Suffixes G - K

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
GABearing for universal matching. Two bearings arranged back-to-back or face-to-face have extra light or light preload
GBBearing for universal matching. Two bearings arranged back-to-back or face-to-face have light or moderate preload
GCBearing for universal matching. Two bearings arranged back-to-back or face-to-face have moderate or heavy preload
GDBearing for universal matching. Two bearings arranged back-to-back or face-to-face have heavy preload
GEM9Filled to 70–100% with SKF LGHB 2 grease
GJNGrease with a polyurea thickener of consistency 2 to the NLGI Scale for a temperature range –30 to +150 °C (normal fill grade)
GMMOpen single direction bearing filled with standard grease
GRLubrication groove in the outside surface, located at the side of the locking device
GWFGrease 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
H1Two lubrication holes on the thrust side of the outer ring
HACase-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
HCBearing or bearing components made of silicon nitride. For closer identification HC is followed by one of the figures explained under HA
HEBearing or bearing component of vacuum remelted steel. For closer identification HE is followed by one of the figures explained under HA
HMMartensite-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
HRPolymer ball bearing
HTGrease with a polyurea thickener of consistency 2 to 3 to the NLGI Scale for a temperature range –40 to +150 °C (normal fill grade)
HVBearing components of stainless steel, seals and flingers with food-compatible rubber, food-grade grease
ISInner ring with lubrication hole(s), the number following indicates the number of holes
ISRInner ring with annular groove and lubrication hole(s), the number following indicates the number of holes
JSheet steel cage, rolling element centred, the number following indicates a different cage design
JASheet steel cage, outer ring centred
JBSheet steel cage, inner ring centred
JHASheet steel cage, hardened, outer ring centred
JRSheet steel cage, unhardened, riveted together
JWSheet steel cage, unhardened, welded
K
  1. Tapered bore, taper 1:12
  2. Cylindrical roller and cage thrust assembly
  3. Polymer ball bearings with components made of Polyvinylidene fluoride (PVDF)
K30Tapered bore, taper 1:30
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