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China Best Sales 128809K  85*45*220mm Mud Motor Radial Bearings bearing driver

Product Description

Model 128809K
Design Structure Angular contact
d 45mm
D 85mm
H 220mm
Ring Material 55SiMoVa or 8620 steel 
Cage Material Without cage
Load rating  Ca Welcome to inquiry
Load rating  Coa Welcome to inquiry
Sealed as customer requested
Weight Accordingly
Bearing Arrangement In Tandem
Precision P6,P5 P0 or as customer requested
Vibration ZV1, ZV2, ZV3, or  as customer requested
Clearance C0, C2, C3, or  as customer requested
Quality standard ISO9001: 2000/SGS
Package single box
Original HangZhou
Service OEM
Delivery date Accordingly
Application Oil drilling motor
Downhole motor
Electric submersible pump
Product features Special steel for all bearing components
Full complement bearing
Precision matched rings
Unique bearing design to support heavy axial drilling loads
Customer benefits Improved wear-resistance
Increased load carrying capacity
Optimized load distribution
Increased robustness
Improved reliability
Customized design

Mud Motor Bearing

Our main bearings products including bearings of petroleum screw drilling tools, equal-wall-thickness rubber stator of petroleum screw drilling tools, roller bearings(bearing roll),55SiMoVa or 8620 steel ball of three-roller rock bit, roller, thrust block and pad as well as hobbing cutter shaft of coal mine development, and main and supporting components and parts of construction machinery. The bearings for petroleum screw drilling tools(multi-row thrust ball bearings)are our leading products developed and filled the gap of China in 1980s.Up to now, there are more than 20 series including over 200 models.

Whether you’re drilling for oil or gas, the bearings in a mud motor at the end of a drill string have a direct impact on productivity and reliability. These mud motor bearings have to endure extreme operating conditions. In addition to severe axial and shock loads, these bearings are “lubricated” with highly CZPT mud, which for a bearing is the definition of an extreme operating condition.

Down hole motor or drilling motor for the oil drilling industry

Bearing Assembly of Downhole Motor is used to transmit motor rotary dynamic force to the bit, meanwhile to withstand axial and radial load from drilling weight. Inside of the Bearing Assembly,Monton uses TC Radial Bearing and a stacked thrust bearings. The thrust bearings support the downward force resulting from the “weight on bit” (WOB) and the loads from the combination of hydraulic thrust and weight loads from internal components.Monton provides different bearing assemblies, designed to meet the diverse requirements of the drilling industry.

Mud Motor Radial Bearing

 A mud motor bearing assembly, comprising: a stationary housing having an inner wall surface defining an interior bore; a rotatable drive shaft extending through the interior bore of the stationary housing, the rotatable drive shaft having a tubular drive shaft with a uniform outer diameter terminating at an outlet section with an enlarged outer diameter, the rotatable drive shaft including an inner bore for passage of a drilling fluid; a bearing section bearing a radial load and an axial load, the bearing section including at least a pair of stationary bearing rings and at least a pair of rotating bearing rings in stacked arrangement, each of the stationary bearing rings having an inner periphery and an outer periphery, the outer periphery of each of the stationary bearing rings operatively engaged to the inner wall of the stationary housing, the inner periphery of each of the stationary bearing rings including a projection, each of the rotating bearing rings having an inner periphery and an outer periphery, the inner periphery of each of the rotating bearing rings operatively engaged to the tubular drive shaft, the outer periphery of each of the rotating bearing rings including a projection, the projections of the pair of stationary bearing rings forming a recess that accommodates the projection of 1 of the pair of rotating bearing rings in sliding engagement; wherein the stacked arrangement alternates between at least partially overlapping stationary bearing rings and rotating bearing rings. 


