The most important and variable consideration in handwheels is how the hub of the wheel is prepared and mated to the shaft of what it is driving. Hub styles include squares, hexes and half circles with set screws to retain them. Some are pressed into place on splines that are part of the shaft. Some are threaded to be screwed into place, and some are welded.
Another consideration in handwheel selection is how the wheel is attached to the drive shaft which connects to the operating end of things. This issue is as old as the first wheel on a handcart 2,000 years ago and has been solved in a wide variety of ways. The part of the handwheel that attaches to the shaft is called the bore.
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