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Bearing type
●Inch single row deep groove ball bearing: R
●Inch single row deep groove ball bearing with flange: FR
●Metric single row deep groove ball bearings: symbols omitted
●Metric single row deep groove ball bearings with flanges: F
●Metric single row deep groove ball bearings of specific sizes: MR
p>●Metric single row deep groove ball bearings with flanges in specific sizes: MF
●Thrust bearings with channels: FM
●Thrust bearings without channels: F
Sealing ring. Dust cover
●Contact Teflon sealing ring with retaining rings on both sides: TT
●Steel plate dust cover on both sides: ZZ
●Contact rubber seals on both sides: 2RS
Lubricant
●Main grease grade marks
Maltemp SRL( Standard grease for miniature and small-diameter bearings): SRL
Alvania No.2 (standard grease for small and medium-sized bearings): AV2
Aero shell No.16 (for high temperature): AG6
Molykote 33M (for low load, low temperature): M4M
Krytox 240AC (for ultra-high temperature): K24
Isoflex Super LDS18: SL8
Beacon325: B32
● Main lubricant grade marks
Aero shell Fluid 12 (standard grease): AF2
Windsor Lube L-245X ：WL2
Antirust P2100: 002
The naming and basic code of SKF bearings
The naming of SKF bearings:
A complete bearing A codename is composed of a basic codename plus one or more supplementary codenames. Basic code: used to indicate the type of bearing, the basic design of the bearing, and the overall dimensions of the bearing. Supplementary code: Bearing components, variants with different structures or other characteristics from the basic design.
The basic code of SKF bearings:
All SKF standard bearings have a specific basic model, usually with three, four or five numbers, or a combination of letters and numbers. The first number or first letter or letter combination indicates the bearing type; the next two digits determine the ISO size series; the first digit represents the width or height series (respectively, size B, T or H), and the second digit represents Diameter series (size D). The last two digits of the base model number are the bearing size designation; multiply by 5 to get the bore diameter in millimeters. However, there are some exceptions as follows:
1. In some cases, the number indicating the bearing type and the first number indicating 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 10 mm or greater than or equal to 500 mm, the inner diameter is usually expressed directly in millimeters without a code.
The size is separated from the rest of the bearing model with a slash, for example: 618/8 (d = 8 mm) or 618/530 MA (d = 530 mm).
3. Bore diameters are 10, 12, 15 and 17 mm bearings have the following size 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 10 mm, such as deep For groove, self-aligning and angular contact ball bearings, the inner diameter is also expressed in millimeters (without a code), but it is not separated from the series model by a slash, such as 629 or 129 (d = 9 mm).
5. Bearing inner diameters that deviate from the standard inner diameter are always not coded, but are expressed in millimeters with up to three decimal places. This bore designation is part of the base model number and is separated from the base model number by a slash, for example 6202/15,875 (d = 15,875 mm).
Category 0: Double row angular contact ball bearing (usually omitted) Example: (0) 3204 A
Category 1: Self-aligning ball bearing Example: 1201 ETN9
Category 2: Spherical roller bearing, spherical roller thrust bearing example: 22209 E 29328 E
Category 3: Tapered roller bearing example: 32016 X/Q
4 Category: Double row deep groove ball bearing example: 4206 ATN9
Category 5: Thrust ball bearing example: 51100
Category 6: Deep groove ball bearing example: 6213-2Z
Category 7: Angular contact ball bearing example: 7305 BECBM
Category 8: Cylindrical roller thrust bearing example: 81111 TN
Category N: Cylindrical roller bearing second A letter, sometimes the third letter, is used to determine the flange structure, such as: NJ, NU, NUP; The model number of double-row or multi-row cylindrical roller bearings always starts with NN.
Example: NU 2317 ECJ
Category C: CARB bearing C 2205
Category QJ: four-point contact ball bearing Example: QJ 217 MA.
