SKF bearings type meaning
B4--surface of the bearing rings and roller surface treated (filled roller bearings).
EC--bearing internal geometry improved, has a higher carrying capacity, flange and roller end with good contact and lubrication conditions, can withstand high axial load.
(2) external design
CA,CB,CC--universal paired single row angular contact ball bearings, can be arbitrary (in-line, and face-to-face or back-to-back) matching installation. When arranged back-to-back or face-to-face, with normal axial internal clearance before mounting: small (CA), normal (CB), large (CC).
-2F--spherical ball bearings at both sides and throw dust ring.
-2FF--combination of insert ball bearings at both sides and throw dust ring.
G--universal paired single row angular contact ball bearings. When arranged face-to-face or back-to-back, bearing a certain preload before mounting.
GA--face-to-face, when back-to-back arrangement, bearing preload is relatively light.
GB--face-to-face, when back-to-back arrangement, moderate preload in the bearing.
GC--face-to-face, when back-to-back arrangement, heavier preload in the bearing.
K--tapered bore, taper 1:12.
K30--tapered bore, taper 1:30.
-LS--bearings with contact seals, inner ring without seal recesses.
-2LS--LS seal on both sides of the bearing.
N--there is a snap ring on the outer ring of the bearing.
NR--there is a snap ring on the outer ring of the bearing and snap ring.
N2--on the outer ring diameter of chamfer has two directions opposite notch.
PP--bearing (roller bearings, cam bearings)-contact seal on both sides.
RS--bearing (bearings) with synthetic rubber or polyurethane-contact seals.
-RS1--bearings with lining plate of synthetic rubber contact seals.
-2RS1--bearings have RS1 seals on both sides.
-2RS--bearing (bearings) have RS sealed on both sides.
-RZ--bearings with low-friction seal of the lining plate of synthetic rubber.
-2RZ--bearings have RZ sealed on both sides.
X--1. basic dimensions to conform to the ISO standard, as amended; 2. cylindrical rolling surfaces (roller bearings, cam bearings).
Z--bearings with shields (non-friction sealing).
-2Z--bearings with shields on both sides.
-ZN--bearings with shields, and on the other there is a snap ring on the outer ring.
-2ZN--bearings with shields on both sides, and snap ring groove in the outer ring.
-2NR--with-ZN, and with a snap ring.
-2ZNR--with -2ZN, and with a snap ring.
(3) cage
In order to show that the bearing cage guide way cage after the reset codes may be added after the letter a or b. A cage by the outer ring centred; b cages guided by inner ring. Not indicated by the roller centred cage.
Example: MA--mechanisms of brass cage, outer ring centred.
Cage post codes can be added after figure represents a different design or materials.
Example; TN9--cage of glass fibre reinforced polyamide 6.6-mode.
F--solid cage made of steel or special cast iron.
J--pressed window-type steel cages.
M--light alloy solid cages.
MP--of solid cage of brass.
P--cage of polyamide 6.6 glass fiber mold injection.
TN--cage of engineering plastic mold injection.
Y--copper stamping cages.
V--full complement bearings (without cage).
VH--consists of non-separating roller assemblies of full complement bearings (cylindrical roller bearings).
(3) other characteristics
1) tolerance class
/CLN--is equivalent to 6X the ISO tolerance grades, for metric tapered roller bearings (width tolerance is reduced).
/CL0--is equivalent to ISO0 tolerances, for inch tapered roller bearings.
/CL3--equivalent to the ISO3 tolerances, for inch tapered roller bearings.
/CL7A--meet the criteria of differential bearings tapered roller bearings.
/CL7C--meet the special differential bearings standard tapered roller bearings.
/P4--and running accuracy in accordance with ISO4 tolerances (precision than P5).
/P4A--dimensional accuracy tolerance ISO4, running accuracy equivalent to the AFBMA standard ABEC9.
/P5--size rotate accuracy tolerance ISO5 (accuracy better than P6).
/PA9A--dimensional and running accuracy corresponds to AFBMA standard ABEC9.
/PA9B--dimensional accuracy corresponding to AFBMA standard ABEC9, high rotation precision PA9A.
