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From applerubber.com
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.
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.
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.
Ring gages are used for go / no-go assessment compared to the specified dimensional tolerances or attributes of pins, shafts, or threaded studs.
Masters and setting gages provide dimensional standards for calibrating other gages.
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