The meaning of the front code and the rear code of NSK bearings
Front code
F - deep groove ball bearing with flange outer ring (applicable to Inner diameter lt; 10mm), example: f 605
HR - high load tapered roller bearing, example: HR 30207 J
MF - flange outer ring of specific size Deep groove ball bearings (applicable to inner diameter lt; 10mm), example mf 52
MR - deep groove ball bearings of specific sizes (applicable to inner diameter lt; 10mm), example MR 31
Post code
1. Internal structure
CA - with brass solid cage
CD - with stamped cage
High load spherical roller bearings
E——High load cylindrical roller bearings
H——High load thrust spherical roller bearings
2. Material
g - ferrule, rolling element is carburized steel
h - ferrule, rolling element is stainless steel
3. Keep Frame
M——Copper alloy solid cage
T——Synthetic resin cage
W——Punched cage
V——No cage
4. Seal ring, dust cover
Z, ZS——With steel plate dust cover on one side
ZZ, ZZS—— —With steel plate dust covers on both sides
D, DU — With contact rubber seals on one side
DD, DDU — With contact rubber seals on both sides
V——One side with non-contact rubber sealing ring
VV——One side with non-contact rubber sealing ring
5. Ring shape
K——Tapered hole, taper 1:12
K30——Tapered hole, taper 1:30
E——There are cuts or oil holes on the ferrule
E4——With oil groove and oil hole on the outer ring
N——With stopper groove on the outer diameter of the outer ring
NR——With stopper on the outer diameter of the outer ring Groove, stop ring
6, fit and gasket
DB - installed in back-to-back pairs
DF - installed in face-to-face pairs
DT——Series installation in pairs
K——Outer ring with pads
L——Inner ring with pads
KL—— Inner and outer rings with pads
H——Structure code of adapter sleeve
AH——Structure code of disassembly sleeve
HJ——L Type rib ring structure code
7. Special specifications
X26 - The operating temperature is limited to below 150℃
The following
Accuracy and grade
The accuracy of rolling bearings is divided into (mainly) dimensional accuracy and rotational accuracy. The accuracy levels have been standardized and divided into five levels: P0, P6, P5, P4, and P2.
The accuracy increases sequentially from level 0. Level 0 is sufficient for general purposes, but when used under the conditions or occasions shown in Table 1, accuracy level 5 or higher is required.
Although the above accuracy levels are based on ISO standards, their names are different in national standards.
Accuracy grades applicable to various bearing types and comparisons between national standards.
Dimensional accuracy (items related to shaft and housing installation)
1. Allowable deviations of inner diameter, outer diameter, width and assembly width
2. Roller Allowable deviations of the diameter of the inner complex circle and the diameter of the outer complex circle of the subgroup
3. Allowable limit value of chamfer size
4. Allowable variation of width
Rotation accuracy (items related to the runout of the rotating body)
1. Allowable radial runout and axial runout of the inner and outer rings
2. Allowable lateral runout of the inner ring
3. Allowable variation in the inclination of the outer diameter surface
4. Allowable variation in the thickness of the thrust bearing raceway
5. Allowable deviation of the tapered hole and allowable variation
Deep groove ball bearings are the most commonly used rolling bearings. Its structure is simple and easy to use. It is mainly used to bear radial loads, but when the bearing radial clearance is increased, it has certain performance of angular contact ball bearings and can bear combined radial and axial loads. When the rotation speed is high and it is not suitable to use thrust ball bearings, it can also be used to bear pure axial load. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient and a high limit speed. But it is not impact resistant and not suitable for bearing heavy loads.
After the deep groove ball bearing is installed on the shaft, it can limit the axial displacement of the shaft or housing in both directions within the axial clearance range of the bearing, so it can be axially positioned in both directions. In addition, this type of bearing also has a certain degree of alignment ability. When tilted 2′ to 10′ relative to the housing hole, it can still work normally, but it will have a certain impact on the bearing life.
Deep groove ball bearing cages are mostly stamped steel plate corrugated cages, and large bearings mostly use machined metal solid cages.
Deep groove ball bearings are widely used in automobiles, tractors, machine tools, motors, water pumps, agricultural machinery, textile machinery, etc.
The outer ring raceway of the self-aligning ball bearing is spherical and has self-aligning performance, so it can automatically adjust the axis misalignment caused by deflection or non-concentricity of the shaft or shell.
Product features:
Mainly bear radial load, and can bear small axial load at the same time. The axial displacement of the shaft (casing) is limited to the clearance limit, and it has self-aligning performance. It allows normal operation under the condition that the relative inclination of the inner and outer peripheries is not large. It is suitable for components where the support hole cannot strictly guarantee coaxiality.
