Preferred Force Shrink Fits Chart ANSI B4.1 Table Calculator

Engineering, Manufacturing Tolerance Limits Fits Charts

This Calculator will determine the preferred size and limit tolerances for a force or shrink fit per ANSI B 4.1.

FN 1 Light drive fits are those requiring light assembly pressures, and produce more or less permanent assemblies. They are suitable for thin sections or long fits, or in cast-iron external members.

FN 2 Medium drive fits are suitable for ordinary steel parts, or for shrink fits on light sections. They are about the tightest fits that can be used with high-grade cast-iron external members.

FN 3 Heavy drive fits are suitable for heavier steel parts or for shrink fits in medium sections.

FN 4 and FN 5 Force fits are suitable for parts that can be highly stressed, or for shrink fits where the heavy pressing forces required are impractical.

Other types of fits: See --> Preferred Tolerances & Fits Calculator RC - LT Fits

• RC - Running or Sliding Fits
• LC - Clearance Locational Fits
• LT - Transition Locational Fits
• LN - Interference Locational Fits

Related:

• Preferred Tolerance Limits Fits ANSI B4.1
• Press Fit Design Stresses Calculator
• Preferred Tolerances Metric ISO 286
• General ISO Geometrical Tolerances Per. ISO 2768

NOTE: Maximum Nominal Size Input to Calulator is Ø19.69".

Force or Shrink Fits Tolerances  per. ANSI B4.1 Table Calculator

Variables

Enter the desired tolerance =

FN 1 FN 2 FN 3 FN 4 FN 5

Enter shaft nominal diameter (inch) =

Results

Max

Min

Tolerance (thousandths in) =

SHAFT Diameter max / min in. =

Tolerance Zone =

Max

Min

Tolerance (thousandths in) =

HOLE Diameter max / min in. =

Tolerance Zone =

Max

Min

Interference (in) =

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