An interference fit, also known as a press fit or friction fit,[1] is a fastening between two parts which is achieved by friction after the parts are pushed together, rather than by any other means of fastening.
Clearance fits for when it may be desirable for the shaft to rotate or slide freely within the hole, this is usually referred to as a "sliding fit."
Transition fits for when it is desirable that the shaft to be held securely, yet not so securely that it cannot be disassembled, this is usually referred to as a Location or Transition fit.
