Insulated Bearings Designator

Introduction

Bearing code refers to a set of symbols used to indicate the inner diameter of the bearing, diameter series, width series and type. Code usually consists of letters and numbers, up to five digits, divided into the basic, rear, and front codes. The main difference between the insulated bearings designation and the common bearing designation is that the insulated bearings designation will add some suffixes, which are used to indicate the insulation characteristics of the bearing.

Components of rolling bearings

Rolling bearings are mainly composed of four parts: inner ring, outer ring, rolling element, and cage. The inner ring is usually closely matched with the shaft and rotates with the shaft. The outer ring is usually matched with the holes of the bearing housing or mechanical parts and plays a supporting role. The rolling element is the core component of the bearing, which rolls between the inner ring and outer ring to reduce friction. The cage is used to evenly separate the rolling elements to prevent them from colliding with each other and to ensure the normal movement of the rolling elements.

Insulated bearing design symbols

Rolling bearing four big pieces of code

NumberComponentNicknames
1outer ring1
2inner ring2
3rolling element4
4cage07/46

Front code

NicknamesMeaningExample
LSeparable inner or outer rings for separable bearingsLNU205
RBearings without separable inner and outer rings (needle roller bearings only for NA type)RNU205
KRoller and cage assembliesK81105
WSAxial cylindrical roller-bearing ringsWS81105
GSThrust cylindrical roller bearing housingsGS81105
FRadial ball bearings with flanged outer ring (only for d≤10mm)F619/5
KOWThrust bearings without shaft collarKOW-51105
KIWThrust bearings without seatKIW-51106
LRBearings with separable inner or outer rings and rolling element assemblies——

Rolling bearing designation

The basic code of the bearing is based on the bearing type code, size series code, and the inner diameter code of the three parts of the left to right order.

Insulated bearing types, sizes and bore designations

Type code

012345
Double Row Angular Contact BearingsSelf-aligning ball bearingsSpherical roller bearings and thrust spherical roller bearingsTapered roller bearingsDouble-row deep groove ball bearingsThrust ball bearings
678NUQJ
Deep groove ball bearingsAngular contact ball bearingsThrust cylindrical roller bearingsCylindrical roller bearingsSpherical Ball BearingsFour-point contact ball bearings

Size Series Designator

The size series code is calculated by the bearing width (height), degree series code (a number), and diameter series code (a number) for the composition of the left and right arrangement. It reflects the same kind of bearing in the ring aperture diameter of the same inner and outer ring width thickness of the different and different sizes of the rolling element. Obviously, the size series code of different bearings with different outer dimensions and bearing capacities is different. Size series code can sometimes be omitted: in addition to tapered roller bearings, the rest of the various types of bearings width series code “0”; are omitted; deep groove ball bearings and angular contact ball bearings 10 size series code in the “1” can be omitted; double-row deep groove ball bearings Width series code “2” can be omitted.

I.D. Code

Nominal bearing bore d [mm]I.D. CodeExample
0.6~10 non-integerDirectly expressed in nominal inside diameter in millimetres, separated from the size series designation by a "/."618/2.5 d=2.5mm
1~9 integersNominal inner diameter in millimetres directly expressed, for deep groove and angular contact ball bearings 7, 8, 9 diameter series, the inner diameter and size of the series code before the use of "/" Separation625、618/5 All d=5mm
10~17(10,12,15,17)00,01,02,036203 d=17mm
20~480 not including 22、28、32The quotient of the nominal inside diameter is divided by 5, and the quotient is a single digit. You need to add a zero in front of the quotient, such as 08NU307、 d=35mm
63/22、 d=22mm
≥500及22、28、32Expressed directly in nominal inside diameter in millimetres, but separated from the size series by a "/."Spherical roller bearings: 230/500 d=500mm

Rear Code

The posterior code indicates the structure of the bearing, cage, sealing and dustproof, tolerance, clearance and other technical requirements, which are located after the basic code.

