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How to Measure a Gasket

How to Measure a Gasket

Gaskets can come in various shapes and sizes. We have put together a guide to help you measure some of the most common shaped gaskets correctly. Please follow the methods below to help you successfully measure a gasket.

Measuring Flange Gaskets

Method 1: The PCD (Pitch Circle Diameter)

Flange gaskets are sometimes known as full face gaskets because they have bolt holes on the face. If you utilize this sort of gasket, the PCD technique will assist you in accurately measuring your gasket. The PCD is the distance between the centers of two adjacent holes. If the hole sizes are equivalent, this may be measured using a tape measure from the inside of one hole to the outside of the other (as shown in the figure above). It’s also a good idea to write down the thickness of the gasket to ensure you have all of the necessary measurements.

Method 2: The IBC (Inner Bolt Circle) Gasket

Inner bolt circle gaskets, also known as ring gaskets, are made up of merely an exterior diameter and an interior diameter (OD and ID). By putting a tape measure (edge to edge) across the gasket face and noting the diameters, you may accurately measure this sort of gasket. It’s also a good idea to measure the thickness of the gasket so you can supply accurate measurements.

Flange Gasket Tables — To see all of the standard flange gasket tables, go here.

Measuring Picture Frame Gaskets

Method 1: The PCD (Pitch Circle Diameter)

Picture frame gaskets, which are typically square or rectangular in shape, will require both outside and inside dimensions (which can be achieved with a tape measure). Bolt holes will almost certainly be present around the frame, and they will be of a consistent dimension and spacing (although this may not always be the case, so it is best to check). The graphic above shows all of the dimensions needed for picture frame gaskets in great detail.

Please contact PAR Group to explore your alternatives if you are having trouble measuring any of your gaskets accurately. This might be in the form of further instructions on how to measure them yourself, sending a PAR representative to measure them for you, or sending us a sample to measure from one of our sales offices.

Additional Considerations When Measuring Gaskets

Please enter the following information so that we can offer you a price for your gasket needs:

Quantity Required


→ What are you trying to seal?

Size Details:

→ Standard flange type

→ Dimensions taken from the drawing (including the number of holes & material thickness).

→ If the design isn’t standard, it needs to be drawn.


→ Conveyed product

→ The range of temperatures.

→ What is it that the gasket is in touch with? (chemicals, acids, solvents, and so forth.)

→ It is necessary to have a pressure rating.

→ Is it an interior or exterior pipe gasket? Other pertinent environmental factors.

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