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Bearing size

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What is the diameter and number of balls of 760207tni, 760306tni, 760206tni, 760305tni
? I can’t find it by looking up the table

this question is too big
【 bearing type 】
● British single row deep groove ball bearing: R
● British single row deep groove ball bearing with flange: FR
● metric single row deep groove ball bearing: Mark omitted
● metric single row deep groove ball bearing with flange: F
● specific size metric single row deep groove ball bearing: Mr
● specific size metric single row deep groove ball bearing with flange: MF
● grooved thrust bearing: FM
● non grooved thrust shaft Bearing: F

[sealing ring. Dust cover]
● contact Teflon sealing ring with retaining ring on both sides: TT
● steel plate dust cover on both sides: ZZ
● contact rubber sealing ring on both sides: 2RS

● main grease brand mark


maltemp SRL (standard grease for micro and small bore bearings): SRL
Alvania No.2 (standard grease for small and medium bearings) : AV2
aero shell No.16 (for high temperature): AG6
Molykote 33m (for low load and low temperature): M4M
Krytox 240ac (for ultra high temperature): K24
isoflex super lds18: sl8
beacon 325: B32

● main lubricant brand marks

aero shell fluid 12 (standard grease) : af2
Windsor lube l-245x: wl2
antirust p2100:002

naming and basic code of SKF Bearing
naming of SKF Bearing:

a complete bearing code is composed of basic code and one or more supplementary codes. Basic code: used to indicate the type of bearing, the basic design of bearing and the overall dimension of bearing. Supplementary code: parts of bearing, variants with different structure or other characteristics from the basic design

basic code of SKF Bearing:
all standard bearings of SKF have specific basic models, usually consisting of three, four or five numbers, or letters and numbers. The first number or the first letter or combination of letters indicates the bearing type; The last two digits determine the ISO size series; The first digit represents the width or height series (dimension B, t or h respectively), and the second digit represents the diameter series (dimension D). The last two digits of the basic model are the size code of the bearing; Multiply by 5 to get the inside diameter in millimeters. However, there are some exceptions as follows:

1 In some cases, the number representing the bearing type and the first number representing the size series are omitted. Example: 6 (0) 208-2z (0) 3209 a

2 For bearings with an inner diameter less than or equal to 10mm or greater than or equal to 500mm, the inner diameter is usually directly expressed in mm without code. Dimensions are separated from the rest of the bearing model by slashes, e.g. 618 /8 (d = 8 mm) or 618 /530 MA (d = 530 mm)

3. Bearings with inner diameters of 10, 12, 15 and 17 mm have the following dimension code marks: 00 = 10 mm 01 = 12 mm 02 = 15 mm 03 = 17 mm

4 For some smaller bearings with an inner diameter less than 10mm, such as deep groove, self-aligning and angular contact ball bearings, the inner diameter is also expressed in mm (no code), but it is not separated from the series model by a slash, such as 629 or 129 (d = 9mm)

5. The bearing inner diameter deviating from the standard inner diameter is always expressed in millimeters up to three decimal places instead of codes. The inner diameter mark is part of the basic model and is separated from the basic model by a slash, such as 6202 /15875 (d = 15875 mm)

class 0: double row angular contact ball bearing (usually omitted) example: (0) 3204 a

class 1: self-aligning ball bearing example: 1201 etn9
class 2: spherical roller bearing Spherical roller thrust bearing example: 22209 e 29328 e
class 3: tapered roller bearing example: 32016 X /Q
class 4: double row deep groove ball bearing example: 4206 atn9
class 5: thrust ball bearing example: 51100
class 6: deep groove ball bearing example: 6213-2z
class 7: angular contact ball bearing example: 7305 becbm
class 8: cylindrical roller thrust bearing example: 81111 TN
class n: the second letter of cylindrical roller bearing, Sometimes the third letter is used to determine the flange structure, such as NJ, Nu, NUP; The model of double row or multi row cylindrical roller bearings always starts with NN
example: Nu 2317 ECJ
class C: carb bearing C 2205
class QJ: four point contact ball bearing example: QJ 217 ma
meaning of NSK bearing front code and rear code
[front code]
F – deep groove ball bearing with flange outer ring (applicable to inner diameter & lt; 10mm), for example: F 605
HR – high load tapered roller bearing, for example: HR 30207 J
MF – deep groove ball bearing with flange outer ring of specific size (applicable to inner diameter & lt; 10mm), for example MF 52
Mr – deep groove ball bearing with specific size (applicable to inner diameter & lt; 10mm), Example Mr 31

[post code]
1. Internal structure
CA — with brass solid cage
CD — with stamping cage
high load self-aligning roller bearing
e — high load cylindrical roller bearing
H — high load thrust self-aligning roller bearing

2. Material
G — ferrule, rolling element is carburized steel
H — ferrule, rolling element is stainless steel

3 Cage
m – copper alloy solid cage
T – synthetic resin cage
W – Stamping cage
V – no cage

4. Sealing ring, dust cover
Z, ZS – one side with steel plate dust cover
ZZ, zzs – two sides with steel plate dust cover
D, Du – one side with contact rubber seal
DD DDU – contact rubber sealing ring on both sides
V – non-contact rubber sealing ring on one side
VV – non-contact rubber sealing ring on one side

