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Glossary O


Glossary O

Offset:
The radial distance between the axis of the seal bore and the axis of shaft rotation.

Oil Resistance:
The measure of an elastomer’s ability to withstand the deteriorating effect of oil on the mechanical properties.

Oil Seal:
A seal designed primarily for the retention of oil.

Oil Swell:
The change in volume of a rubber material due to absorption of oil.

O-Ring:
A torodial shaped seal.

Out-of-round, Shaft:
The deviation of the shaft cross section from a true circle. Out-of-round is measured as the radial distance, on a polar chart recording, between concentric, circumscribed, and inscribed circles which just contain the trace and are so centered that the radial distance is minimized.

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