Main uses
Electromechanical equipment ◆Plastic machinery
Office equipment ◆Textile machinery drive shafts
Medical equipment ◆Fitness and sports equipment
Aligning ball bearings are double-row ball bearings with an outer ring raceway processed into a spherical shape and an inner ring with two deep groove raceways. They have 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 cannot bear pure axial load, and its limit speed is lower than that of deep groove ball bearings. This type of bearing is mostly used on double support shafts that are prone to bending under load, and in components where the double bearing holes cannot ensure strict coaxiality, but the relative inclination of the center line of the inner ring and the center line of the outer ring must not exceed 3 Spend.
Cylindrical roller bearings are separate bearings and are very convenient to install and disassemble. Cylindrical roller bearings are divided into single row, double row and four row.
According to the number of rows of rolling elements installed in the bearing, cylindrical roller bearings can be divided into single-row, double-row and multi-row cylindrical roller bearings. Among them, single row cylindrical roller bearings with cages are the most widely used. In addition, there are cylindrical roller bearings with single row or double row full complement rollers and other structures.
Single row cylindrical roller bearings are divided into N type, NU type, NJ type, NF type and NUP type according to the different ring ribs. Cylindrical roller bearings have a large radial load capacity and can also withstand certain one-way or two-way axial loads depending on the structure of the ring ribs.
NN type and NNU type double row cylindrical roller bearings have compact structure, strong rigidity, large load-bearing capacity, and small deformation after being loaded. They are mostly used to support machine tool spindles.
FC, FCD and FCDP four-row cylindrical roller bearings can withstand large radial loads and are mostly used in heavy machinery such as rolling mills.
Cylindrical roller bearings are mainly used in motors, machine tools, petroleum, rolling mill loading and unloading machinery and various industrial machinery.
Single row cylindrical roller bearings are separable bearings, which are easy to install and disassemble. Both rings can use a tight fit. The modified contact line between the roller and the raceway can reduce stress concentration.
Double row cylindrical roller bearings are traveling bearings, and their separability makes installation and disassembly easy. Both ferrules can have a tight fit. Double row cylindrical roller bearings are almost not allowed to have an inclination angle.
Single-row cylindrical roller bearings are usually only subject to radial force. Compared with ball bearings of the same size, the radial load-bearing capacity is increased by 1.5-3 times. They have good rigidity and impact resistance. They are especially suitable for rigid supports. It also supports short shafts, shafts that are axially displaced due to thermal elongation, and machine accessories that require separable bearings for installation and disassembly. Mainly used in large motors, machine tool spindles, engine front and rear support shafts, train passenger car box shaft supports, diesel engine crankshafts, automobile tractor gearboxes, etc. NN30 series cylindrical roller bearings with tapered bores are mainly used as radial supports for machine tool spindles, NNU49 series double cylindrical roller bearings, and N19 and N10 single row cylindrical roller bearings.
Spherical roller bearings are equipped with drum-shaped rollers between an inner ring with two raceways and an outer ring with a spherical raceway. The center of curvature of the outer ring raceway surface is consistent with the center of the bearing, so it has the same alignment function as a self-aligning ball bearing. When the shaft or housing deflects, it can be automatically adjusted without increasing the burden on the bearings. Spherical roller bearings can bear radial loads and axial loads in two directions. It has large radial load capacity and is suitable for situations with heavy loads and impact loads. Bearings with a tapered bore in the inner ring can be installed directly. Or use an adapter sleeve or disassembly barrel to install it on the cylindrical shaft. The cage uses steel plate stamping cage, polyamide forming cage and copper alloy machined cage. ?
Spherical roller bearings can bear large radial loads and can also bear certain axial loads. The outer ring raceway of this type of bearing is spherical, so it has self-aligning performance. When the shaft is bent or tilted due to force and the relative tilt between the center line of the inner ring and the center line of the outer ring does not exceed 1° to 2.5°, the bearing can still work. .
The inner bore of spherical roller bearings has two types: cylindrical and conical. The taper of the conical inner hole is 1:1 2 or 1:30. In order to enhance the lubrication performance of the bearing, an annular oil groove and three evenly distributed oil holes are processed on the outer ring of the bearing.