Mud motor bearings

Mud motor bearings, or ball bearings have conventionally been used to react thrust, or axial, loads in down hole mud motors. When low rpm power sections are used in the application such bearings provide sufficient life and reliability. However, bearing component fatigue causes life to decrease linearly as speed increases. This fatigue makes ball bearings unsuitable for high rpm motors. Standard engineering practice dictates that ball bearings are specified according to L10 life, or the number of revolutions a group of identical bearings is expected to sustain before 10% fail. As revolutions are related to speed, bearings operating in a higher speed motor will fail before those operating in a low speed motor, e.g. 1 could roughly expect a 90% reduction in bearing life if speed was increased from 100 to 1000 rpm. In addition to life, friction and horsepower losses are often of interest in drilling. Ball bearings are referred to as frictionless bearings due to the rolling nature of the elements, however in practice frictional losses exist due to rolling resistance and sliding. An order of magnitude approximation of the coefficient of friction (cof) for an angular contact bearing operating in ideal non-abrasive lubricant conditions is 0.0032.1 In drilling mud, the cof can be assumed to be significantly higher.

Bearing Assembly

The function of the bearing assembly in a positive displacement drilling motor is to support axial load (typically weight on bit) and centralize and support side loading on the motor’s driveshaft. The bearing assemblies used in drill motors have been developed for use in different applications with certain motor configurations offering a choice of axial bearing type options. All MONTON bearings are fluid-lubricated and optimized for specific drilling applications.

Ball Bearing The Ultra Ball Bearing assembly has been improved over the years and suits for the majority of drilling applications. These bearings are used on various power sections where moderate weight on bit and drilling torque are required. With the introduction of high power Ultra drilling motors with an increased torque output, the ball bearings have been continuously improved to handle it.

The ball bearing assembly is the bearing of choice for many applications as modern PDC bit designs demand higher torque, available from today’s drill power sections. This bearing assembly is suited to more demanding applications using low or medium speed motors, where the objective is to increase drilling performance by driving more torque to the bit.

The 6 ¾ in. extreme ball bearing assemblies have been developed to maximize performance and reliability in challenging drilling environments and are reserved for exclusive use with the extreme motors. Also featuring an increased internal diameter, this bearing type allows for a step-change in torque capacity of the motor driveshaft-necessary assuring reliable delivery of the massive torque generated by the extreme power section.

Bearing Sub-assembly

The bearing sub assembly transmits the torque and speed of the rotor, as well as the compressive load from the bottom hole assembly (BHA). The primary components of the bearing assembly are the driveshaft, bearing housing, radial bearings, and axial bearings.

The axial bearings are a stacked ball-and-race design that provides durable performance down hole while maintaining ease of repair. The bearing assembly is also a mud-lubricated design in which the drilling fluid provides lubrication to both the radial and axial bearings while drilling. An advantage of mud lubrication is that there are minimal limitations on bit pressure drop compared to sealed bearing assembly. The bit pressure drop can be maximized for optimum penetration rate without adversely affecting the life of the bearing subassembly. Also, because mud-lubricated bearing subs assemblies do not contain any elastomeric seals, they can be run in the highest down-hole temperatures and in highly aromatic drilling fluids without fear of degradation. The bearing housings are available with a threaded outside diameter for screw-on stabilizers for tool sizes with an outside diameter greater than 5″. This option allows the stabilizers to be changed in the field.

Monton offers 2 bearing assembly options: M1 and M2.

M1 Bearing Subassembly

The first generation, mud-lubricated bearing subassembly is a field-proven design that has been deployed in most drilling applications. The M1 is ideally suited to be run with Flex Drill power sections.

M2 Bearing Assembly

The G2 (second-generation) performance bearing subassembly that is designed for today’s harsher drilling environments. With improved radial and axial bearing design, the M2 sub assembly can handle the higher torque associated with of either HR or Siro Star power sections. Its improved radial bearings provide increased durability in high dogleg applications. A short bit-to-bend M2 bearing subassembly is available in limited sizes.

Bearing Section

The bearing section makes up the lower half of the motor. It is comprised of a drive shaft that is supported by a series of radial and thrust bearings. The bearing section is what controls the mechanical energy supplied by the power section to the drive shaft. The drive shaft transfers this energy to the drill bit through the bit box. Drilling parameters, such as weight on bit (WOB), circulation rate, and bit differential pressure directly affect the bearing section.

The Monton bearing section is an open bearing design (i.e. the bearings are lubricated by the drilling fluid). Monton uses a stacked multiple ball-and-race design for the thrust bearings (see Figure 5). An open bearing system offers the advantage of allowing higher differential pressures across the drill bit over a traditional sealed bearing arrangement.

