Which model is the bearing housing with SKF 3208A-Z bearing?

A:Bearing seat model 508.

Q2:Is there a C222 model in SKF bearing?

A:The model is short of one bit and suffix, such as C2220, the inner diameter is 100mm, the corresponding size is the same as 22220.

The C4020 pair should be fully loaded with rollers C4020V

Q3:What does SKF bearing model NU238-E-MPA-C3 mean?

A:This is a cylindrical roller bearing

The copper retainer

Designed to be enhanced

Q4:SKF bearing BT2-8166B, what does each code mean?

A:BT2-8166 /HA1 only has this code bearing

The bearing shall be double row tapered roller bearing with TDO configuration.

Q5:What is the model identification of bearings imported from Sweden?

A:SKF bearing suffixes are used to represent variants that have different structures and/or other characteristics from the basic design. When it is necessary to express the characteristics of more than one SKF bearing, the suffixes are regularly divided into several groups, arranged in the order shown in the figure above. More commonly used suffixes than SKF bearings are listed below. Note that not all variants are available:

A: A modified or slightly altered interior design. The dimensions are the same. It is usually of no significance to different types or series of bearings.

AC: SKF column angular contact ball bearings with contact Angle of 25°.

ADA: The stop groove on the outer ring has been modified, and the split inner ring is held in place by a retaining ring

B: An improved or slightly changed internal design with the same external dimensions is usually not acceptable for different types or series of bearings. For example: 7224B: single row angular contact ball bearings with a contact Angle of 40°. 32210B: tapered roller bearing with large contact Angle

Bxx(x) : B combined with a two – or three-digit number, used to represent some variants that do not have a suitable suffix. Example: B20: reduced width tolerance

C: Modified or slightly altered interior design. The dimensions are the same. It is usually of no significance to different types or series of bearings. Example: 21306C: Spherical roller bearing with two windowed stamped steel cages, inner ring without flanges and a guide ring guided by the inner ring

CA: 1. Spherical roller bearing, type C, with a forked machine-cut brass cage, inner ring flanks and a guide ring 2 guided by the inner ring. Bearings with general assembly, in back to back or face to face configuration, have less axial clearance than normal assembly (CB)

 CAC: CA type spherical roller bearing with improved roller guide

CB: 1. In the back-to-back or face to face configuration, the axial clearance is normal group 2 by matching bearings. Double row angular contact ball bearings with specific axial clearance

CC: 1, type C SKF spherical roller bearings with improved roller guidance 2. Universal set bearings with greater axial clearance than normal set (CB) in back to back or face to face configurations

CLN: Tapered roller bearings, tolerance bands for reduced ring width and total width, to ISO tolerance class 6X

CL0: Accuracy to ANSI/ABMA 19.2:1994 standard tolerance class 0, for inch tapered roller bearings

CL00: Accuracy to ANSI/ABMA 19.2:1994 standard tolerance class 00, for inch tapered roller bearings

CL3: Precision to ANSI/ABMA 19.2:1994 standard tolerance class 3, for inch tapered roller bearings

CL7C: For tapered roller bearings, with special friction characteristics and higher rotation accuracy

CN: normal group meridional clearance; Usually only used in the following letter combinations to narrow or offset the clearance range of CNH narrow scope of clearance, the first half of the group of normal clearance range CNM narrow scope of clearance, clearance of normal group half range of CNL narrow scope of clearance, the lower part of the group of normal clearance range CNP clearance range migration, The CNR is composed of the letters H, M, L and P above cylindrical roller bearings of the normal clearance range according to DIN 620-4:1982, and is applicable in the sense of being combined with the following clearance groups: C2, C3, C4 and C5, such as C2H

CV: Modified interior design, full cylinder roller bearings

CS: SKF bearing side with steel skeleton nitrile rubber (NBR) contact seal ring

CS2: SKF imported bearing side with steel skeleton fluorine rubber (FPM) contact seal ring

