An internal structure
A– different interior design and standard bearings.
A– angular contact ball bearings, the contact angle of 30 degrees.
A5– angular contact ball bearings, the contact angle of 25 degrees.
B– angular contact ball bearings, the contact angle of 40 degrees.
C– angular contact ball bearings, the contact angle of 15 degrees.
C– tapered roller bearings, the contact angle of 20 degrees.
D– tapered roller bearings, the contact angle of 28 degrees.
C, CA (with a solid brass cage), CD (with stamping cage) – high load-aligning roller bearings.
E– high load Cylindrical roller bearings.
H– high load thrust-aligning roller bearings.
J– tapered roller bearing outer ring raceway small end diameter, angle, outer ring width is consistent with ISO regulations.

II. Material
g– rings, rolling elements of hardened steel.
H– rings, rolling elements made of stainless steel.

Three. Cage
M– copper alloy solid cage.
T– synthetic resin cage.
W– stamping cage.
V– no cage.

IV. Seals, shields
Z, ZS– side with steel dust cover.
ZZ, ZZS– both sides with steel dust cover.
D, DU– side with a contact rubber seals.
DD, DDU– both sides with a contact rubber seals.
V– side with a non-contact rubber seals.
VV– both sides with a non-contact rubber seals.

V. collar shape
K– tapered bore, taper 1:12.
K30– tapered bore, taper 1:30.
E– rings on a cut or hole.
Tanker, E4– hole on the outer ring.
N– outer diameter with a stopper groove.
NR– outer diameter with snap groove, snap ring.

VI. Cooperation and liner
DB– installed in pairs back to back.
DF– face to face in pairs.
DT– series installed in pairs.
+ K– outer ring with liner.
+ L– inner padded.
+ KL– inner and outer rings with a liner.
VII. Clearance
C1– Radial Bearing radial clearance, clearance smaller than C2 swim.
C2– radial bearings radial clearance, smaller than the standard clearance.
CN (omitted) – Standard Radial Bearing radial clearance.
C3– Radial Bearing radial clearance, clearance larger than the standard.
C4– Radial Bearing radial clearance, clearance larger than C3.
C5– Radial Bearing radial clearance, clearance larger than C4.
CC1– cylindrical roller bearings (not interchangeable) radial clearance, smaller than the CC2 clearance.
CC2– cylindrical roller bearings (not interchangeable) radial clearance, smaller than the standard clearance.
CC– cylindrical roller bearings (not interchangeable) standard radial clearance.
CC3– cylindrical roller bearings (not interchangeable) radial clearance, clearance larger than the standard.
CC4– cylindrical roller bearings (not interchangeable) radial clearance, clearance larger than CC3.
CC5– cylindrical roller bearings (not interchangeable) radial clearance, clearance larger than CC4.
MC1– small, miniature ball bearing radial clearance, clearance smaller than MC2.
MC2– small, miniature ball bearing radial clearance, clearance smaller than the MC3.
MC3– small, miniature ball bearing radial clearance standard clearance.
MC4– small, miniature ball bearing radial clearance, clearance larger than the MC3.
MC5– small, miniature ball bearing radial clearance, clearance larger than the MC4.
MC6– small, miniature ball bearing radial clearance, clearance larger than the MC5.
CM– motor with deep groove ball bearings, cylindrical roller bearings radial clearance.
CT– motors with cylindrical roller bearing radial clearance.

VIII. Tolerance Level
P0 (omitted) – tolerance levels comply with JIS standards for 0.
P6– tolerance levels comply with JIS standards for six.
P6X– tolerance levels comply with JIS standards for class 6X.
P5– tolerance class in accordance with 5 JIS standards.
P4– tolerance class in accordance with 4 JIS standards.
P2– tolerance levels comply with JIS standards for two.

