SKF bearing code

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- type of-BE bearing with a contact angle of 40 degrees, the steel ball is enlarged, and the glass fiber reinforced nylon 6.6 is used as cages.

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 filling ball notch, and the glass fiber reinforced nylon 6.6 cage is adopted.

E--There is a filling ball notch 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 kind of bearing rollers are symmetrical, and there is no ribs in the .inner ring.

E--is SKF Company adopts the latest standard design. There is an oil groove and three oil holes

In ring of E-type of bearing and W must be added to the post code to show the difference.

Cylindrical Roller Bearings 

B--The bearing adopts surface-treated rollers (full complement roller bearings).

B4--Bearing ring surface and roller surface are treated (full complement roller bearing).

EC--The internal geometry of the bearing has been improved to have a higher loading capacity, and he ribs and roller end faces have good contact and lubrication conditions and can withstand higher axial loads.

CA, CB, CC--universal matched 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 It is arranged by face-to-face or back-to-back, there is a certain preload in the bearing before installation.

GA-face to face, or back to back arrangement, there is a lighter preload on the bearing.

GB-face to face, or back to back arrangement, there is a medium preload on the bearing.

GC-- when it is arranged by face to face, or back to back, there is a heavier preload on the bearing,

K--cone bore, taper 1:12.

K30- cone bore, taper 1:30.

-LS--the bearing has a contact seal on one side and has none of, seal groove on the inner ring.

-2LS—the bearing has LS seals on both sides. 

N-- A stop groove is arranged on the outer ring of the bearing.

NR- a stop groove and a stop ring are arranged on the outer ring of the bearing

N2--there are two opposite notches in diametrical direction on the chamfer of the outer ring.

PP--Bearing (support roller bearing, cam follower bearing), there are contact seals on both sides of the bearing.

RS--Bearing (needle roller bearing), there is a synthetic rubber or polyurethane contact seal on one side.

-RS1—there is a contact seal with steel lined synthetic rubber on one side of the bearing

-2RS1—there are RS1 seals on both sides of the bearing.

-2RS--Bearing (needle roller bearing) has RS seals on both sides.

-RZ—There is a low-friction seal with steel lined synthetic rubber on one side of the bearing

-2RZ--RZ seals on both sides of the bearing.

X--1. The basic dimensions have been revised to comply with ISO standards;

2, Cylindrical shape rolling surface (support roller bearing, cam follower bearing).

Z—there is a dust cover (non-friction seal) on one side of the bearing

-2Z—there is a dust cover on both sides of the bearing.

-ZN—there is a dust cover on one side and a stop groove on the outer ring on the other side of a bearing

-2ZN-- there is a dust cover on both sides of the bearing, and a stop groove on the outer ring

-2NR—the same design as -ZN, and with a stop ring. 

-2ZNR—the same design as -2ZN, and with a stop ring. 

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 nonrepresentational cage 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 mold cage.

TN--engineering plastic injection mold cage.

Y--Copper sheet stamping forming cage.

V- full roller bearing (without cage).

VH-full roller bearing (cylindrical roller bearing) composed of non-separable roller assemblies.

1) Tolerance class

/CLN--equivalent to ISO tolerance class 6X, used for metric tapered roller bearings (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 that meets the differential bearing configuration standard.

/CL7C--Tapered roller bearings that meet the special standards of differential bearing configuration.

/P4--Dimension and rotation accuracy conform to ISO4 tolerance (accuracy than P5).

/P4A--The dimensional accuracy meets the ISO4 tolerance, and the rotation accuracy is equivalent to the AFBMA standard ABEC9.

/P5--Dimensional rotation accuracy meets ISO5 tolerance (accuracy 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 accords with the standard stipulation 1 group, the clearance is less than 2 groups.

/C2--The clearance meets 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. 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--optimal internal geometry and surface roughness (for tapered roller bearings).

/Q66--The vibration level is less than the normal level, and the vibration peak is less than the ordinary level.

/QE5--Comply with special standards for motors, size and rotation accuracy up to P6. With a lower noise.

/QE6--Comply with motor standards, lower 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--small preload (angular contact ball bearing).

B--The preload is larger than A (angular contact ball bearings).

C--The preload is larger than B (angular contact ball bearings).

CA-small internal clearance (deep groove or angular contact ball bearings).

CB--The internal clearance is larger 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...--The number behind the special axial internal clearance CC indicates the axial clearance.

GA-smaller 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 pairs of deep groove ball bearings arranged in series, 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--The outer ring of the bearing has a lubricating oil groove and six oil holes.

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 post code indicates the uses of non-standard grease for specific bearing. 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. Such as:

/VA201--Kiln car bearing.

/VA301--Cylindrical roller bearings for traction motors.