curved "monkeytail" shape often seen on period properties.

Locking versions are also available, adding a key-operated function for extra security, often specified to meet home insurance requirements alongside door locks.

Where casement fasteners are used

• Casement windows – the standard fastener type for most window heights
• Period properties – decorative profiles such as monkeytail and reeded designs suit character windows
• Insurance-conscious properties – locking casement fasteners are often specified alongside window locks

Choosing the right casement fastener

A few practical points are worth checking before you buy:

• Locking or non-locking – locking versions add security, sometimes required by insurance policies
• Night-vent function – some fasteners include a night-vent position, holding the window slightly ajar for ventilation while still secured
• Handing – check whether your window opens left or right, as many fasteners are handed
• Style – profiles range from plain and contemporary to decorative period designs

Related products

Browse our current range in Fasteners, or see the related Espagnolette Handles guide.

Frequently asked questions

What is a night-vent casement fastener?

A night-vent fastener has an additional catch position that holds the window slightly open for ventilation, while still being more secure than leaving it fully unfastened.

Do casement fasteners come in locking versions?

Yes, locking casement fasteners are widely available and are often specified to meet home insurance requirements, particularly on ground floor windows.

Can I replace a casement fastener myself?

Yes, in most cases a casement fastener can be replaced with basic tools once you have confirmed the correct handing and fixing centres to match your window.

Back to the Window Furniture Guide, or explore the full Knowledge Centre.