The hole the window mechanism fits into measures 8.35mm, or around .328". I can't tell if I'm on the top of the teeth, or in the grooves, but I'll bet you can figure it out from there...smile.
This crank is from a "egress window" in the basement. It is not a casement window, but operates in a similar way.
Can you help?
TIA for your assistance.
Tom
