Suffix /Y: Y and another letter (e.g., YA, YB) or a combination with numbers are used to identify non-serial changes that cannot be expressed with existing suffixes.
YA - Structural change
YA1 - Outer surface of the bearing outer ring differs from the standard design.
YA2 - Inner bore of the bearing inner ring differs from the standard design.
YA3 - End face of the bearing ring differs from the standard design.
YA4 - Raceway of the bearing ring differs from the standard design.
YA5 - Rolling elements of the bearing differ from the standard design.
YA6 - Chamfer of the bearing assembly differs from the standard design.
YA7 - Rib or retaining ring of the bearing differs from the standard design.
YA8 - Cage structure change.
YA9 - Contact angle of the bearing differs from the standard design (angular contact ball bearing).
YA10 - Double row tapered roller bearing with oil groove and oil hole on the inner spacer or changes in the spacer dimensions.
YAB - Simultaneous change in structure and technical requirements.
YAD - The same model of bearing, the structure has more than two changes at the same time.
YB - Technical requirements change.
YB1 - Bearing ring surface has a coating.
YB2 - Bearing size and tolerance requirements change.
YB3 - Bearing ring surface roughness requirements change.
YB4 - Heat treatment requirements (e.g., hardness) change.
YB5 - Special requirements for form and position tolerances.
YBD - The same model of bearing, the technical requirements have more than two changes at the same time.