Insulated bearing rear designator

Internal structure code

NumberMeaningExample
A、B、C、D、E1) Indicates internal structural changes
2) Indicates a standard design, the meaning of which varies with different types and structures.
B 1, Angular contact ball bearings Nominal contact angle a = 40° 7205B
2、Tapered roller bearings with increased contact angle 32305B
C 1, Angular contact ball bearings Nominal contact angle a = 15° 7005C
E 1, Reinforced NU 207 E
AC
D
ZW
Angular contact ball bearings Nominal contact angle a=25°
Split Bearing
Needle roller cage assembly Double-row
7210 AC
K 50×55×20 D
K 50×55×20 ZW

Seals, Dust Covers, and External Shape Change Designators

NumberMeaningNumberMeaning
RZSingle-sided with skeleton-type rubber seal (non-contact)2RZDouble-sided with skeleton-type rubber seal (non-contact)
RSSingle-Sided with Skeleton Rubber Seal (Contact)2RSDouble-sided with skeleton-type rubber seal (contact type)
ZSingle-sided dust cover2ZDouble-sided dust cover
NStop the groove on the outer ringNROuter ring with stop groove and stop ring
KBearings with tapered bore, taper 1:12K30Bearings with tapered bore, taper 1:30

Cage structure, material designation

NumberMeaningNumberMeaning
Cage materialsCage structure type and surface heat treatment
FSolid cage in steel, ductile iron or powder metallurgyHSelf-locking pocket hole cage
QBronze Solid CageWWelding Cage
MSolid brass cageRRiveted Cage
LLight alloy solid cageDCarbonitriding cage
TPhenolic Laminated Fabric Tube Solid CageCPlated cage
TNEngineering Plastic Molded CageAouter ring guide
JSteel Plate Punching CageBInner Circle Guidance
VFully loaded rolling element (no cage)SLubrication grooves on guide surfaces

Tolerance Class Designator

Code referenceSample comparison
new standardold standardnew standardold standard
P0G6203203
P2B6203/P2B203
P4C6203/P4C203
P5D6203/P5D203
P6E6203/P6E203
P6XEX30210/P6XEx7210

Gap code

The bearing clearance code is used to indicate the size of the clearance between the rolling element and the inner and outer rings inside the bearing. The size of the clearance has an important effect on the bearing’s fatigue life, vibration, noise temperature rise and other properties. The clearance code includes Cm, C0, C1, C2, C3, C4 and C5, which:

C0: standard clearance; this code is generally omitted in the bearing type without marking.

C1: Swimming gap by the standard provisions of 1 group, less than 2 groups.

C2: Swimming gap following the standard provisions of the 2 groups, less than 0 groups.

C3: Swimming gap per the standard specified in the group of 3, greater than 0 groups.

C4: Swimming gaps conform to the standard for groups of 4, greater than 3.

C5: Swimming gaps are under the standard for groups of 5, greater than 4.

In descending order: C1<C2<Cm<C0<C3<C4<C5

Other codes

Other designations for insulated bearings

Vibration code

Bearing vibration code is mainly divided into acceleration type and speed type two, respectively, with different units of measurement and code.

Acceleration type vibration designator:

Z1, Z2, Z3: These codes indicate different levels of vibration, of which Z1 level applies to the bearing vibration of general requirements of the finished bearing inspection, Z2 level applies to the Y series of motors and the corresponding requirements of other motor bearings, Z3 level applies to the vibration of the strict requirements of the situation.

Velocity-type vibration designator:

V, V1, V2, V3: These codes indicate different levels of vibration, of which level V is suitable for bearing manufacturers for the standard range of deep groove ball bearing vibration inspection, level V1 is ideal for bearing vibration has general requirements for bearing finished product inspection, level V2 is ideal for the Y series of motors and the corresponding requirements of other motor bearings, level V3 is suitable for vibration of the strict requirements of the situation.

Configuration code

DB: Pairwise back-to-back installation

DF: Pair face-to-face installation

DT: Installed in pairs in series

Example of Bearings Designation

Base codeRear Code
123456
ExampleType codeSize Series DesignatorI.D. CodeInternal compositionSealing structureCages and theirm materialsBearing MaterialsTolerance levelClearance
6204-2Z/P636242ZP6C3
NUP207ENUP27E
51840/P5251840P5C2

Insulated Bearings Suffix Code

Suffix codes for insulated bearings are used to identify the insulation characteristics and other additional characteristics of the bearing. These suffix codes may vary depending on the manufacturer and type of bearing but usually follow certain naming rules. The following are some common insulated bearings suffix codes and their meanings:

Suffix symbols for each brand of insulated bearings

SKF Insulated Bearings

VL0241: Standard outer ring coating, 3000V protection, minimum 200MΩ resistance. As: 6316/C3VL0241

VL2071: Standard inner ring coating, 3000V protection, minimum 200MΩ resistance. As:6326 M/C3VL2071

VL0246: Advanced outer ring coating, 3000V protection, minimum 400MΩ resistance.

