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Measuring a Full Face Gasket

  • Inner Diameter (I.D.): measure the inside edges.
  • Outer Diameter (O.D.): measure across the gasket to each outside edge as illustrated.
  • Bolt Holes: count the number of Bolt Holes around the gasket.
  • Bolt Hole Diameter: measure across the insde edge of a hole.
  • Bolt Circle Diameter: measure from the outside edge of one bolt hole and the inside edge of a bolt hole directly across from it.
  • Thickness: measured using a measuring tape or calipers.

Measuring a Ring Gasket

  • Inner Diameter (I.D.): measure the inside edges.
  • Outer Diameter (O.D.): measure across the gasket to each outside edge as illustrated.
  • Thickness: measured using a measuring tape or calipers.