CS5: SKF imported bearing side with steel skeleton hydrogenated nitrile butadiene rubber (HNBR) contact seal ring

2CS: bearing with steel frame on both sides of the NBR contact seal ring

2CS2: bearing with fluorine rubber (FPM) contact seals with steel skeleton on both sides

2CS5: Bearing with HNBR contact seal ring with steel frame on both sides

  C1: radial clearance is less than C2

C2: Radial clearance less than normal group (CN)

C3: Radial clearance greater than normal group (CN)

C4: radial clearance greater than C3

C5: radial clearance greater than C4

C02: Reduced inner ring rotation accuracy tolerance

C04: Reduced outer ring rotation accuracy tolerance

C08: our fleet + C04

C083: our fleet + C04 + C3

C10: Reduced inner and outer diameter tolerances

D: Improved or slightly changed interior design with the same dimensions. It is usually of no significance to different types or series of bearings. Example: 3310D: split inner ring double row angular contact ball bearings

DA: The stop slot on the outer ring is improved, and the split inner ring is fixed by a fixing ring

DB: two back-to-back pairs of (1) single row deep groove ball bearings, (2) single row angular contact ball bearings or (3) single row tapered roller bearings. The letters following DB indicate the size of the axial clearance or axial preload of the paired bearing before installation. A Light preload (2) B medium preload (2) C heavy preload (2) CA small axial clearance (1, 2) CB ordinary axial clearance (1, 2) CC large axial clearance (1, 2) C special axial clearance, Plus a number in µm for (3) GA light preload (1) GB preload (1) G special preload, plus a number in daN for (3) for paired tapered roller bearings, there may be a two-digit number between DB and C or G to indicate the design and configuration of the ring. Such as 30224 J2 / DB31C250

DF: Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings paired face to face. The subsequent letters of DF have the same meaning as those of DB

DT: Two single row deep groove ball bearings, single row angular contact ball bearings or single row tapered roller bearings paired in series. Series matching installation; For paired tapered roller bearings, there may be a two-digit number after the DT to indicate the design and configuration of the spacer

E: Modified or slightly altered interior design with the same dimensions. It is usually of no significance to different types or series of bearings. Example: 7212BE: optimized internal design and single row angular contact ball bearings with contact angles of 40°

 EC: Single row cylindrical roller bearings, optimized interior design, with more and/or larger rollers, modified roller end face and flange contact

ECA: Spherical roller bearings, type CA, with reinforced roller sets

ECAC: Spherical roller bearings, CAC type, with reinforced roller sets

F: Machine cut steel or special cast iron cage, roll body guide, may have a number after F indicating a different design or material, such as F1

FA: Machine cut steel or special cast iron cage, outer ring guide

FB: Machine cut steel or special cast iron cage, inner ring guide

G: Single row angular contact ball bearings of general assembly, with a back to back or face to face matching bearing, with a certain axial clearance before installation

G.. : Used to describe the grease used in bearings, the second letter indicates the operating temperature range of the grease, the third letter indicates a certain actual grease. The second letter has the following meaning; E extreme pressure grease F Food Compatible grease H,J high temperature grease, -20 to +130°C L low temperature grease, -50 to +80°C M medium temperature grease, -30 to +110°C W,X low/high temperature grease, -40 to +140°C The digits following the three-letter grease code indicate the amount of grease filling that is different from the standard: 1, 2, and 3 for less than the standard, and 4 to 9 for more than the standard. For example; GEA extreme pressure grease, standard filling quantity. GLB2 low temperature grease, filled with 15% to 25% of the free space within the bearing.