Spherical roller bearings are suitable for bearing heavy loads and impact loads, and are widely used in metallurgy, rolling mills, mining, petroleum, papermaking, cement, sugar pressing and other industries.
Needle roller bearings are roller bearings with cylindrical rollers that are thin and long relative to their diameter. This type of roller is called a needle roller. Despite their smaller cross-sections, the bearings have a high load-bearing capacity and are therefore particularly suitable for applications where radial space is restricted.
The needle roller profile surface shrinks slightly at the proximal end surface. The result of corrected linear contact between needle rollers and raceways is the avoidance of damaging edge stresses. In addition to those listed in the catalog, bearings that can be used for general engineering, such as: open drawn outer ring needle roller bearings (1), closed drawn outer ring needle roller bearings (2), needle roller bearings with inner rings (3) and bearings without In addition to inner ring needle roller bearings (4), SKF can also supply various types of needle roller bearings, including: 1. Needle roller cage assembly 2. Ribless needle roller bearings 3. Self-aligning needle roller bearings 4. Combination Needle roller/ball bearing 5, combined needle roller/thrust ball bearing 6, combined needle roller/cylindrical roller thrust bearing.
Stamped outer ring needle roller bearings are needle roller bearings with a thin stamped outer ring. Its main feature is that the cross-section height is very low and the load-bearing capacity is high. It is mainly used for bearing configurations that are compact in structure, cheap in price, and the inner hole of the bearing box cannot be used as the raceway of the needle roller cage assembly. Bearings and bearing housings must be installed with an interference fit. If the axial positioning functions such as box shoulders and stop rings can be omitted, the inner hole of the bearing box can be made extremely simple and economical.
The stamped outer ring needle roller bearings installed on the shaft end include double-sided open type (1) and single-sided closed type (2). The base end face of the closed stamped outer ring can withstand a small axial guidance force.
Stamped outer ring needle roller bearings generally do not come with an inner ring. In situations where the journal cannot be hardened and ground, the inner rings listed in the table can be used. The hardened steel outer ring of drawn cup needle roller bearings is inseparable from the needle roller and cage assembly. Free space for lubricant storage allows extended relubrication intervals. Bearings generally adopt a single row design. Except for the wider bearing series 1522, 1622, 2030, 2538 and 3038, which are equipped with two needle roller cage assemblies. The outer ring of the bearing has lubricating oil holes. According to user needs, all single-row stamped outer ring needle roller bearings with shaft diameter greater than or equal to 7mm can be equipped with outer rings with lubricating oil holes (code suffix AS1).
Oil-sealed drawn cup needle roller bearings
In situations where an oil seal cannot be installed due to space constraints, oil-sealed drawn cup needle roller bearings with open or closed ends (3 to 5). This type of bearing is equipped with a friction-type oil seal of polyurethane or synthetic rubber, which is filled with lithium-based grease with good anti-rust properties, and is suitable for operating temperatures from -20 to 100°C.
The inner ring of the bearing with oil seal is 1mm wider than the outer ring. This ensures that the oil seal works well and avoids contamination of the bearing when the shaft has a slight displacement relative to the bearing box. The inner ring of the bearing also has a lubrication hole, which can be re-lubricated by the outer ring or the inner ring according to the needs of the bearing configuration.
Insert spherical bearings are preferred for applications that require simple equipment and components, such as agricultural machinery, transportation systems or construction machinery. A spherical bearing unit consists of a double-sided sealed spherical outer ring deep groove ball bearing and a gray cast iron or stamped steel plate bearing seat.
Outer spherical bearings are mainly used to bear the combined radial and axial loads, which are mainly radial loads. Generally, they are not suitable to bear axial loads alone. This kind of bearings can be installed with inner rings separately (with a full set of rollers). sub and retainer) and outer ring. This kind of bearing does not allow the shaft to tilt relative to the housing, and will generate additional axial force under any radial load. The size of the axial clearance of this kind of bearing has a great relationship with whether the bearing can work normally. When the axial clearance is too small, the temperature rise will be high; when the axial clearance is large, the bearing will be easily damaged. Therefore, special attention should be paid to adjusting the axial clearance of the bearing during installation and operation. If necessary, pre-interference installation can be performed to increase the rigidity of the bearing.
