The chart below gives the metric and inch dimensions for the most common AS568 sizes of backup rings.
NOTE: The “A” dimension, or Axial Height, applies only to the rubber contoured backup rings. PTFE backup rings are flat, so they do not have this contour.
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Backup Ring Size Chart
|DASH #||ID (in)||WIDTH (in)||THK (in)||A (in)||ID (mm)||WIDTH (mm)||THK (mm)||A (mm)|