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 (comprehensive expression)
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.
YB - Technical condition change (comprehensive expression)
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.