Accurate measurements ensure the perfect seal. Follow our step-by-step guide to measure your gasket correctly.
For precise thickness and small diameter measurements
For larger diameters and bolt circle measurements
To record dimensions accurately
Measure the inner hole of the gasket from edge to edge at the widest point. For flange gaskets, this matches the pipe inner diameter. Take measurements at multiple points and use the average.
Measure from outer edge to outer edge at the widest point. The OD should match the flange face diameter. For non-circular gaskets, measure length and width at the widest points.
Use a vernier caliper to measure the gasket thickness at multiple points around the gasket. Record the measurement in millimeters. Standard thicknesses range from 1.0mm to 5.0mm.
For flange gaskets, measure the bolt hole diameter and the bolt circle diameter (center of one bolt hole to center of the opposite hole). Count the number of bolt holes.
Pro Tip: Always measure an existing gasket that has been working well for your application. If replacing a worn gasket, order the same dimensions. For new applications, measure the flange face dimensions directly.
A compressed or damaged gasket gives incorrect dimensions. Always measure the flange face if the gasket is deformed.
Specify all measurements in millimeters (mm) to avoid confusion. We manufacture in metric dimensions.
Don't forget to specify bolt hole dimensions and number of holes for flange gaskets.
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