The thrust bearings support the downward force resulting from the weight on the drill bit (WOB)

and the loads from the combined hydrostatic thrust and weight from the internal motor components. Radial bearings support the side loads on the drive shaft and help regulate the flow of drilling fluid through the bearing assembly. Some of the drilling fluid is diverted to cool and lubricate the bearings. Monton uses radial bearings with tungsten carbide tile inserts which are imbedded in a tungsten carbide matrix for maximum wear resistance from side loads.

About the redesign process 

Specially designed to provide excellent radial load support for both sealed and mud motors, Monton tungsten carbide radial bearings are made using a unique microwave sintering process (resulting in 1 600 CZPT hardness) as compared to typical conventional sintering (with 1 000 CZPT hardness). This results in a high hardness of 92 HRa for excellent wear resistance and longer life.

To significantly improve bearing performance and reliability,Monton engineers used proprietary Monton design and simulation tools to:

• accurately define the behavior of a bearing stack

• redesign the bearing to minimize stresses and optimise load carrying capacity

• test new designs and materials. With the Monton virtual test rig, engineers were CZPT to identify and correct the problem of cracked rings and sheared balls – 2 common problems with these bearing

Downhole sealing solutions

Monton has innovative seal designs and quality materials for downhole rotating seals exposed to high pressure. The Monton Teflathene seal incorporates a low-friction PTFE seal ring bonded to a rubber body. The all-rubber DM2 seal separates drifting mud from lubricants in oil-lubricated mud motor bearings. Bottom hole assembly (BHA) tools such as shocks and jars require seals to protect the tool hydraulics from the CZPT drill muds and cuttings in the hole. Measure-while-drilling (MWD) tools sometimes require high-temperature sealing solutions.Monton has developed a full line of field-proven seals to work in this demanding environment, including a seal capable of withstanding up to 315 °C (600 °F).

How the new bearing works

The typical mud motor bearing contains between 8 and 12 rows for design optimization. When the bearing is new, the majority of the load is accommodated by the first 4 or 5 rows . As each row starts to wear, the load is shifted to the next row and the next  until all the rows are worn equally. Then, the load is shifted back to the first row and the process is repeated.

This unique design enables the bearing to last significantly longer than previous bearing designs.

Product features

• Special steel for all bearing components

• Full complement bearing

• Precision matched rings

• Unique bearing design to support heavy axial drilling loads

Customer benefits

• Improved wear-resistance

• Increased load carrying capacity

• Optimized load distribution

• Increased robustness

• Improved reliability

• Customized design


Oil drilling motor

Down-hole motor

Electric submersible pump

Bearing working life:


Main Customers:

Oil company like: SLB, Halliburton and GE

Main application:

Downhole motor or drilling motor

Size list we already produced:

