Swedish SKF Bearings code summary

(1) interior design
ACD - contact angle of 25 degrees.
B - contact angle of 40 degrees.
CC - a contact angle of 12 degrees.
CD - contact angle of 15 degrees.
BE - contact angle of 40 degrees BE-type bearings, ball up, with glass fiber reinforced polyamide 6.6 cage.
Double row angular contact ball bearings
A - 90 mm outer diameter less than or equal bearing of standard design, are not equipped with the ball gap, glass fiber reinforced polyamide 6.6 cage.
E - loaded ball bearing side of the mouth can be installed more balls, so with high radial and axial load capacity.
Spherical Roller Bearings
CAC, ECAC, CA, ECA - those designed for large size bearings, roller symmetrical type.
CC, C, EC - such was symmetrical roller bearings, inner ring without ribs.
E - is the latest standard design company SKF. E-type bearing outer ring with a tank and three hole, the post code to be added in the W, to show distinction.
Cylindrical Roller Bearings
B - surface-treated bearing roller (filled roller bearings).
B4 - Roller Bearing surfaces and surfaces treated (filled roller bearings).
EC - bearing internal geometry, improved, higher carrying capacity, ribs, and roller end contacts and good lubricating conditions, can withstand high axial loads.
(2) external design
CA, CB, CC - Universal matching single row angular contact ball bearings, can be arbitrary (in series, face to face or back to back) matching installation. Back to back or face to face arrangement, the axial internal clearance before installation, and normal ratio: small (CA), normal (CB), large (CC).
-2F - insert ball bearings on both sides of the dust ring with rejection.
-2FF - insert ball bearings on both sides of the dust ring with a combination of rejection.
G - General Matching single row angular contact ball bearings. Face to face or back to back arrangement, the bearings before installation within a certain pre-load.
GA - face to face, back to back arrangement, the bearing preload with a lighter.
GB - face to face, back to back arrangement, the bearing pre-load moderate.
GC - face to face, back-alignment, bearing a heavy pre-load.
K - Tapered bore, taper 1:12.
K30 - tapered bore, taper 1:30.
-LS - side bearing with contact seals, no inner seal groove.
-2LS - bearing sealed on both sides with LS.
N - bearing outer ring on a groove.
NR - bearing outer ring on a groove and a snap ring.
N2 - There are two chamfered outer diameter direction relative notch.
PP - bearing (bearing roller bearings, cam follower bearing) with contact seals on both sides.
RS - bearing (needle bearing) side of a synthetic rubber or polyurethane-contact seal.
-RS1 - bearing side plate has a rubber lining contact seals.
-2RS1 - bearing sealed on both sides with RS1.
-2RS - Bearings (needle bearings) sealed on both sides with the RS.
-RZ - bearing side lining plate with low-friction synthetic rubber seal.
-2RZ - bearing sealed on both sides with RZ.
X - 1. Basic dimensions, as amended, in line with ISO standards; 2. Cylindrical rolling surface (bearing roller bearings, cam follower bearing).
Z - bearing side with the dust cover (non-friction seal).
-2Z - bearing both sides with dust cover.
-ZN - bearing side with the dust cover, the other side of the outer ring has groove.
-2ZN - bearing both sides with dust cover, the outer ring has groove.
-2NR - with-ZN, and with a stop ring.
-2ZNR - with-2ZN, and with a stop ring.
  (3), Cage
In order to show that the bearing cage guide way, the post holder may be added after the code letter A or B.
A said cage from the outer boot;
B said cage from the inner guide. No representation cage guided by the ball.
F - special cast iron, steel or solid cage.
J - steel stamping cage.
M - light alloy solid cage.
MP - solid brass cage.
P - Glass Fiber Nylon 6.6 injection mold cage.
TN - plastic mold injection cage.
Y - copper metal forming cage.
V - full roller bearings (no cage).
VH - Separate from the non-roller assembly consisting of full roller bearings (cylindrical roller bearings).
(3) Other features
1) Tolerance class
/ CLN - equivalent to ISO tolerance class 6X, for the metric tapered roller bearings (width tolerances are lower).
/ CL0 - the equivalent of ISO0 level tolerances for inch tapered roller bearings.
/ CL3 - the equivalent of ISO3 level tolerances for inch tapered roller bearings.
