1) Internal design
ACD-The contact angle is 25 degrees.
B-The contact angle is 40 degrees.
CC——The contact angle is 12 degrees.
CD-The contact angle is 15 degrees.
BE——BE type bearing with a contact angle of 40 degrees, with enlarged steel balls and glass fiber reinforced nylon 6.6 cage.
Double row angular contact ball bearings
A-The standard design of the bearing with an outer diameter less than or equal to 90 mm, without a ball notch, adopts a glass fiber reinforced nylon 6.6 cage.
E-There is a ball opening on one side of the bearing, which can hold more steel balls, so it has a higher radial and axial load-bearing capacity.
Spherical roller bearing
CAC, ECAC, CA, ECA-these are designed for large-size bearings, and the rollers are symmetrical.
CC, C, EC-this type of bearing rollers are symmetrical, and the inner ring has no ribs.
E-is SKF company adopts the latest standard design. The outer ring of E-type bearing has an oil groove and three oil holes, and W must be added to the rear code to show the difference.
Cylindrical Roller Bearings
B-The bearing adopts surface-treated rollers (full complement roller bearings).
B4——The surface of the bearing ring and the surface of the roller are treated (full complement roller bearing).
EC-The internal geometry of the bearing has been improved, and it has a higher load carrying capacity. The ribs and roller end faces have good contact and lubrication conditions, and can withstand higher axial loads.
(2) External design
CA, CB, CC-universal matching single row angular contact ball bearings, which can be installed in pairs (in series, face-to-face or back-to-back). When arranged back-to-back or face-to-face, the ratio of the internal clearance before axial installation to the normal value: small (CA), normal (CB), large (CC).
-2F-The outer spherical ball bearing has dust retaining rings on both sides.
-2FF——The outer spherical ball bearing is equipped with a combined dust retaining ring on both sides.
G——Universal paired single row angular contact ball bearings. When arranged face-to-face or back-to-back, there is a certain preload in the bearing before installation.
GA-face to face, back to back arrangement, there is a lighter preload in the bearing.
GB-face to face, back to back arrangement, there is a medium preload in the bearing.
GC——When arranged face to face and back to back, there is a heavier preload in the bearing.
K-conical hole, taper 1:12.
K30-conical hole, taper 1:30.
-LS——The bearing has a contact seal on one side, and the inner ring has no seal groove.
-2LS——LS seals on both sides of the bearing.
N-There is a stop groove on the outer ring of the bearing.
NR-There is a stop groove and a stop ring on the outer ring of the bearing.
N2——There are two diametrically opposite notches on the chamfer of the outer ring.
PP-bearing (support roller bearing, cam follower bearing) has contact seals on both sides.
RS——The bearing (needle roller bearing) has a synthetic rubber or polyurethane contact seal on one side.
-RS1——One side of the bearing has a steel lined synthetic rubber contact seal.
-2RS1——RS1 seals on both sides of the bearing.
-2RS——The bearing (needle roller bearing) has RS seals on both sides.
-RZ——The bearing has a low-friction seal with steel lined synthetic rubber on one side.
-2RZ——RZ seals on both sides of the bearing.
X-1. The basic dimensions have been revised to meet ISO standards; 2. Cylindrical rolling surfaces (support roller bearings, cam follower bearings).
Z-There is a dust cover on one side of the bearing (non-friction seal).
-2Z-There are dust covers on both sides of the bearing.
-ZN——The bearing has a dust cover on one side and a stop groove on the outer ring on the other side.
-2ZN——The bearing has dust cover on both sides, and the outer ring has a stop groove.
-2NR——Same as -ZN, with a stop ring.
-2ZNR——same as -2ZN, and with a stop ring.
(3) Cage
In order to indicate the guiding mode of the cage in the bearing, the letter A or B can be added after the rear code of the cage. A indicates that the cage is guided by the outer ring; B indicates that the cage is guided by the inner ring. The cage without indication is guided by rolling elements.
F——Steel or special cast iron solid cage.
J——Steel stamping forming cage.
M-Light alloy solid cage.
MP-brass solid cage.
P——Glass fiber nylon 6.6 injection molded cage.
TN——Engineering plastic injection molding cage.
Y——Copper plate stamping forming cage.
V-full roller bearing (without cage).
VH-a full complement bearing (cylindrical roller bearing) composed of non-separable roller assemblies.
(4) Other characteristics
1) Tolerance class
/CLN——Equivalent to ISO tolerance grade 6X, used for metric tapered roller bearings (the width tolerance is reduced).
