Martin Bearing MaintenanceBearing Suffixes D - F
Bearing Suffixes: A - B :: C :: D - F :: G - K :: L - N :: P - S :: T - Z
| D |
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| Two single row deep groove ball bearings (1), single row angular contact ball bearings (2) or single row tapered 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 pre-load in the bearing pair before mounting. A Light pre-load (2) B Moderate pre-load (2) C Heavy prel-oad (2) CA Axial internal clearance smaller than Normal (CB) (1, 2) CB Normal axial internal clearance (1, 2) CC Axial internal clearance larger than Normal (CB) (1, 2) C Special axial internal clearance in µm GA Light prel-oad (1) GB Moderate pre-load (1) G Special pre-load in daN | |
| Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings matched for mounting in a face-to-face arrangement; the letter(s) following the DF are explained under DB | |
| Two single row angular contact ball bearings for universal pairing, i.e. paired for mounting in a back-to-back, face-to-face or tandem arrangement; supplementary designations for axial internal clearance and pre-load are explained under DB | |
| Single direction thrust bearing with two housing washers | |
| Two single row deep groove ball bearings or cylindrical roller bearings paired to achieve even radial load distribution | |
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| Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings matched for mounting in a tandem arrangement; for paired tapered 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 DT | |
| Deep groove ball bearing of open design, also available as standard with shields or seals, but without seal recesses in the outer ring | |
| E | Deviating or modified internal design with same boundary dimensions; as a rule the significance of the letter is bound to the particular bearing series; usually indicates reinforced rolling element complement Example:
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| Single row cylindrical roller bearing with an optimized internal design and with modified roller end/flange contact | |
| Spherical roller bearing of CA design but with reinforced rolling element complement | |
| Spherical roller bearing of CAC design but with reinforced rolling element complement | |
| E combined with a two or three-figure number identifies variants of the standard design which cannot be identified by generally applicable suffixes | |
| F | Machined steel or special cast iron cage, rolling element centered; different designs or material grades are identified by a figure following the F, e.g. F1 |
| Machined steel or special cast iron cage; outer ring centered | |
| Machined steel or special cast iron cage; inner ring centered | |
| Y-bearing with plain finger at both sides |