| M |
Machined Brass Cage, Ball Centered; Different Designs And Material Grades Are Identified By A Figure Following The M, e.g. M2 |
| DB |
Two single row deep groove ball bearings, single row angular contact ball bearings or single row taper roller bearings matched for mounting in a back to back arrangement; the letter(s) following the DB indicate the magnitude of the axial internal clearance or preload in the bearing before mounting; for paired taper roller bearings the design and arrangement of the intermediate rings between the inner and/or outer rings are identified by a two-figure number which follows immediately after DB |
| CA |
Small axial internal clearance (deep groove and angular contact ball bearings |
