Parts of a Casement Window

Posted by Window Hardware Direct on

Today we're going to be taking a look at the various parts of a casement window. Whether you're looking for replacement parts for your casement window, or are just curious how casement windows function, this post will cover all you need to know. 

Parts of a Casement Window

Various Parts of a Casement Window


We'll start off with the window sash. A window's sash is simply the part of the window that holds the glass and keeps it in place. Generally, the sash can be moved outward with the help of a casement operator. Most often, casement windows have their hinges on the side, however, sometimes the hinges are located on the top. In this case, the window is called an awning window. Window sashes are important to the construction of the window. If a sash is not constructed or installed properly, it may distort and warp over time leading to improperly sealed windows that may leak or stop locking properly reducing the efficiency and security of your home.

Locking Handle / Locking Cam

The locking handle and locking cam are parts that, as the name implies, locks the window sash into place. Often times there is just one locking handle near the bottom of the window that is connected to a locking cam at the top by a tie bar. In our case, the window has two locking handles that are not connected. 

Casement Window Locking Handle

Casement Window Locking Handle in Unlocked Position


The keeper for casement windows is what the locking handle and locking cam hook into to lock and secure the sash. The keeper is usually located on the side of the moveable sash. 

Casement Window Keeper

Casement Window Keeper 

Butt Hinge

Casement window butt hinges also known as piano hinges are what allows the sash to swing outward. For most casement windows, the butt hinges are located on one side. Occasionally, the hinges are located at the top of the sash. In this case, the window is called an awning window.

Casement Window Butt Hinge

Butt Hinge for Casement Windows

Operator and Operator Handle

The casement window operator and operator handles are used to actually move the window sash. The handle attaches to the operator and is turned to make the window swing outwards. Operators have either one arm or two arms. In both cases, one arm (or the only arm) fits into a track on the bottom of the window sash and slides along the track while pushing the sash outward.

Casement Window Operator Handle

Casement Window Operator and Operator Handle

Casement Window Operator Arm

Casement Window Operator Arm

Casement Window Operator Track

Casement Window Operator Arm in the Track on the Bottom of the Sash

These are some of the more commonly found window parts on casement windows. Each window is different and may contain additional parts. If you are not sure what a part is or don't know which part you need, feel free to contact us or chat with us and one of our experts will be happy to assist you.

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