GA: General assembly bearing, with light preload in back to back or face to face configuration

GB: Universal assembly bearings, pre-tightened in the back to back or face to face configuration

GC: General assembly bearing, with heavy preload in back to back or face to face configuration

GJN: Polyurea soap grease, NLGI consistency 2, operating temperature range -30 to +150°C

H: hardened card type stamped steel cage

HA: bearing or bearing part with hardened surface, the number following HA indicates the specific part 0 Complete set of bearing 1 inner ring and outer ring 2 outer ring 3 inner ring 4 inner ring, outer ring and rolling body 5 rolling body 6 outer ring and rolling body 7 Inner ring and rolling body

HB: bainite hardened bearing or bearing component. The number following HB indicates the specific part. The number represents the same part as that of HA

HC: bearing or bearing component of ceramic material, the number following HC indicates the specific part, and the number represents the same part as HA

HM: bearing or bearing part hardened by martensite. The number following HM indicates the specific part, and the number represents the same part as that of HA

HN: Bearings or bearing parts that have been specially surface treated. The numbers following HN indicate the specific parts, and the numbers represent the same parts as those of HA

HT: Used to describe the high temperature grease used in bearings (operating temperature -20 to +130°C). Other greases in this temperature range, different from the standard greASES specified, are indicated by a two-DIGIT number after HT. The amount of padding that differs from the standard is expressed as a letter or a combination of letters and numbers following HTxx: A less than the standard filling quantity B more than the standard filling quantity C more than 70% free space in SKF bearing F1 less than the standard filling quantity F7 more than the standard filling quantity F9 more than 70% free space in bearing such as: HTB, HT22 or HT24B

HV: quenchable stainless steel bearing or bearing component. The number following HV indicates the specific part. The number represents the same part as HA

J: stamped steel cage, roller-guided, unhardened, followed by a number indicating a different design, such as J1

JR: The cage is two flat steel plates connected by rivets, which are not hardened

K: Taper hole, taper 1:12

K30: Taper hole, taper 1:30

LHT: Used to describe the high and low temperature (wide temperature) grease used in bearings (operating temperature -40 to +140°C). A two-digit number after the LHT indicates some kind of actual grease. The padding, as opposed to the standard, is expressed as a letter after LT or a combination of letters and numbers. The code name used is the same as that of HT. For example, LHT23, LHT23C, or LHT23F7

LS: Contact seal with (or without) steel frame on one side of bearing

2LS: Contact seal with (or without) steel frame on both sides of bearing

LT: Used to describe the low temperature grease used in bearings (operating temperature -50 to +80°C). Other greases different from the standard greases specified but in this temperature range are indicated by a two-digit number after the LT. The padding, as opposed to the standard, is expressed as a letter after LT or a combination of letters and numbers. The code name used is the same as that of HT. For example, LT, LT10, or LTF1

L4B: Bearing ring and rolling body with special surface coating

L5B: Rolling body with special surface coating

L5DA: NoWear Never wear bearings, ceramic coated rolling body

L7DA: NoWear Never wear bearings with ceramic coated rolling body and inner ring raceway

M: Machine cut brass cage, roll body guide. Different designs and materials are represented by numbers after M, such as M2

MA: Machine cut brass cage with outer ring guide

MB: machined brass cage with inner ring guide

ML: One piece window brass cage with inner or outer ring guide

MP: One piece window brass cage with openings shaped by milling, reaming or drilling, guided by inner or outer ring

MR: One piece window brass cage, roll body guide

MT: Used to describe the medium temperature grease (operating temperature -30 to +110°C) used in bearings. Other greases different from the standard greases specified but in this temperature range are indicated by adding a two-digit number to the MT. The padding, as opposed to the standard, is expressed as a letter or a combination of letters and numbers after MT. The code name used is the same as that of HT. For example, MT33, MT37F9, or MT47

 N: the outer ring has a stop groove

NR: outer ring with stop groove or stop ring

N1: The outer ring is equipped with a positioning slot

N2: the outer ring is equipped with two 180° positioning slots

P: injection-molded fiberglass reinforced nylon 6,6 cage, roll body guide

PH: Injection molded polyether ether ketone (PEEK) cage, roll body guide

PHA: Injection molded Polyether Ether ketone (PEEK) cage, outer ring guide

P4: Dimensional accuracy and rotational accuracy meet ISO tolerance class 4

P5: Dimensional accuracy and rotational accuracy comply with ISO tolerance class 5