Model of Drilling Tools Bearings d D H
LZ60 128705K 25 50 75
LZ73 128807K 36 60 91
LZ89 128708K 42 74 162
LZ95 128709K 45 77 180
LZ102 128809K 45 85 220
LZ105 128709K(LL) 46 86 220
LZ120 128711K 54 98 240
LZ120 128711K(LL) 55 100 190
LZ127 128713EB 65 110 220
LZ165 128717G(LL) 84 144 308
LZ165 128816KBX 80 145 347
LZ165 128717KA 84 145 357.5
LZ172 128817K 85 150 375
LZ172 128718KC 90 152 433
LZ172 128718EA 92 154 330
LZ185 128718EK 90 162 380
LZ197 128718KA 90 160 440
LZ197 128718K 90 170 380
LZ197 128820K 100 173 460
LZ197 128819D 95 175 466
LZ203 128720KAI 100 174 656
LZ203 128720A 100 176 400
LZ203 128820D 100 180 466
LZ216 128721K 105 188 418
LZ216 128722EB 110 192 440
LZ244 128724K 100 215 465
LZ244 128725EA 125 215 440
LZ244 128726E 130 215 418
LZ286 128729K 145 260 550
LZ197 128713K 65 128 351.5
LZ197 128916M 80 148 363
LZ203 128718 90 142 550
LZ203 128718M 90 142 550
LZ203 128718KM 90 142 451
LZ216 128721K 105 165 505.5
LZ216 128721M 105 165 505.5
LZ244 128723 115 205 570
LZ244 128723M 115 205 570
LZ244 128726 130 205 788
LZ286 128726M 130 205 788
LZ244 128705K 27.81 45.40 88.90
LZ286 128916K 84.5 149.5 294.5
DRG1-172.240SB 90 152 500 40
DR3-120.240SB 55 100 275 8.8
DR4-95С.240 50 88 280 6.5
DR4-95С.240-01 50 88 243 5.3
DR-240.240SB 130 205 495 68.7
SM700.240SB  94 156 500 41
DGR-178.240-01SB 92 148 390.5  
D2-127.090 SB 60 105 325 12.5
D-76.240 SB 34 63 200 3
DR4-95S.240 SB 50 88 280 6.5
ДР 240.240 ДГР1 130 205 495 68.7
57196167 62.5 104.5 228.6  
57196157 84.33 149.78 294.64  
57193823 119.38 215.01 370.84  
CZC90X152A 90 152 349  
700-40-A0-RU-01 90.3 148.72 444.5 32
260-5006 130 215 494  
260-5006-001 130 215 418  
MT90-154 90 154 363  
MT64-108 64 108 240  
MT90-148 90 148 464  
128726SHI 130 205 720 98
2358188 103.4288 178.6128 321.6402  
202-313-04-9 42.1894 67.7672 158.1404  
95C.240 50 88 242.5 6.1
AP3.120.240 55 100 275 8.8
128705 27.81 45.4 88.9  
6.625in 121.031 214.884 370.84  
128718KM 90 170 380  
129918KM 133.35 215.9 419.1  

Welcome to cooperate with us. For sizes not listed, we can accept customization.
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Rolling Body: Roller Bearings
The Number of Rows: Multi-column
Outer Dimension: Small and Medium-Sized (60-115mm)
Material: Bearing Steel
Spherical: Non-Aligning Bearings
Load Direction: Thrust Bearing


Customized Request

radial bearing

Can you describe the load-carrying capacity and load ratings of radial bearings?

The load-carrying capacity and load ratings of radial bearings are crucial factors to consider when selecting and designing bearing systems for industrial applications. Here is a detailed description of these aspects:

Load-Carrying Capacity:

The load-carrying capacity of a radial bearing refers to its ability to support and distribute loads without excessive deformation or failure. It is a measure of the maximum load that a bearing can handle under specific operating conditions. The load-carrying capacity is influenced by several factors, including the bearing size, design, material, lubrication, operating speed, and temperature.

Radial bearings are designed to primarily support radial loads, which are forces acting perpendicular to the shaft’s axis. These loads can include the weight of rotating components, belt tension, pulley forces, or other radial forces. The load-carrying capacity of a radial bearing is specified for radial loads and is typically provided by the manufacturer in terms of dynamic load rating and static load rating.

Dynamic Load Rating:

The dynamic load rating of a radial bearing indicates the maximum radial load that the bearing can withstand under ideal operating conditions, with a calculated 90% reliability over a specified number of revolutions or operating hours. It represents the load at which the bearing is expected to have a basic rating life of one million revolutions.

The dynamic load rating takes into account factors such as the bearing’s geometry, material properties, and internal design, which affect its ability to distribute the load and resist fatigue failure. It is expressed in units of force (often in Newtons or pounds) and is provided by the bearing manufacturer. When selecting a radial bearing, it is crucial to ensure that the anticipated radial load falls within the dynamic load rating to prevent premature bearing failure.

Static Load Rating:

The static load rating of a radial bearing refers to the maximum radial load that the bearing can withstand without permanent deformation or damage while stationary. Unlike the dynamic load rating, the static load rating does not account for the bearing’s ability to handle fatigue-related failures over a specified number of revolutions but focuses on the load capacity under static conditions.

