O Ring Cross Section Formula

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.

O ring cross section formula.

O ring sizes are specified by the inside diameter outside diameter od and the diameter of the cross section thickness. The o ring inner diameter is typically chosen to be close to the groove s inner diameter. 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. Cross section diameter mm calculate results reset calculator generate printable document results.

An o ring sizing cone how to measure o ring dimensions. 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. By selecting it to be slightly less than the groove s inner diameter the o ring will stretch and hug the groove. The o ring must be compressed by a predetermined amount and this compression determines the o ring cross section diameter.

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 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. Until now o ring standards have left a gap between the 1 8 and 3 16 nominal cross sections.

For recommended o ring c s squeeze values please refer to page 11 12. 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 gland clearance gap size. Info results at installation min.

The o ring may be used in static applications or in dynamic applications where there is relative motion between. 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. Info o ring compression info free. In a dynamic situation.

O ring application pressure vs. 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 measurements are either in inches or in millimeters. An o ring also known as a packing or a toric joint is a mechanical gasket in the shape of a torus.

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. In the uk o ring sizes are specified by the british standard bs and each ring size has a related bs number. Excessive stretch can overstress material thin cross section and reduces squeeze cross section reduction due to stretch about half of the id stretch.