O Ring Cross Section Formula

Until now o ring standards have left a gap between the 1 8 and 3 16 nominal cross sections. The actual calculation for the cross section needed in an o ring varies depending on whether it will be used in a dynamic or static application. An o ring sizing cone how to measure o ring dimensions.

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Info o ring compression info free.

O ring cross section formula.

Please contact us if you are looking for a size not shown in the 5 32 group. The difference between the original o ring cross section and the final o ring cross section once installed is known as the compression squeeze. In a dynamic situation. Info results at installation min.

By selecting it to be slightly less than the groove s inner diameter the o ring will stretch and hug the groove. O ring sealing careful consideration must be given to the size of the o ring in relation to the size of the glandular space into which the o ring is being installed. O ring sizes are specified by the inside diameter outside diameter od and the diameter of the cross section thickness. Cross section diameter mm calculate results reset calculator generate printable document results.

Recommendations are based on available technical information and are offered as suggestions only any reliance placed on such information by the user is strictly at the user s risk. It is a loop of elastomer with a round cross section designed to be seated in a groove and compressed during assembly between two or more parts creating a seal at the interface. For example if your o ring s cross sectional diameter is 1 25 inches and its gland depth is 1 20 inches subtract 1 20 from 1 25 to determine that the o ring is able to squeeze out a total of 05 inches. Nominal cross section o rings.

The o ring may be used in static applications or in dynamic applications where there is relative motion between. The measurements are either in inches or in millimeters. For recommended o ring c s squeeze values please refer to page 11 12. O ring application pressure vs.

The o ring must be compressed by a predetermined amount and this compression determines the o ring cross section diameter. In de signing this new group of o rings we left spacing in the part numbers to allow us to add additional sizes should they be required. O ring installed stretch groove diameter o ring id o ring id general rule is 0 5. O ring gland clearance gap size.

Info o ring compression info free groove volume o ring inner diameter stretch o ring outer diameter upsetting info results at service min. An o ring also known as a packing or a toric joint is a mechanical gasket in the shape of a torus. Excessive stretch can overstress material thin cross section and reduces squeeze cross section reduction due to stretch about half of the id stretch. The o ring inner diameter is typically chosen to be close to the groove s inner diameter.

Find your o ring s squeeze amount in inches by subtracting the gland depth from cross sectional diameter with a calculator. The o ring calculator tool is intended to form the basis of an o ring installation and assist with selection of o ring and hardware dimensions. In the uk o ring sizes are specified by the british standard bs and each ring size has a related bs number.