• 10 parts
  • Checked September 2026

Parts of a Casement Window

A crank-out casement from inside, then cranked open and seen from above.

Parts of a Casement Window

Name Date

Tap any part to read, rename or leave it out

1 2 3 4 5 6 7 8 9 10
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Write the name of each numbered part.Answer key

  1. Sash
  2. Frame
  3. Crank handle
  4. Operator
  5. Lock handle (sash lock)
  6. Insect screen
  7. Hinge
  8. Arm
  9. Track (guide track)
  10. Keeper

Drawn for this site on 2026-09-30 from plain geometry. Licence: own work.

Each numbered ring is a button. Use the arrow keys to move between them and Enter to choose. Names are read out in Study, and once a part is answered.

Next step Next: every part of a house window

All 10 parts on the diagram

Show the list

Start here: 6 main parts 6

  1. Sash Stiles, rails and glass joined together; the part that opens.
  2. Frame The outer structure that holds the sash in position.
  3. Crank handle The handle you turn; it drives the operator.
  4. Operator A crank-operated device that opens and closes the sash.
  5. Lock handle (sash lock) A lever on the frame that locks the sash shut.
  6. Hinge It joins the sash to the frame at the side.

From inside 1

  1. Insect screen Tightly woven mesh in a frame; keeps insects out.

Cranked open, from above 3

  1. Arm The operator's metal arm; it pushes the sash open.
  2. Track (guide track) A strip on the sash that the arm's end slides in.
  3. Keeper The receiver on the sash that the lock engages.

How this list was compiled: Read 2026-09-30; a name is kept only where two independent sources use it (two documents of one maker count as one). (1) A window and door maker's glossary, https://www.andersenwindows.com/support/window-door-glossary/ : casement window (hinged at a side; its sash opens sideways, opposite the hinge), operator (metal arm, gear and handle that open and shut hinged windows), crank handle, sash (rail, stile and glass parts joined into one), frame (outer structure that holds the sash in position), sash lock, keeper (part on a sash the lock catches), insect screen (fine woven mesh fixed to a frame), awning window, French casement window. (2) A second maker's glossary, https://www.marvin.com/support/glossary , and its casement parts and service manual, https://archive.org/details/manualzilla-id-6006802 : operating casements have a crank handle; roto-gear (the steel drive worm, gears and crank that open awnings and casements); sash and frame; release the lock handle, crank the unit open; the roto-gear straight arm attaches to a slider in the guide track; hinge arm and hinge track; keeper; screens. (3) A third maker's owner's manual, https://archive.org/details/manualzilla-id-5934788 : casement windows have a single sash hinged to open by crank; a single sash lock handle operates both locks; unlock before cranking or risk damaging the operating mechanism; clean the window track; screens. (4) Efficient Windows Collaborative glossary, https://www.efficientwindows.org/glossary/ : casement (a window sash swinging open on side hinges), operator (a crank-worked device that opens and closes casement or jalousie windows), hinged windows (casement, awning and hopper), awning (hinged at the top), hopper (hinged at the bottom). (5) Wikipedia, Casement window: hung on its frame by one or more side hinges; opened by a crank, lever or cam handle; windows hinged at the top are awning windows and at the bottom hoppers. Licence: own work

The drawing: Drawn for this site on 2026-09-30 from plain geometry; nothing traced. Licence: own work

How it works

A casement window is hinged at the side and swings open like a door, usually on a crank. These are the names window makers use for its frame, its sash and its hardware.

Read the full guide

From inside

The sash holds the glass and swings. The frame is fixed in the wall and holds the sash. The crank handle turns the operator, a geared device on the sill. The lock handle on the frame holds the sash shut; where one handle works several locks at once it is a multi-point lock. The insect screen is mesh in a frame of its own, and it comes out.

Cranked open, from above

Turning the crank swings the operator's arm outward. The end of the arm slides along a track on the sash and pushes the sash open on its hinge. The keeper is the piece on the sash that the lock catches when the window is shut.

  • Unlock the lock handle before you crank. Cranking against a locked sash can damage the operator.

Questions and answers

What are the parts of a casement window called?

The frame is fixed in the wall and the sash swings in it on hinges. The hardware is the operator with its crank handle and arm, the track the arm slides in, and the lock handle with its keeper. Most also have an insect screen.

What is the crank on a casement window called?

The whole device is the operator: a metal arm, a gear and a handle. The part you turn is the crank handle.

What is the difference between a casement and an awning window?

A casement is hinged at the side and swings out sideways. An awning window is hinged at the top and swings out from the bottom. A window hinged at the bottom is a hopper.

What is a French casement window?

Two casement sashes in one frame that open outward from the middle, with no post between them, so the whole opening is clear when both are open.

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