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  1. This Calculator will determine the preferred size and limit tolerances for Running or sliding to interference-locational fits per ANSI B 4.1.

  2. This Standard defines preferred tolerances for limits and fits for nonthreaded cylindrical features and defines specific sizes, fits, tolerances, and allowances for use where they are applicable. The ANSI B4.1 tolerance charts are provided in thousandths (.001) of an inch.

  3. Ø Identify a clearance fit, interference fit and transition fit. Ø Describe the basic hole and basic shaft system. Ø Dimension two mating parts using limit dimensions, unilateral tolerances, and bilateral. tolerances. Ø Describe the classes of fit and give example of each.

  4. Interference Fit: A fit type where interference exists between assembled parts under all tolerance conditions. Transition Fit: A fit type where clearance or interference can exist between assembled parts depending on tolerance conditions.

  5. Force and Shrink Fits are a type of interference fit which seek to maintain constant hole pressure for all sizes. The interferece varies almost directly the diameter of the parts. The interference between the min and the max value is kept small to ensure that resulting pressure are reasonable.

  6. Calculate the limits of sizes for f 20 P7/h6 and identify the fit. Therefore, D is given by –. The fit is Interference. But it can become Transition if you choose some value of FD for p shaft between IT7 + 1 to 5 μm.

  7. Example Evaluate limits and fits for an assembly pair 6 H7/ g6 mm Solution: The size 6 mm lies in the diameter step of 3-6. The Fundamental tolerance unit is = 0.7327 μm Tolerance for hole H7 Tolerance = 16i = 12 μm The fundamental deviation H hole = Zero Tolerance for g6 shaft Tolerance = 10i = 8 μm

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