A component is described this way when its thickness gradually reduces to a near-zero edge, blending smoothly into another surface. This profile is often applied to keys, shims, or bearing inserts to prevent sharp steps that could cause stress concentrations or interfere with fluid flow. In assembly, a tapered edge ensures a flush fit without catching against mating parts.
Heard on the job
Make sure the trailing edge of the bearing shell is feathered so it doesn't scrape the journal.