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The Ultimate Resource for Engineering and Technical Research. (Learn More) |
Understanding Tolerance Stack-up
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From Apple Rubber Products, Inc.
Tolerance stack-up is an especially important factor in microminiature O-rings due to the fact that the tolerances account for a large percentage of the nominal O-ring size. In a sealing application, the tolerances of all the parts in contact with the O-ring must be considered in order to create an effective seal. The combination of these tolerances is the tolerance stack-up. The graph above shows a situation where the O-ring cross section tolerance is ±0.003", the groove diameter tolerance is ±0.002", and the bore diameter tolerance is ±0.001". In this example the metal dimensions can vary up to 0.006", while the O-ring can also vary up to 0.006". Therefore, the total tolerance stack-up is 0.012". If the nominal O-ring size is 0.030", it is easy to see that the tolerance stack-up is nearly half the size of the O-ring. This can result in too much or too little compression which can cause the O-ring to fail. Products & Services
O-rings are solid-rubber seals that are shaped like a doughnut. When pressed between two mating surfaces, O-rings block the passage of liquids or gases.
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Learn more about O-rings
Plug and pin gauges are used to compare hole and slot dimensions or locations to specific tolerances. This product area includes go gauges and no-go gauges.
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Learn more about Plug and Pin Gages
Round belts and o-ring belts are light-to-medium duty power transmission belts. They can be solid or hollow, and can easily be used in 3-D applications.
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Learn more about Round Belts and O-ring Belts
Ring gages are used for go / no-go assessment compared to the specified dimensional tolerances or attributes of pins, shafts, or threaded studs.
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Learn more about Ring Gages
Retaining rings and snap rings are fasteners used to axially position a component on a shaft or in a bore.
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Learn more about Retaining Rings and Snap Rings
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