P6: Dimensional accuracy and rotational accuracy meet ISO tolerance class 6

P62: P6 + C2

About: P6 + C3

Q: For tapered roller bearings, optimized geometric contact and surface treatment

R: 1. Outer ring with flange 2. Curved roller surface (roller bearing)

RS: NBR contact seal with (or without) steel frame on bearing side

RS1: nitrile rubber (NBR) contact seal with steel frame on bearing side

RS1Z: Bearing with NBR contact seal with steel frame on one side, stamping steel dust cover on the other side

RS2: Fluorine rubber (FPM) contact seal with steel frame on bearing side

RSH: NBR contact seal with steel frame on bearing side

RSL: Nitrile rubber (NBR) low friction seal with steel frame on bearing side

RZ: NBR low friction seal with steel frame on bearing side

2RS: NBR contact seal with (or without) steel frame on both sides of bearing

2RS1: NBR contact seal with steel frame on both sides of bearing

2RS2: Fluorine rubber (FPM) contact seal with steel frame on both sides of bearing

2RSH: NBR contact seal with steel frame on both sides of bearing

2RSL: nitrile rubber (NBR) low friction seals with steel frames on both sides of bearings

2RZ: nitrile rubber (NBR) low friction seal with steel frame on both sides of bearing

S0: Special heat treatment, bearing ring below +150°C to maintain size stability

S1: With special heat treatment, bearing rings keep size stable below +200°C

S2: Special heat treatment, bearing ring below +250°C to maintain size stability

S3: Special heat treatment, bearing ring below +300°C to maintain size stability

S4: Special heat treatment, bearing ring size stability up to +350°C

 T: Machine cut fiber reinforced phenolic resin cage, roll body guide

TB: Window type fiber-reinforced phenolic resin cage with inner ring guide

TH: Cardstock fiber reinforced phenolic resin cage, rolling body guide

TN: injection molded nylon 6,6 cage, roll body guide

TNH: Injection molded polyether ether ketone (PEEK) cage, rolling body guide

TNHA: injection molded fiberglass reinforced nylon 6,6 cage, outer ring guide

TN9: injection-molded glass fiber reinforced nylon 6,6 cage, roll body guide

U: A number is added after U to indicate a reduced width tolerance band for tapered roller bearings, or their inner or outer rings, for example: U2: width tolerance +0,05/0mm U4: width tolerance +0,10/0mm

V: Full roller bearing (without cage)

V… : Adding a letter after V is used to indicate a characteristic that is different from the standard bearing. Adding a three or four digit number after V indicates its specific significance. For example: VA denotes a specific application VB external dimension difference VE external or internal difference VL coating VQ differs from standard quality and tolerance VS clearance and preloaded VT lubrication VU various other characteristics

VA201: Bearing for high temperature applications (e.g. kiln car)

VA208: Bearings for high temperature applications

VA228: High temperature application bearing

VA301: Bearings for railway traction motors

VA305: VA301+ special inspection procedure

VA3091: VA301 + VL0241

VA350: Bearings for railway bearings

VA405: Bearings for vibration machinery

VA406: Bearings for vibration machinery

VA820: Railway axle box bearings according to EN 12080:1998 standard

VC025: Bearing parts heat-treated with debris, used in heavily polluted working environments

VE240: CARB bearing allowing greater axial displacement

VE447: Three evenly spaced threaded holes on one side of the shaft ring to connect the lifting gear

VE522: One side of the outer ring with three evenly distributed threaded holes to connect the lifting gear

VE553: Three evenly spaced threaded holes on both sides of the outer ring to connect the lifting gear

VE632: One side of the seat ring is equipped with three evenly distributed threaded holes to connect the lifting gear