Linear bearings are low-cost produced linear motion systems for use with cylindrical shafts over unlimited travel. Since the bearing ball is in point contact with the shaft, the operating load is small. The steel ball rotates with minimal frictional resistance, enabling smooth movement with high precision.
Linear bearings are widely used in precision equipment such as electronic equipment, tensile testing machines and digital three-dimensional coordinate measuring equipment, as well as multi-axis machine tools, punch machines, tool grinders, automatic gas cutting machines, printers, card sorters, food Sliding parts of industrial machinery such as packaging machines.
*Lubrication and friction
*Grease lubrication
Anti-corrosion oil is injected into the linear bearing. If grease is used for lubrication, it should be removed with kerosene or organic solvent first. Anti-corrosion oil, add grease after drying.
It is recommended to use lithium soap grease with a viscosity mark of N0.2.
*Oil lubrication
If oil is used for lubrication, it is not necessary to remove the anti-corrosion oil. According to the temperature change, lubricating oil with ISO viscosity grade VG15-100 can be selected. Shaft lubrication can be supplied from the oil supply pipe or from the oil hole on the outer bearing seat. Oil lubrication is not suitable for non-porous sealed bearings because the seals will scrape off the oil.
*Friction coefficient
The energy loss caused by friction is very small. When the movement speed is less than 60m/min, the temperature effect is negligible.
The friction force can be obtained from the following equation: F=ц.?P fs F: Friction force (N)
*: Sealing resistance (2~5N) P: External load (N)
ц: Friction coefficient
*Installation
*Fitting clearance
The recommended fitting tolerance for use with the inner bore of the bearing seat and the diameter of the optical axis. Normally, bearings cannot be preloaded, but high-precision, light preloads can be added to the bearings. However, the negative diameter tolerance should not exceed the data in the table. The matching clearance between the bearing box and the shaft and the bearing.
Precautions during installation:
When installing the linear bearing into the bearing seat, auxiliary work should be used to avoid directly knocking the end face or sealing ring. The bearing should be introduced evenly and buffered Plate, insert the optical shaft into the linear bearing by gently tapping it. The centerline of the shaft and the bearing must be aligned. If the shaft is inserted at an angle, the balls may fall off or cause the cage to deform, causing damage to the linear bearing. The external load should be evenly distributed across the entire bearing, especially when subjected to instantaneous loads, two or more bearings should be used. Linear bearings do not bear rotational loads, which can cause accidents.
Thrust cylindrical roller bearings are separate bearings that can only withstand one-way axial load and slight impact. They can limit the axial displacement of the shaft (or housing) in one direction, so they can be used as one-way shafts. direction positioning. But its load-bearing capacity is much greater than that of thrust ball bearings. When the roller rolls, due to the different linear speeds at both ends of the roller, the roller inevitably slides on the ring raceway. Therefore, the limit speed of this type of bearing is lower than that of thrust ball bearings, and it is usually only suitable for low-speed operation occasions.
The standard design of thrust cylindrical roller bearings uses machined metal solid cages. According to user requirements, cages of other types or materials can also be used.
Thrust tapered roller bearings can only bear one-way axial load and can limit the one-way axial displacement of the bearing, so they can be used for one-way axial positioning. Compared with thrust cylindrical roller bearings, they have large load-bearing capacity and small relative sliding, but have lower limit speed.
Thrust cylindrical roller bearings are mainly used in heavy machine tools, high-power marine gearboxes, oil drilling rigs, vertical motors and other machinery.
Thrust ball bearings are composed of a row of steel balls (with a cage), a shaft ring (a tight fit with the shaft) and a seat ring (with a gap between the shaft and a tight fit with the bearing seat hole). The steel balls Rotate between shaft ring and seat ring. It can only bear axial load in one direction and cannot bear radial load. Since the axial load is evenly distributed on each steel ball, the load capacity is large; but during operation, the temperature rise is large and the allowable limit speed is low.
Thrust ball bearings cannot limit the radial movement of the shaft or housing, but can limit the axial movement of the shaft and housing in one direction. Therefore, such bearings are usually used in conjunction with deep groove ball bearings.
