Oil seal sizes chart metric pdf

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This article is about the mechanical oil seal sizes chart metric pdf. For other uses, see Oring.


The O-ring may be used in static applications or in dynamic applications where there is relative motion between the parts and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons.

O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable and have simple mounting requirements. O-rings can be produced by extrusion, injection molding, pressure molding or transfer molding. The first patent for the O-ring, is dated May 12, 1896 as a Swedish patent. Lundberg, the inventor of the O-ring, received the patent.

The US patent for the O-ring was filed in 1937 by a then 72-year-old Danish-born machinist, Niels Christensen. Despite his legal efforts, his intellectual property rights were passed from company to company until they ended up at Westinghouse. During World War II, the US government commandeered the O-ring patent as a critical war-related item and gave the right to manufacture to other organizations.

100,000 payment to his heirs in 1971, 19 years after his death. Pressure distribution within the cross-section of the O-ring.

The orange lines are hard surfaces, which apply high pressure. The fluid in the seams has lower pressure. The soft O-ring bridges the pressure over the seams. O-rings are available in various metric and inch standard sizes.

ISO 3601-1:2012 contains the most commonly used standard sizes, both inch and metric, worldwide. The UK also has standards sizes known as BS sizes, typically ranging from BS001 to BS932. Several other size specifications also exist.