The static load rating is typically higher than the dynamic load rating due to the absence of rotational forces and associated fatigue effects. It provides an indication of the bearing’s ability to support heavy loads without undergoing permanent deformation. Like the dynamic load rating, the static load rating is expressed in units of force and is provided by the bearing manufacturer. It is crucial to ensure that the static load rating exceeds the anticipated radial load to prevent bearing damage or failure.

Load Rating Calculation:

The load ratings of radial bearings are determined through standardized calculation methods based on industry standards, such as ISO and ANSI/ABMA standards. These calculations consider factors such as the bearing’s geometry, material properties, internal design, and expected operating conditions.

The load ratings are influenced by various factors, including the number and size of the rolling elements, the contact angle, the material strength, and the bearing’s internal clearance. Manufacturers perform extensive testing and analysis to determine the load ratings of their radial bearings and provide the values in their product catalogs to assist engineers and designers in selecting the appropriate bearing for specific applications.

In summary, the load-carrying capacity and load ratings of radial bearings play a critical role in determining their suitability for various industrial applications. The dynamic load rating indicates the maximum radial load that a bearing can handle under ideal operating conditions and a specified reliability level, while the static load rating represents the maximum radial load the bearing can withstand without permanent deformation while stationary. Understanding these load ratings is essential for selecting radial bearings that can reliably and safely support the anticipated loads in industrial machinery and equipment.

radial bearing

Are there specific types of radial bearings, and what are their unique characteristics?

Yes, there are several specific types of radial bearings, each with its unique characteristics and applications. These types of bearings are designed to accommodate different loads, operating conditions, and specific requirements. Here are some commonly used types of radial bearings along with their unique characteristics:

1. Deep Groove Ball Bearings:

Deep groove ball bearings are the most common type of radial bearings. They have deep raceway grooves that enable them to carry both radial and axial loads. Deep groove ball bearings are known for their versatility, high-speed capability, and relatively low cost. They are suitable for a wide range of applications, including electric motors, appliances, automotive components, and machinery.

2. Angular Contact Ball Bearings:

Angular contact ball bearings are designed to handle both radial and axial loads but primarily excel in supporting combined axial loads and moment loads. They have contact angles that allow them to carry higher thrust loads compared to deep groove ball bearings. Angular contact ball bearings are commonly used in applications such as machine tool spindles, automotive wheels, and pumps where precise axial and radial load support is required.

3. Cylindrical Roller Bearings:

Cylindrical roller bearings have high radial load-carrying capacity and are suitable for applications with heavy radial loads. They have cylindrical rollers as rolling elements and can accommodate axial displacement within the bearing. Cylindrical roller bearings are commonly used in industries such as construction equipment, gearboxes, and large motors.

4. Tapered Roller Bearings:

Tapered roller bearings are designed to handle both radial and axial loads. They have tapered raceways and rollers arranged in a way that allows the bearing to support higher axial loads in one direction. Tapered roller bearings are commonly used in automotive applications, including wheel bearings, transmissions, and differentials, as well as in industrial machinery such as mining equipment and machine tools.

5. Spherical Roller Bearings:

Spherical roller bearings can accommodate high radial loads and moderate axial loads. They have barrel-shaped rolling elements and self-aligning capabilities, allowing them to compensate for misalignment and shaft deflection. Spherical roller bearings are commonly used in heavy-duty applications such as mining, paper mills, and steel mills, where there are significant misalignment or heavy load conditions.

6. Needle Roller Bearings:

Needle roller bearings have cylindrical rollers that are much smaller in diameter compared to other radial bearings. They have a high length-to-diameter ratio, enabling them to handle high radial loads in a compact design. Needle roller bearings are commonly used in applications such as automotive transmissions, motorcycles, and industrial machinery.

7. Thrust Bearings:

Thrust bearings are designed to handle axial loads primarily and are often used in conjunction with radial bearings to support combined axial and radial loads. They come in various designs, including ball thrust bearings, cylindrical thrust bearings, and tapered roller thrust bearings. Thrust bearings are commonly used in automotive, aerospace, and industrial applications that require support for heavy axial loads.