5. Ferrule shape
k – conical hole, taper 1:12
K30 – conical hole, taper 1:30
e – cut or oil hole on ferrule
E4 – oil groove and oil hole on outer ring
n – outer diameter of outer ring with stop groove
NR – outer diameter of outer ring with stop groove Stop ring

6. Fitting and gasket
DB – back-to-back paired installation
DF – face-to-face paired installation
DT – series paired installation
+ k – outer ring with gasket
+ L – inner ring with gasket
+ KL – Inner ring and outer ring with gasket
H – structural code of tightening sleeve
ah – structural code of disassembly sleeve
HJ – structural code of L-shaped retaining ring

7 Special specification
x26 – service temperature is limited to below 150 ℃
x28 – service temperature is limited to below 200 ℃
X29 – service temperature is limited to below 250 ℃
S11 – self aligning roller bearing, service temperature is limited to below 200 ℃

accuracy and grade of bearing
accuracy of rolling bearing is divided into (main) dimensional accuracy and rotation accuracy. The accuracy grade has been standardized and divided into five grades: P0, P6, P5, P4 and P2

the accuracy is improved from level 0. Level 0 is sufficient for general purposes, but level 5 or higher accuracy is required for the conditions or occasions shown in Table 1

although the accuracy levels above are based on ISO standards, their names are different in national standards

the accuracy grade applicable to various bearing types and the comparison between national standards

dimensional accuracy (items related to shaft and shell installation)

1. Allowable deviation of inner diameter, outer diameter, width and assembly width
2. Allowable deviation of inner and outer compound diameter of roller group
3. Allowable limit value of chamfer size
4. Allowable variation of width

rotational accuracy (items related to runout of rotating body)

1 Allowable radial and axial runout of inner ring and outer ring
2. Allowable lateral runout of inner ring
3. Allowable variation of outer diameter surface inclination
4. Allowable variation of thrust bearing raceway thickness
5. Allowable deviation and allowable variation of conical hole

deep groove ball bearing is the most commonly used rolling bearing. The utility model has the advantages of simple structure and convenient use. It is mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has certain performance of angular contact ball bearing and can bear combined radial and axial load. When the rotating speed is high and the thrust ball bearing is not suitable, it can also be used to bear pure axial load. Compared with other types of bearings with the same size, this kind of bearing has small friction coefficient and high limit speed. But it is not resistant to impact and is not suitable to bear heavy load

after the deep groove ball bearing is installed on the shaft, the axial displacement of the shaft or shell can be limited within the axial clearance of the bearing, so it can be positioned axially in both directions. In addition, this kind of bearing also has a certain centering ability. When it is inclined by 2 ′~ 10 ′ relative to the shell hole, it can still work normally, but it has a certain impact on the service life of the bearing.

deep groove ball bearing cages are mostly steel plate stamping wave cages, and large bearings mostly adopt turning metal solid cages.

deep groove ball bearings are widely used in automobiles, tractors, machine tools, motors, water pumps, agricultural machinery, textile machinery, etc

the raceway of the outer ring of the self-aligning ball bearing is spherical and has self-aligning performance, so it can automatically adjust the misalignment of the axis caused by the deflection or non concentricity of the shaft or shell.

product features:
mainly bear radial load and small axial load at the same time. The axial displacement of the shaft (shell) is limited within the clearance limit and has automatic centering performance. It allows the normal operation under the condition of small relative inclination of the inner and outer parts. It is suitable for parts where the coaxiality of the support seat hole cannot be strictly guaranteed.

main purpose
electromechanical equipment ◆ plastic machinery
office equipment ◆ transmission shaft of textile machinery
medical equipment ◆ fitness and sports equipment

self aligning ball bearing is a double row ball bearing with spherical outer ring raceway and two deep groove raceways on the inner ring, which has self-aligning performance. It is mainly used to bear radial load. While bearing radial load, it can also bear a small amount of axial load, but generally it can not bear pure axial load. Its limit speed is lower than that of deep groove ball bearing. This kind of bearing is mostly used on double bearing shafts that are prone to bending under load, and in parts where the double bearing seat hole cannot ensure strict coaxiality, but the relative inclination between the center line of the inner ring and the center line of the outer ring shall not exceed 3 degrees

cylindrical roller bearing is a separate bearing, which is very convenient for installation and disassembly. Cylindrical roller bearings are divided into single row, double row and four row.

cylindrical roller bearings can be divided into single row, double row and multi row cylindrical roller bearings according to the number of rows of rolling elements installed in the bearing. The single row cylindrical roller bearing with cage is widely used. In addition, there are cylindrical roller bearings with other structures such as single row or double row full loaded rollers.

single row cylindrical roller bearings are divided into n-type, nu type, NJ type, NF type and NUP type according to the different retaining edges of the ferrule. Cylindrical roller bearing bears large radial load capacity. According to the structure of ring retaining edge, it can also bear certain unidirectional or bidirectional axial load.

NN and NNU double row cylindrical roller

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