SKF  bearings   Prefixes and suffixes 

OBT Bearing           2017-9-7

SKF has been a leading global technology provider since 1907. Our fundamental strength is the ability to continuously develop new technologies – then use them to create products that offer competitive advantages to our customers.

We achieve this by combining hands-on experience in over 40 industries with our knowledge across the SKF technology platforms: bearings and units, seals, mechatronics, services and lubrication systems. Our success is based on this knowledge, our people, and our commitment to SKF Care principles.

The focus of SKF’s technology development today is to reduce the environmental impact of an asset during its lifecycle, both in our own and our customers’ operations. The SKF BeyondZero product portfolio is the latest example of what SKF has to offer in this area.

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, as shown in the table and the examples below.

Prefixes and suffixes provide additional information about the bearing.

Prefixes are mainly used to identify components of a bearing. They can also identify bearing variants.

Suffixes identify designs or variants, which differ in some way from the original design or from the current basic design. The suffixes are divided into groups. When more than one special feature is to be identified, suffixes are provided in the order shown in the table below. 

Descriptions of commonly used prefixes and suffixes are given in the following sub-sections.
Details of the significance of specific prefixes and suffixes are given in the relevant product sections.

G                  1.Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have axial internal clearance
                     2. Thread diameter changed according to revised ISO standard
                     3. Lubrication groove in the outside surface, located at the side opposite the locking device
G.. Grease filling. A second letter indicates the temperature range of the grease and a third letter identifies the                     actual grease. The significance of the second letter is as follows:
                    E      Extreme pressure grease
                    F      Food compatible grease
                    H, J   High temperature grease
                    L      Low temperature grease
                   M     Medium temperature grease
                   W, X     Low/high temperature grease
                   A    figure following the three-letter grease code indicates that the filling degree deviates from the standard: 1, 2 and 3 indicate smaller than standard, 4 to 9 a larger fill
GA               Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have extra light or light preload
GB                Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have light or moderate preload
GC                Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have moderate or heavy preload
GD                Bearing for universal matching. Two bearings arranged back-to-back or face-to-face have heavy preload
GEM9           Filled to 70–100% with SKF LGHB 2 grease
GJN                 Grease with a polyurea thickener of consistency 2 to the NLGI Scale for a temperature range –30 to +150 °C (normal fill grade)
GMM             Open single direction bearing filled with standard grease
GR                   Lubrication groove in the outside surface, located at the side of the locking device
GWF               Grease with a diurea thickener of consistency 2 to 3 to the NLGI Scale for a temperature range -40 to +160 °C (normal fill grade)
H                     1.Bearing without an inner ring and reduced inside diameter (under rollers) tolerance, the numbers                             following indicate the tolerance limits in µm, e.g. H+27+20
                         2. One oil supply duct at the threaded end
                         3. KMFE lock nut with a bigger contact diameter
                          4. Two lubrication holes on the non-thrust side of the outer ring
H1                  Two lubrication holes on the thrust side of the outer ring
HA                   Case-hardened bearing or bearing components. For closer identification HA is followed by one of the                       following figures:
                  0 Complete bearing
                 1 Outer and inner rings
                 2 Outer ring
                 3 Inner ring
                 4 Outer ring, inner ring and rolling elements
                 5 Rolling elements
                 6 Outer ring and rolling elements
                 7 Inner ring and rolling elements
HB            1.Bainite-hardened bearing or bearing component. For closer identification HB is followed by one of the figures                 explained under HA
                 2.One or two oil supply ducts at the threaded end
HC                Bearing or bearing components made of silicon nitride. For closer identification HC is followed by one of the figures explained under HA
HE                Bearing or bearing component of vacuum remelted steel. For closer identification HE is followed by one of the figures explained under HA
HM               Martensite-hardened bearing or bearing component. For closer identification HM is followed by one of the figures explained under HA
HN              Special surface heat treated bearing or bearing component. For closer identification HN is followed by one of the figures explained under HA
HR               Polymer ball bearing
HT                  Grease with a polyurea thickener of consistency 2 to 3 to the NLGI Scale for a temperature range –40 to +150 °C (normal fill grade)
HV               Bearing components of stainless steel, seals and flingers with food-compatible rubber, food-grade grease
IS               Inner ring with lubrication hole(s), the number following indicates the number of holes
ISR Inner ring with annular groove and lubrication hole(s), the number following indicates the number of holes
J Sheet steel cage, rolling element centred, the number following indicates a different cage design
JA Sheet steel cage, outer ring centred
JB Sheet steel cage, inner ring centred
JHA Sheet steel cage, hardened, outer ring centred
JR Sheet steel cage, unhardened, riveted together
JW Sheet steel cage, unhardened, welded
K                 Tapered bore, taper 1:12
                     Cylindrical roller and cage thrust assembly
                        Polymer ball bearings with components made of Polyvinylidene fluoride (PVDF)
K30 Tapered bore, taper 1:30


SKF ,  FAG , TIMKEN , NSK , KOYO , NACHI , NTN , INA , Luk , IKO , THK ,   FYH , ASAHI , SNR, NADELLA , URB, ZKL, ZVL , TORRINGTON ,  JNS, IJK , GMN , GRW , STIEBER, DODGE, FAFNIR , MCGILL , ROLLWAY, LINK-BELT ,PEER,RHP, FLT  etc

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WebSite: www.obtbearing.com  
E-mail: obtbearing@163.com 
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