O Ring Cross Section Formula

In a dynamic situation.

O ring cross section formula.

The o ring inner diameter is typically chosen to be close to the groove s inner diameter. By selecting it to be slightly less than the groove s inner diameter the o ring will stretch and hug the groove. In the uk o ring sizes are specified by the british standard bs and each ring size has a related bs number. 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.

Until now o ring standards have left a gap between the 1 8 and 3 16 nominal cross sections. 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. Nominal cross section o rings. Info o ring compression info free groove volume o ring inner diameter stretch o ring outer diameter upsetting info results at service min.

O ring sizes are specified by the inside diameter outside diameter od and the diameter of the cross section thickness. O ring gland clearance gap size. The o ring may be used in static applications or in dynamic applications where there is relative motion between. Find your o ring s squeeze amount in inches by subtracting the gland depth from cross sectional diameter with a calculator.

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. Please contact us if you are looking for a size not shown in the 5 32 group. Excessive stretch can overstress material thin cross section and reduces squeeze cross section reduction due to stretch about half of the id stretch. 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. An o ring sizing cone how to measure o ring dimensions. An o ring also known as a packing or a toric joint is a mechanical gasket in the shape of a torus. Info results at installation min.

For recommended o ring c s squeeze values please refer to page 11 12. O ring installed stretch groove diameter o ring id o ring id general rule is 0 5. 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. 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.

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. 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. The difference between the original o ring cross section and the final o ring cross section once installed is known as the compression squeeze.