/SP--dimensional accuracy approximately to P5 running accuracy approximately to P4.
/UP--dimensional accuracy approximately to P4, running accuracy better than P4.
2) bearing clearance
/C1--clearances comply with 1 standard group, clearance is less than 2.
Comply with 2 sets of standard/C2--clearance, clearance is less than 0.
/C0--clearance in line with standard 0 group omitted from the code, does not mean that.
SKF bearing type meaning
/C3--clearances comply with 3 sets of standards, clearance is greater than 0.
Comply with the standard 4/C4--clearance groups, clearance greater than 3 groups.
/C5--clearances comply with 5 standard group, clearance greater than 4 groups.
When the clearance codes when combined with bearing tolerance class code P4,P5 or P6, clearance code c saves.
Example: P6+C2=P62
3) special technical requirements.
/Q--best internal geometry and surface roughness (for tapered roller bearings).
/Q66--standard of vibration level is less than normal, standard of vibration peak less than normal.
/QE5--to meet special standards for motor, dimensional and running accuracy to P6. extremely low noise.
/QE6--meet the standards for motor, low noise.
4) bearings.
/DB--two paired single row deep groove ball bearings, single row angular contact ball bearings or tapered roller bearings in back-to-back pairs. DB size after the number to indicate the axial clearance or preload during installation.
A--light preload (angular contact ball bearing).
B--preload than a large (angular contact ball bearing).
C--preload bigger than b (angular contact ball bearing).
CA--internal clearance smaller (deep groove or angular contact ball bearings).
CB--internal clearance than CA (deep groove or angular contact ball bearings).
CC--internal clearance than CB (deep groove ball bearings).
CG--"zero" clearance (tapered roller bearings).
C...--Special axial internal clearance behind the CC number to indicate size axial clearance.
GA--light preload (deep groove ball bearings).
GB--preload is larger than CA (deep groove ball bearings).
G...--Special preload (g digital preload size later).
Example: 6208/DBGA--represents two back to back installation with mild load 6,208-type deep groove ball bearings.
/DF--two paired single row deep groove ball bearings arranged face-to-face, single row angular contact ball bearings or tapered roller bearings. DF can be followed with the same DB after letters.
/DT--two-line arranged pairs of deep groove ball bearings, single row angular contact ball bearings or tapered roller bearings.
5) heat treatment. Bearing rings dimensionally stabilized within and outside processing, can be run at the following temperatures:
/S0--up to 150 degrees Celsius.
/S1--up to 200 degrees Celsius.
/S2--up to 250 degrees Celsius.
/S3--up to 300 degrees Celsius.
/S4--up to 350 degrees Fahrenheit.
6) lubricants added.
/W--cannot add lubricant (no lubrication groove and holes).
/W20--bearing with three lubrication holes in the outer ring.
Three oil/W33--bearing outer ring with lubrication slots and holes.
Six oil/W33X--bearing outer ring with lubrication slots and holes.
7) lubricant. Used to identify the type of fill the bearing grease post code is composed of a group of letters and two numbers, letters to indicate temperature range, followed by two numbers represents the actual grease used, common letter groups are as follows:
/HT--high temperature grease (-20 degrees ~+130 degrees Celsius).
/LHT--low/high temperature grease (-40 degrees ~+140 degrees Celsius).
/LT--oil at low temperature (-50 degrees ~+80 degrees Celsius).
/MT--medium temperature grease (-30 degrees c ~ 110 deg c).
MT post code represents a particular bearing non-standard grease. Dosage and standard padding amount of grease in the bearing (bearing internal free space 25%~30%) is not the same as identified by an additional letter:
A: amount less than the standard amount of grease.
B: grease quantity is greater than the standard amount.
C: grease consumption is greater than b.
Example: 6210-2Z/HT51B--with two shields of 6,210-deep groove ball bearing, fat consumption than his standard fill the amount of post code that can be used for high temperature.
8) other features. The letter v, and another letter (VA) combined with the three numbers to identify post codes cannot use other existing variants of the standard design of the expression. Such as:
/VA201--kiln car bearings.
/VA301--cylindrical roller bearings for traction motors.



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