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Difference between american and asian o rings

Most mountains and mountain ranges are parts of mountain belts that have formed where two lithospheric plates have converged and where, in most cases, they continue to converge. In effect, many mountain belts mark the boundaries of lithospheric plates, and these boundaries in turn intersect other such boundaries. Consequently, there exist very long mountain systems where a series of convergent plate boundaries continue from one to the next. A nearly continuous chain of volcanoes and mountain ranges surrounds most of the Pacific basin—the so-called Circum-Pacific System.
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Explanations for the Revised Global O-ring Standard

ISO , the standard covering O-rings, the most commonly used seal, has been revised to meet American, European as well as Asian needs. ISO consolidates the long established AS B inch standard with the existing metric ISO and importantly, as it retains its original designation, means modification of documentation may not be required. The American AS B standard dates back more than 50 years. Originally, the high cost of tools to produce O-rings meant that inch O-rings were used in metric housings. Elastomer O-rings have a relatively large tolerance field between the minimum and maximum effective cross-section; where at the lower limit there will be sufficient squeeze to fill the sealing groove and at the higher, it will not extrude beyond the sealing gap.
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O-Ring Sizes: Standard & Metric O-Rings

Do you need help? Please call us at However, there are other sizing systems that you may encounter, particularly in Taiwan, Korea, and Hong Kong. These sizing systems use numeric scales that are close to one another.
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