VG114: stamped steel cage with hardened surface

VH: Full roller bearing, designed to prevent roller from slipping out

VL0241: aluminum oxide coating on the outer surface of the outer ring, insulation capacity up to 1000V DC

VL2071: inner ring outer surface with alumina coating, insulation capacity up to 1000V DC

VQ015: Inner ring with convex arc raceway, can allow large alignment error

VQ424: Rotation accuracy is higher than C08

VT143: Filled with extreme pressure (EP) grease

W: There is no lubrication groove and hole in the outer ring

WT: To describe the wide temperature grease used in bearings (operating temperature -40 to +160°C). Other greases different from the standard greases specified but in this temperature range are indicated by adding a two-digit number after WT. The padding, as opposed to the standard, is expressed as a letter after WT or as a combination of letters and numbers. The code name used is the same as that of HT. For example, WT or WTF1

W20: There are three lubrication holes on the outer ring

W26: There are six lubrication holes on the inner ring

W33: Lubrication groove and three lubrication holes on the outer ring

W33X: outer ring with lubrication groove and six lubrication holes

W513: Lubrication groove and three lubrication holes on the outer ring and six lubrication holes on the inner ring

W64: Bearings filled with solid oil

W77: Outer ring with lubricating groove and three lubricating holes with stopper

X: 1. The external dimension is changed to according to ISO standard 2. Cylindrical roller surface (roller bearing)

Y: stamped brass cage, roll body guide, followed by a number indicating a different design, such as Y1

Z: Bearing side with stamped steel dust cover

2Z: bearing with stamped steel dust cover on both sides

Q6:What type of bearing does the SN220 bearing housing come with?

A:The bearing models are 22220, 23220,1220,2220.

Q7:How to know its diameter by bearing type?

A:Generally, the nominal inner diameter of bearings can be known from the bearing type, but the outer diameter and width dimensions should be checked for relevant information. The relationship between the nominal inner diameter and the code name of the bearing is:

1) The inner diameter is 0.6 ~ 10 (non-integer), and the code is directly expressed by the nominal inner diameter in millimeters, such as the deep groove ball bearing 618/2.5, that is, D =2.5;

2) The inner diameter 10 ~ 17 has special code, and the code of inner diameter 10, 12, 15 and 17 are 00, 01, 02 and 03 respectively. For example, 6201, d=12;

3) The inner diameter ranges from 20 to 480, which is the quotient of dividing the inner diameter by 5. If the quotient is less than two digits, add “0”, such as 08. For example, 23208, d=40;

4) If the inner diameter is greater than or equal to 500 or above and 22, 28, 32, it is directly expressed by the number of inner diameter in millimeters, and is separated by “/” between size series, similar to 1). If 230/500, d=500; 63/28, the d = 28

Q8:What is the weight of bearing 6204?

A:Bearing model: 6204 New model: 6204

Brand: NSK series: deep groove ball bearings

Inner diameter (D) : 20mm Outer diameter (D) : 47mm Thickness (B) : 14mm

Dynamic load: 12800Cr/kg Static load: 6600Cr/kg

Limit speed: 18000 Rated speed: 11,000

Weight (kg) : 0.107kg

Open, NSK deep groove ball bearings

Q9:What is the significance of bearing type RNNCF5018V?

A:Model: RNNCF5018V

Type: Double row full loaded cylindrical roller bearings

Brand: SKF

Meanings of the characters in the model number:

R: Separated bearing without inner or outer ring

NNCF: cage less double row cylindrical roller bearings with a single flange on the outer ring and a spring locking ring and oil hole groove

5018: basic model. Dimensions (mm) : Inner diameter 90, outer diameter 140, thickness 67

V: Full roller bearing (no cage)

Q10:What kind of bearing is 61902 ZZ?

A：Model: 61902 ZZ 

Type: Deep groove ball bearing

Suffix ZZ: dust-proof cover on both sides

Inner diameter: 15 mm

Outer diameter: 28 mm

Thickness: 7 mm