/ CL7A - consistent with the differential bearing configuration standard tapered roller bearings.
/ CL7C - meet the standard differential bearing configuration special tapered roller bearings.
/ P4 - size and rotation accuracy level consistent with ISO4 tolerance (precision than P5).
/ P4A - ISO4 level tolerance consistent dimensional accuracy, rotation accuracy equivalent to the standard ABEC9 AFBMA level.
/ P5 - Size rotation accuracy level consistent with ISO5 Tolerance (accuracy is higher than P6).
/ PA9A - size and rotation accuracy equivalent to the standard ABEC9 AFBMA level.
/ PA9B - dimensional accuracy equivalent to the standard ABEC9 AFBMA, rotation accuracy is higher than PA9A.
/ SP - dimensional accuracy of about P5, rotation accuracy is about P4.
/ UP - dimensional accuracy of about P4, rotation accuracy is higher than P4.
2) bearing clearance
/ C1 - Clearance of the standard provisions of a group, clearance was less than 2 groups.
/ C2 - Clearance meet the standard requirements of the two groups, group clearance is less than 0.
/ C0 - Clearance of the standard requirements of the 0 group, code-named the omission, does not mean that.
/ C3 - Clearance meet the standard requirements of the 3 groups, clearance is greater than 0 groups.
/ C4 - Clearance meet the standard requirements of the 4 groups, clearance greater than 3 groups.
/ C5 - Clearance meet the standard requirements of the 5 groups, clearance than 4 groups. When the bearing clearance tolerance level code and code P4, P5 or P6 when combined, clearance code C can be omitted. Cases: P6 + C2 = P62 3) special technical requirements.
/ Q - the best internal geometry and the surface roughness (for tapered roller bearings).
/ Q66 - less than the ordinary level standard vibration level, vibration peak is less than normal standard.
/ QE5 - meet the motor with a special standard, size and rotation accuracy of P6. Very low noise.
/ QE6 - meet the standard motor and low noise.
4) bearing configuration.
/ DB - the two can be paired single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings installed in pairs back to back manner. DB digits after the size of the axial clearance or pre-load size of the installation.
A - Light Pre-load (angular contact ball bearings).
B - A large pre-load ratio (angular contact ball bearings).
C - pre-load than the B-(angular contact ball bearings).
CA - internal clearance less (deep groove or angular contact ball bearings).
CB - CA internal clearance than the large (deep groove or angular contact ball bearings).
CC - CB internal clearance than the large (deep groove ball bearing).
CG - "Zero" clearance (tapered roller bearings).
C ... - CC special axial internal clearance behind the numbers indicate the size of the axial clearance.
GA - less pre-load (deep groove ball bearing).
GB - pre-load is greater than CA (deep groove ball bearing).
G ... - special pre-load (G behind the numbers indicate the size of pre-load).
/ DF - Two separate pairs, arranged in face to face, deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings. DF and DB back to after with the same letters.
/ DT - Two pairs, arranged in series deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings.
5) heat treatment. Inside and outside the ring bearing size after stabilization, the temperature in the following run:
/ 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 added.
/ W - can not add oil (no oil tank and the 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) lubricants. Bearing grease used to identify the type of post-filled by a letter code group and the two numbers, letters, said temperature range, the next two numbers indicate the actual use of grease, common letter groups as follows:
/ HT - high temperature grease (-20 degrees C ~ +130 degrees Celsius).
/ LHT - low / high temperature grease (-40 degrees C ~ +140 degrees Celsius).
/ LT - low temperature grease (-50 degrees C ~ +80 degrees Celsius).
/ MT - Medium Temperature Grease (-30 degrees Celsius to 110 degrees Celsius).
MT Post code said a particular non-standard bearing grease. Amount of bearing grease filled with the standard amount (bearing the internal free space of 25% to 30%), different time, by an additional letter identification:
A: amount less than the standard amount of grease.
B: grease content than the standard amount.
C: grease content was larger than B.
8) other features. Letter V and the other letters (such as VA) and three digital portfolio can not be used to identify the existing code of other post-expression variant of the standard design. Such as:
/ VA201 - kiln car bearings.
/ VA301 - traction motor with a cylindrical roller bearings.

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