A dowel pin may have a smaller diameter than its hole so that it freely slips in, or a larger diameter so that it must be pressed into its hole ( an interference fit ).
22.
Reamed holes are used to create holes of precise circularity and size, for example with tolerances of-0 / + 0.02 mm ( . 0008 " ) This will allow the force fitting of locating dowel pins, which need not be otherwise retained in the body holding them.
