The designations of most SKF rolling bearings follow a system that may consist of a basic designation with or without one or more prefixes and/or suffixes.
Examples and the applicable options for SKF single row deep groove ball bearings are given below.
Examples:
| E2.6306-2Z | where | E2. = | 1 |
| 6306 = | 2 | ||
| -2Z = | 4 | ||
| 60/670 N1MAS | where | 60/670 = | 2 |
| N1 = | 4 | ||
| MAS = | 5 |
1, Prefixes
| E2. | SKF Energy Efficient bearing |
| ICOS- | Oil sealed bearing unit |
2, Basic designation
| Figure with four digits: drawing number identification | |
| EE(B) | Inch bearing |
| R | Inch bearing |
| RLS | Inch bearing |
| RMS | Inch bearing |
| Bearing size for SKF inch bearings | |
|
2 to 40 |
(/8) 1/4 in. (6,35 mm) bore diameter
(/8) 5 in. (127 mm) bore diameter |
3, Suffixes - Internal design
| A, AA, C, D | Deviating or modified internal design |
| E | Reinforced ball set |
4, Suffixes - External design (seals, snap ring groove etc.)
| N | Snap ring groove in the outer ring |
| NR | Snap ring groove in the outer ring, with appropriate snap ring |
| N1 | One locating slot (notch) in one outer ring side face |
| -RS1, -2RS1 | Contact seal, NBR, on one or both sides |
| -RS2, -2RS2 | Contact seal, FKM, on one or both sides |
| -RSH, -2RSH | Contact seal, NBR, on one or both sides |
| -RSL, -2RSL | Low-friction seal, NBR, on one or both sides |
| -RZ, -2RZ | Non-contact seal, NBR, on one or both sides |
| -Z, -2Z | Shield on one or both sides |
| -ZNR | Shield on one side, snap ring groove in the outer ring, snap ring on the opposite side of the shield |
| -2ZNR | Shield on both sides, snap ring groove in the outer ring, with snap ring |
5, Suffixes - Cage design
| – | Stamped steel cage, ball centred |
| M | Machined brass cage, ball centred; different designs or material grades are identified by a number following the M, e.g. M2 |
| MA(S) | Machined brass cage, outer ring centred. The S indicates a lubrication groove in the guiding surface. |
| MB(S) | Machined brass cage, inner ring centred. The S indicates a lubrication groove in the guiding surface. |
| TN | PA66 cage, ball centred |
| TN9 | Glass fibre reinforced PA66 cage, ball centred |
| TNH | Glass fibre reinforced PEEK cage, ball centred |
| VG1561 | Glass fibre reinforced PA46 cage, ball centred |
6.1, Suffixes - Materials, heat treatment
| HA1 | Case-hardened inner and outer rings |
6.2, Suffixes - Accuracy, clearance, preload, quiet running
| P5 | Dimensional and running accuracy to P5 tolerance class |
| P6 | Dimensional and running accuracy to P6 tolerance class |
| P52 | P5 + C2 |
| P62 | P6 + C2 |
| P63 | P6 + C3 |
| CN |
Normal radial internal clearance; only used together with an additional letter that identifies a reduced or displaced clearance range
|
| C1 | Radial internal clearance smaller than C2 |
| C2 | Radial internal clearance smaller than Normal |
| C3 | Radial internal clearance greater than Normal |
| C4 | Radial internal clearance greater than C3 |
| C5 | Radial internal clearance greater than C4 |
| CA | Matched bearing set with small axial internal clearance |
| GA | Matched bearing set with light preload |
| VQ658 | Quiet running properties |
6.3, Suffixes - Bearing sets, matched bearings
| DB | Two bearings matched for mounting back-to-back |
| DF | Two bearings matched for mounting face-to-face |
| DT | Two bearings matched for mounting in tandem |
6.4, Suffixes - Stabilization
| SO | Bearing rings heat stabilized for operating temperatures ≤ 150 °C (300 °F) |
| S1 | Bearing rings heat stabilized for operating temperatures ≤ 200 °C (390 °F) |
6.5, Suffixes - Lubrication
|
GJN HT LHT23 LT LT10 MT33 MT47 WT |
Grease suffixes |
Technical specifications of SKF standard and special greases for capped SKF deep groove ball bearings
