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An interference fit, also known as a pressed fit or friction fit, is a form of fastening between two tightfitting mating parts that produces a joint which is held together by friction after the parts are pushed together.
Positive allowance specifies the clearance fit whereas negative allowance in a fit specifies the interference or force fit. The relationship existing between two parts, shaft, and hole, which are to be assembled, concerning the difference in their sizes before assembly, is called a fit.
Interference Fit: In Interference Fit, the tolerance zone of the shaft goes above the tolerance zone of the hole. This means the shaft here is of large size, and the hole is of small size.
Interference fits are also known as press fits or friction fits. These types of fits always have the same principle of having a larger shaft compared to the hole size. Max interference – left; min interference – right
An interference fit always ensures positive interference between the hole and shaft across their tolerance range, resulting in a tight fit without any gap between mating parts, often requiring tools for precise assembly.
Understanding Shaft and Hole Clearance to Interference Fits, How to Determine Fit, and Specifying a Fit in Mechanical System Design
Interference fit are also known as friction fit or press fit and they have a fastening of two components by pushing both of them with each other. The fastening can be done by various mechanisms and need substantial force for coupling and uncoupling the components.
In interference fits, also known as press fits, force fits or shrink fits, a rigid shaft is joined to a more ductile hub or boss by a dimensional interference between the outside diameter of the shaft and the inside diameter of the hub.
An interference fit (press fit & shrink fit) is a frictional shaft-hub connection. Joint pressure in the friction surface is necessary for the torque (force) transmission and this pressure is generated by the deformation of shaft and hub.
In the specific case of a shaft press fit into the hub of a gear, the outside diameter (OD) of the shaft is slightly larger than the inside hole diameter (ID) of the hub. The diametral difference between the shaft OD and the ID of the hub hole is referred to as the interference fit.