IX. Special specifications
X26– use temperature limit of 150 degrees Celsius.
X28– temperature limit of 200 degrees Celsius.
X29– use temperature is limited to 250 degrees Celsius.
S11– aligning roller bearings, temperature limit of 200 degrees Celsius.
Swedish SKF brand

A. Interior design
ACD– contact angle of 25 degrees.
B– contact angle of 40 degrees.
CC– contact angle of 12 degrees.
CD– contact angle of 15 degrees.
BE– BE-bearing contact angle of 40 degrees, the ball increase in glass fiber reinforced polyamide 6.6 cage.
v double row angular contact ball bearings
A– outer diameter less than or equal to 90 mm standard bearing design, no ball gap, the use of glass fiber reinforced polyamide 6.6 cage.
E– ball bearing on one side the mouth, it can be installed more balls, so it has high radial and axial load carrying capacity.
v Spherical Roller Bearings
CAC, ECAC, CA, ECA– these bearings are designed for large-sized, the roller symmetrical type.
CC, C, EC– these bearings roller symmetrical type, no inner wall.
E– SKF company is using the latest standards. E-type bearing outer ring with oil groove and three hole, the post code to be added in W, to show the difference.
v Cylindrical Roller Bearings
B– bearing surface-treated rollers (full complement cylindrical roller bearings).
B4– bearing rings and roller surfaces are surface treated (filled roller bearings).
EC– bearing internal geometry improved, a higher carrying capacity, ribs and roller end faces have good contact and lubrication conditions, can withstand high axial loads.

II. External design
CA, CB, CC– Universal matching row angular contact ball bearings, can be arbitrary (series, face to face or back to back) paired mounting. Back to back or face to face arrangement, the axial internal clearance before installation and normal ratio: Small (CA), normal (CB), large (CC).
-2F– Spherical ball bearings on both sides dust ring with rejection.
-2FF– Spherical ball bearings on both sides with a combination of rejection of the dust ring.
G– General paired single row angular contact ball bearings. When face to face or back to back arrangement, the bearing pre-load before certain installation.
GA– face to face, back to back arrangement, there is a lighter bearing preload.
GB– face to face, back to back arrangement, bearing a moderate preload.
GC– face to face, back to back arrangement, the bearing a heavier preload.
K– tapered bore, taper 1:12.
K30– tapered bore, taper 1:30.
-LS– Bearing side having contact seals, no inner seal groove.
-2LS– Bearing on both sides with a seal LS.
N– stopper groove bearing outer ring.
There NR– bearing outer snap groove and a snap ring.
There are two diametrically opposite directions notches on the outer ring chamfer N2–.
PP– bearing (bearing roller bearings, cam follower bearings) on both sides with a contact seal.
RS– bearing (needle bearing) side of a synthetic rubber or polyurethane contact seal.
-RS1– Bearing side with a backing plate synthetic rubber contact seal.
-2RS1– Bearings have RS1 seals on both sides.
-2RS– Bearings (needle bearings) on both sides with RS seal.
-RZ– Bearing side with a synthetic rubber lined steel low friction seal.
-2RZ– Bearings have RZ seals on both sides.
X– basic dimensions amended to comply with ISO standards; cylindrical rolling surface (bearing roller bearings, cam follower bearings).
Z– bearing side with a dust cover (non-friction seal).
-2Z– Bearing on both sides with a dust cover.
-ZN– Bearing side with a dust cover, with snap groove on the other side of the outer ring.
-2ZN– Bearing on both sides with a dust cover, with snap groove on the outer ring.
-2NR– With -ZN, and with a snap ring.
-2ZNR– With -2ZN, and with a snap ring.

Three. Cage
In order to show the bearing cage guide the way, after the holder of the post code can add the letters A or B. A represents a cage guided by the outer ring; B represents the cage from the inner guide. No representation cage guided by the rolling elements.
F– steel or special cast iron solid cage.
J– steel stamping cage.
M– light alloy solid cage.
MP– solid brass cage.
P– glass fiber nylon 6.6 injection molded retainer.
TN– plastic molding cage.
Y– copper stamping cage.
V– full roller bearings (without cage).
VH– roll by a non-separable sub-assemblies consisting of full roller bearings (cylindrical roller bearings).

