Interference between the min and the max value is kept small to ensure The interferece varies almost directly the diameter of the parts. These fits are designed, above all, for transfers of torsional moments using friction forces between Holes and Shafts.įorce and Shrink Fits are a type of interference fit which seek to maintain constant hole pressure for all sizes. VALUES SHOWN BELOW ARE IN THOUSANDTHS OF AN INCHES The values given under the 'Clearance Limits Column' represent min and max amounts of clearance resulting fromĪpplication of standard tolerance limits. All data given in bold in the chart belowĪre in accordance with ABC agreements. Limits for Shaft and Hole are applied algebraically to the Nominal (basic) size to obtain the limits of the size for the parts. are Shaft and Hole designations used in American-British-Canadian System (ABC). Graphical Representation of ANSI B4.1-1967 Locational Interference Fits Table Locational Interference Limits and Fits For Cylindirical Parts Īll limits shown in chart below are in thousandths of an inches. SHAFT 's6' with Hole 'H7' is used and typical applications are collars pressed on to shafts, valves seatings, etc. The amount of interference is too small for satisfactory press fit to be obtained in materials of low modulus of elasticity such as light alloys. It is the standard press fit for steel, cast iron, or brass to steel assemblies. SHAFT 'p6' with Hole 'H7' gives a true interference fit. Part to another by virtue of the tightness of fit. Such fits are not for parts designated to transmit frictional loads from one Requiring rigidity and alignment with no special requirements for bore pressure.The parts can be assembled or disassembled using cold pressing and greater forces or hot pressing.

Machinability of the Certain Material EvaluationsĬ-) Locational Interference Fits :These fits are used where accuracy of location is prime importance.Locational interference fits are used for parts.

Machinability and the specific cutting force.

Identification System For Indexable Inserts.

Selection of Carbide to machine the work-part.

Terms and Definitions of the Cutting Tools.

Calculation of Upper and Lower Deviation For Holes.

Calculation of Upper and Lower Deviation For Shaft.

Fundamental Deviations For Hole and Shaft Basis.

ISO International System For Limits And Fits.ANSI and ISO Geometric Tolerancing Symbols.

H7 hole tolerance fit