The standard sizes used by o ring manufacturers in the united states are defined by aerospace standard as568b aerospace size standard for o rings.
O ring gauge chart.
That document published by the society of automotive engineers sae lists the sizes of o rings in six series or groups in both inches and millimeters.
Lightly clamp the jaws of the caliper onto the o ring but do not compress it.
O ring is mechanically squeezed out of round between the outer and inner members to close the fl uid passage.
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Place the o ring into a vernier caliper.
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The seal material under mechanical pressure extrudes into the microfi ne grooves of the gland.
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Metric and inch cross section thickness reference gauge.
Note that the o ring has been.
Record the thickness of the ring the cross section see image for reference.
Quick reference tape measure confirms metric size o rings 64mm 665mm inside diameter on one side and usa as568 standard o ring sizes from 2 5 id to 26 inside diameter on the other side.