/CL0——Equivalent to ISO0 tolerance, used for inch tapered roller bearings.
/CL3——Equivalent to ISO3 tolerance, used for inch tapered roller bearings.
/CL7A——Tapered roller bearing conforming to the standard of differential bearing configuration.
/CL7C——Tapered roller bearing that meets the special standards of differential bearing configuration.
/P4——The size and rotation accuracy meet the ISO4 tolerance (precision than P5).
/P4A——The dimensional accuracy meets the ISO4 tolerance, and the rotation accuracy is equivalent to the AFBMA standard ABEC9.
/P5——The dimensional rotation accuracy meets the ISO5 tolerance (precision is higher than P6).
/PA9A——The size and rotation accuracy are equivalent to AFBMA standard ABEC9.
/PA9B——The dimensional accuracy is equivalent to ABEC9 of the AFBMA standard, and the rotation accuracy is higher than that of PA9A.
/SP——The dimensional accuracy is about P5, and the rotation accuracy is about P4.
/UP——The dimensional accuracy is about P4, and the rotation accuracy is higher than P4.
2) Bearing clearance
/C1——The clearance meets the standard requirement of 1 group, and the clearance is less than 2 groups.
/C2——The clearance conforms to the 2 groups specified by the standard, and the clearance is less than 0 group.
/C0——The clearance conforms to the 0 group specified by the standard, and the code is omitted and it is not indicated.
/C3——The clearance conforms to the 3 groups specified by the standard, and the clearance is greater than 0 group.
/C4——The clearance conforms to the 4 groups specified by the standard, and the clearance is greater than 3 groups.
/C5——The clearance conforms to the 5 groups specified by the standard, and the clearance is greater than 4 groups.
When the clearance code is combined with the bearing tolerance class code P4, P5 or P6, the clearance code C can be omitted.
Example: P6+C2=P62
3) Special technical requirements.
/Q——The best internal geometry and surface roughness (for tapered roller bearings).
/Q66——The vibration level is less than the ordinary level standard, and the vibration peak value is less than the ordinary level standard.
/QE5——Meet the special standards for motors, with size and rotation accuracy up to P6. Very low noise.
/QE6——Comply with motor standards, low noise.
4) Bearing configuration.
/DB-Two pairable single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings are installed in pairs in a back-to-back manner. The number after DB indicates the size of the axial clearance or the size of the preload during installation.
A-Light preload (angular contact ball bearing).
B——The preload is larger than A (angular contact ball bearing).
C——The preload is larger than B (angular contact ball bearing).
CA-small internal clearance (deep groove or angular contact ball bearings).
CB-larger internal clearance than CA (deep groove or angular contact ball bearings).
CC——The internal clearance is larger than CB (deep groove ball bearing).
CG-”zero” clearance (tapered roller bearing).
C…——Special axial internal clearance The number behind CC indicates the axial clearance.
GA-lighter preload (deep groove ball bearing).
GB-Preload is greater than CA (deep groove ball bearing).
G…——Special preload (the number after G indicates the size of the preload).
/DF-Two paired single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings arranged in a face-to-face manner. DF can be followed by the same letter as DB.
/DT-Two paired deep groove ball bearings arranged in tandem, single row angular contact ball bearings or single row tapered roller bearings.
5) Heat treatment. The dimensions of the inner and outer rings of the bearing have been stabilized and can operate 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) Replenishment of lubricant.
/W——Cannot replenish lubricating oil (no lubricating oil groove and oil hole).
/W20——There are three lubricating holes in the outer ring of the bearing.
/W33——The outer ring of the bearing has a lubricating oil groove and three oil holes.
/W33X——There are lubricating oil grooves and six oil holes on the outer ring of the bearing.
7) Lubricant. The post code used to identify the type of grease filled in the bearing consists of a letter group and two numbers. The letter represents the temperature range, and the last two numbers represent the actual grease used. Common letter groups are 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——Medium temperature grease (-30 degrees Celsius to 110 degrees Celsius).
The MT postcode indicates that the specific bearing uses non-standard grease. When the amount of grease in the bearing is different from the standard filling amount (25%~30% of the free space inside the bearing), it is identified by an additional letter:
A: The amount of grease is less than the standard amount.
B: The amount of grease is greater than the standard amount.
C: The amount of grease is greater than B.
8) Other characteristics. The letter V and another letter (such as VA) are combined with three numbers to identify variants of the standard design that cannot be expressed by other existing postcodes. like:
/VA201-kiln car bearing.
/VA301-Cylindrical roller bearings for traction motors.
Post time: Nov-08-2021