VL2076: Advanced Inner Ring Coating, 3000V Protection, Minimum 400MΩ Resistance. As: 6332M.C3.VL2076

HC: Ceramic (Silicon Nitride) rollers for maximum insulation properties. As:6316/HC5C3S0.

FAG Insulated Bearings

J20AA: Coated outer ring, 3000V protection, suitable for dry and humid environments. As:6330-M-J20AA-C3

J20C: Inner ring coated, 3000V protection, suitable for dry and humid environments. As:6336-M-J20C-C4

J20AB: Coated outer ring, 1000V protection, especially suitable for humid environments. As:6228-J20AB

J20B: Simple protection, 500V protection, for dry environments. 6213-J20B-C4

J20A: Special protection for large-size bearings, 1000V protection for dry environments. As: NU1030M1-C4-J20A

HC: Ceramic (Silicon Nitride) rollers for maximum insulation performance. As: HC6002-2Z

NTN Insulated Bearings

7MC: standard ceramic coating, 5kV protection. As:7MC-6311M2C3

7MC2: Protective ceramic coating, 3kV protection. As:2TS2-7MC2-NH318E

7MC3: Standard ceramic coating, 3kV protection. As:7MC3-6314C3

7MP: Standard resin (PPS) coating, 5kV protection. As:2TS2-7MP-NU214

7MP2: Heat dissipation, anti-creep type resin (PPS) coating, and 5kV protection. As:7MP2-6312

CN03: Use of silicon nitride ceramic rollers.

NKE Insulated Bearings

SQ77: Coated outer ring, guaranteed at least 1000V AC or DC breakdown resistance. As:NU315-E-M6-C3-SQ77

SQ77E: Coated inner ring, guaranteed at least 1000V AC or DC breakdown resistance. As:6328-M-C3-SQ77E

-HYB: Ceramic (silicon nitride) rollers for maximum insulation performance. As:6330-C3-HYB

NSK Insulated Bearings

SN24: ceramic (silicon nitride) balls for small and medium-sized deep groove ball bearings. As:7018 A5-SN24-TR-DUDL-P3

HDY2: outer ring ceramic coating for medium and large deep groove ball bearings, insulation resistance of 10,000MΩ or more, insulation breaking voltage DC6000V or more. As:6220-HDY2-C3

Conclusion

The designation of insulated bearings adopts international bearing designations, such as outer ring insulated bearing designation VL0241, inner ring insulated bearing designation VL2071, etc. This standardization makes insulated bearings highly interchangeable in the market. It can be completely replaced with ordinary bearings, which are convenient for users to choose and use flexibly in different equipment and projects.

Frequently Asked Questions

  • What is an insulated bearing designator?

The design symbols for insulated bearings consist mainly of international bearing designations and specific suffixes. The design symbols for insulated bearings are usually international bearing designations followed by a specific suffix to identify their insulating characteristics.

  • How can I interpret bearing designators correctly?

To interpret bearing design symbols correctly, one must understand the basic structure and meaning of the code. Bearing code usually consists of the basic code before and after the code. The basic code indicates the bearing’s basic type, structure and size; the front code indicates the bearing’s structural shape, size, tolerance and technical requirements. The rear code indicates the internal structure, sealing, clearance precision and other auxiliary information.

  • What are the benefits of using designators for bearing selection?

The main benefits of using design symbols for bearing selection include increased design accuracy and efficiency, reduced errors, and ease of communication and exchange. In addition, using design symbols can help engineers better understand the principles and methods of bearing design.

  • Are TFL insulated bearings compatible with other brands?

Generally, our bearings are compatible with international standards. The compatibility of TFL insulated bearings needs to be specifically analyzed to see if their models and specifications are consistent with other brands of bearings and to consider the working environment and installation requirements. It is recommended that the replacement bearings be chosen carefully to ensure that they meet the use requirements.

  • How do I contact TFL for more information?

To learn more about TFL Insulated Bearings, you can find us by calling or sending an e-mail, visiting our official website or contacting Alibaba. Below:

Call Us: 0086 15806631151

Email Us: info@tflbearing.com / candice004@foxmail.com

URL: https://tflbearing.com/

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