During installation, the axis of the shaft and the housing hole must be kept concentric, otherwise the bearing will be damaged prematurely due to stress concentration. In order to eliminate this undesirable phenomenon, a radial gap of 0.5 to 1mm can be left between the outer diameter of the seat ring and the housing hole. The centerline of the shaft and the supporting surface of the housing should be vertical, and the shaft should not be tilted or deflected. Otherwise, the bearing will be damaged prematurely due to uneven load distribution. In order to eliminate the tilt of the bearing axis, the supporting surface of the seat ring can be padded with elastic materials, such as oil-resistant rubber, leather, etc., or a thrust ball bearing with a spherical seat can be used.
Thrust ball bearings are separate bearings and are divided into one-way thrust ball and two-way thrust ball bearings according to their structural form. One-way thrust ball bearings can bear axial loads in one direction, and two-way thrust ball bearings can bear axial loads in two directions. None of them can withstand radial loads. Thrust ball bearings also have a structure with a seat cushion. Since the mounting surface of the seat cushion is spherical, the bearing has self-aligning performance and can reduce the impact of installation errors. Thrust ball bearings are mainly used in automobiles, machine tools and other industries.
Angular contact ball bearings can bear both radial and axial loads. Can work at higher speeds. The larger the contact angle, the higher the axial load capacity. High-precision and high-speed bearings usually have a contact angle of 15 degrees. Under the action of axial force, the contact angle will increase.
Single row angular contact ball bearings can only bear axial load in one direction. When bearing radial load, additional axial force will be caused. And it can only limit the axial displacement of the shaft or housing in one direction. If they are installed in pairs, make the outer rings of the pair of bearings face each other, that is, the wide end faces the wide end face, and the narrow end faces the narrow end face. This avoids causing additional axial forces and limits the axial play of the shaft or housing in both directions.
Because the raceways of the inner and outer rings of angular contact ball bearings can have relative displacement on the horizontal axis, they can bear both radial loads and axial loads - combined loads (single row angular contact ball bearings can only Bear unidirectional axial load, so they are generally installed in pairs). The materials of the cage include brass, synthetic resin, etc., which vary according to the bearing type and usage conditions.
Angular contact ball bearings include: 7000C type (∝=15°), 7000AC type (∝=25°) and 7000B (∝=40°) types. The lock of this kind of bearing is on the outer ring. Generally, the inner and outer rings cannot be separated. It can withstand combined radial and axial loads as well as axial loads in one direction. The ability to withstand axial load is determined by the contact angle. The larger the contact angle, the higher the ability to withstand axial load. This kind of bearing can limit the axial displacement of the shaft or housing in one direction.
Tapered roller bearings mainly bear radial and axial combined loads. The load-bearing capacity of the bearing depends on the raceway angle of the outer ring. The larger the angle, the greater the load-bearing capacity. This type of bearing is a separable bearing and is divided into single-row, double-row and four-row tapered roller bearings according to the number of rows of rolling elements in the bearing. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation; the clearance of double-row and four-row tapered roller bearings has been set according to user requirements when the product leaves the factory and does not require user adjustment.
Tapered roller bearings have conical inner and outer ring raceways, with tapered rollers arranged between them. The projection lines of all conical surfaces converge at the same point on the bearing axis. This design makes tapered roller bearings particularly suitable for carrying combined (radial and axial) loads. The axial load capacity of the bearing is mostly determined by the contact angle α; the larger the α angle, the higher the axial load capacity. The size of the angle is expressed by the calculation coefficient e; the larger the value of e, the larger the contact angle, and the greater the suitability of the bearing for bearing axial loads.
Tapered roller bearings are usually separate types, that is, the tapered inner ring assembly consisting of an inner ring with a roller and cage assembly can be installed separately from the tapered outer ring (outer ring).
Tapered roller bearings mainly bear combined radial and axial loads, mainly in the radial direction. The load-bearing capacity of the bearing depends on the raceway angle of the outer ring. The larger the angle, the greater the load-bearing capacity. This type of bearing is a separable bearing and is divided into single-row, double-row and four-row tapered roller bearings according to the number of rows of rolling elements in the bearing. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation; the clearance of double-row and four-row tapered roller bearings has been set according to user requirements when the product leaves the factory and does not require user adjustment.
Tapered roller bearings are widely used in automobiles, rolling mills, mining, metallurgy, plastic machinery and other industries.