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Technical : 8.1 Interference Fit vs. Nominal Sizing

8.1 Interference Fit vs. Nominal Sizing

Although a slip-fit may allow faster, easier assembly, an interference fit is generally preferred.  This results in acquiring a seal on initial assembly, leaving maximum adjustment available to compensate for future wear.

If a packing-ring set is selected with nominal sizes of 1-1/4" ID and 1-3/4" OD, the shaft is assumed to measure 1.250" and the bore to measure 1.750".  Ideally the packing-ring set ID  will measure 1.250" plus nothing minus “something”, and the OD will measure 1.750" minus nothing plus “something”.  Due to process variances the packing-ring sets will occasionally deviate in size but will function regardless.

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