IV. Other features
1. The tolerance level
/ CLN– equivalent to ISO tolerance class 6X, for metric tapered roller bearings (width tolerance has decreased).
/ CL0– equivalent ISO0 grade tolerances for inch tapered roller bearings.
/ CL3– equivalent ISO3 grade tolerances for inch tapered roller bearings.
/ CL7A– accord differential bearing configuration standard tapered roller bearings.
/ CL7C– accord differential bearing configured a special standard tapered roller bearings.
/ P4– size and rotation accuracy level consistent with ISO4 tolerance (than P5 accuracy).
/ P4A– size accuracy to tolerance class ISO4 rotation accuracy equivalent AFBMA standard ABEC9 level.
/ P5– size rotation accuracy level consistent with ISO5 tolerance (accuracy better than P6).
/ PA9A– size and rotation accuracy equivalent AFBMA standard ABEC9 level.
/ PA9B– dimensional accuracy equivalent AFBMA standard ABEC9 level, rotation accuracy is higher than PA9A.
/ SP– dimensional accuracy of about P5, rotational accuracy of about P4.
/ UP– dimensional accuracy of about P4, rotational accuracy better than P4.
2. bearing clearance
/ C1– Clearance meet the standard requirements of a group, the clearance is less than 2 groups.
/ C2– Clearance meet the standard requirements of the two groups, clearance is less than 0 groups.
/ C0– Clearance meet the standard requirements of the 0 group, code omitted, no representation.
/ C3– Clearance meet the standard requirements of the three groups, clearance greater than 0 groups.
/ C4– Clearance meet the standard requirements of the four groups, clearance greater than 3 groups.
/ C5– Clearance meet the standard requirements of the five groups, clearance greater than 4 groups.
When combined with the clearance code bearing tolerance class code P4, P5 or P6, clearance code C can be omitted.
Example: P6 + C2 = P62
3. The special technical requirements
/ Q– optimum internal geometry and surface roughness (for tapered roller bearings).
/ Q66– vibration level is less than the ordinary standard, the vibration peak less than ordinary standard.
/ QE5– in line with the motor up to P6. Very low noise with a particular standard, size and rotation accuracy.
/ QE6– comply with the standard motor, low noise.
4. The bearing arrangement
/ DB– two can be paired single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings are installed in pairs back to back manner. DB after digital representation of the size of the axial clearance preload size or installation.
A– light preload (angular contact ball bearings).
B– pre-load is greater than A (angular contact ball bearings).
Preload C– greater than B (angular contact ball bearings).
CA– internal clearance smaller (deep groove or angular contact ball bearings).
Representing CB– large internal clearance CA (deep groove or angular contact ball bearings).
CB relatively large internal clearance CC– (deep groove ball bearings).
CG– “zero” clearance (tapered roller bearings).
C … – special axial internal clearance CC behind the numbers indicate the size of the axial clearance.
GA– light preload (deep groove ball bearings).
GB– pre-load is greater than CA (deep groove ball bearings).
G … – a special pre-load (G behind the numbers indicate the size of the pre-load).
/ DF– arranged pairing two facing single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings. DF behind may be the same with the following letters DB.
/ DT– arranged in series pairing two deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings.
5. Heat treatment
Bearing inner ring size after the stabilization process 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 Celsius.
6. lubricant supplement
/ W– not add oil (no oil tank and hole).
/ W20– bearing outer ring with three lubrication holes.
/ W33– bearing outer ring with lubrication groove and three hole.
/ W33X– bearing outer ring with lubrication grooves and six hole.
7. Lubricant
Used to identify the type of bearing grease filled post code consists of a letter group with two digits, the letter indicates the temperature range, followed by two numbers grease, common letter group actually used as follows:
/ HT– high temperature grease (-20 degrees Celsius to +130 degrees Celsius).
/ LHT– low / high temperature grease (-40 degrees Celsius to +140 degrees Celsius).
/ LT– low temperature grease (-50 degrees Celsius to +80 degrees Celsius).
/ MT– oil temperature (-30 degrees Celsius to +110 degrees Celsius).
MT Post code represents the specific use of non-standard bearing grease. The amount of standard bearing grease filling amount (25% to 30% free space inside the bearing) is not the same, by an additional letter recognition:
A: Grease amount is less than the standard amount.
B: grease amount is more than the standard amount.
C: Grease amount greater than B.
8. Other characteristics
The letters V and another letter (eg VA) in combination with three digits, the standard can not be used to identify other existing post code expression of design variants. Such as: 
/ VA201– kiln car bearings.
/ VA301– traction motors with cylindrical roller bearings.

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