8. Self-Aligning Ball Bearings:

Self-aligning ball bearings have two rows of balls and a spherical outer ring raceway, allowing them to accommodate misalignment between the shaft and housing. They can handle both radial and axial loads and are commonly used in applications where shaft misalignment is expected, such as conveyor systems, textile machinery, and agricultural equipment.

These are just a few examples of specific types of radial bearings, and there are many other variations and specialized designs available for specific applications. Each type of bearing has unique characteristics that make it suitable for particular operating conditions, load requirements, and performance expectations.

radial bearing

Can you provide guidance on the selection and sizing of radial bearings for specific applications?

Yes, guidance can be provided on the selection and sizing of radial bearings for specific applications. Choosing the right radial bearings involves considering various factors such as load requirements, speed, operating conditions, space limitations, and environmental factors. Here’s a detailed explanation of the steps involved in selecting and sizing radial bearings for specific applications:

1. Determine the Application Requirements:

The first step is to understand the specific requirements of the application. This includes identifying the load type (radial, axial, or a combination), magnitude, and direction. Determine the desired rotational speed, as well as any special operating conditions such as temperature extremes, exposure to contaminants, or presence of moisture. Consider any space limitations or design constraints that may impact the bearing selection.

2. Calculate the Load:

Calculate the applied loads on the bearing to determine the required load capacity. Consider both static and dynamic loads. Static loads are the forces acting on the bearing when the equipment is at rest, while dynamic loads are the forces generated during operation. It’s important to accurately calculate these loads based on the application’s operating conditions and the forces exerted on the bearing.

3. Determine the Bearing Type:

Based on the application requirements and load calculations, select the appropriate bearing type. Radial bearings include deep groove ball bearings, cylindrical roller bearings, spherical roller bearings, tapered roller bearings, and needle roller bearings, among others. Each bearing type has specific design characteristics that make them suitable for different types of loads and operating conditions.

4. Consider Bearing Size and Design:

Once the bearing type is determined, consider the size and design parameters. These include the bore diameter, outer diameter, and width of the bearing. The bearing size should be selected to handle the calculated loads and ensure proper fit within the equipment. Consider factors such as available space, shaft diameter, and housing design to determine the appropriate bearing size.

5. Choose the Bearing Material:

Select the bearing material based on factors such as load requirements, operating conditions, and environmental considerations. Common bearing materials include steel, stainless steel, ceramic, and various alloys. Consider properties such as strength, corrosion resistance, temperature resistance, and lubrication compatibility when choosing the bearing material.

6. Determine Lubrication Requirements:

Consider the lubrication requirements of the bearing. Determine the lubrication type (grease or oil) based on the application’s speed, temperature, and operating conditions. Calculate the required lubrication quantity and frequency to ensure proper lubrication and minimize friction and wear. Consider factors such as re-lubrication intervals and the availability of automated lubrication systems if applicable.

7. Evaluate Sealing and Protection:

Assess the need for sealing and protection features based on the application’s operating environment. Seals or shields can help prevent contamination ingress, retain lubrication, and protect the bearing from moisture, dust, or other contaminants. Choose the appropriate sealing solution based on factors such as the level of protection required, operating speed, and temperature conditions.

8. Consult Bearing Manufacturer or Expert:

If you are uncertain about the selection and sizing process, it is advisable to consult with the bearing manufacturer or seek guidance from a bearing expert. They can provide valuable insights and recommendations based on their expertise and experience. Provide them with detailed information about the application requirements, load conditions, and operating parameters to receive accurate guidance.

9. Consider Cost and Availability:

Finally, consider the cost and availability of the selected radial bearings. Evaluate factors such as the initial cost, expected service life, maintenance requirements, and the availability of replacement bearings when making the final selection. Balancing performance requirements with cost considerations is important to ensure a cost-effective and reliable bearing solution.

By following these steps and considering the specific requirements of the application, you can make informed decisions regarding the selection and sizing of radial bearings. It is important to continually monitor the performance of the bearings during operation and make adjustments if necessary to ensure optimal performance and reliability.

China Best Sales 128809K  85*45*220mm Mud Motor Radial Bearings   bearing driverChina Best Sales 128809K  85*45*220mm Mud Motor Radial Bearings   bearing driver
editor by CX 2024-04-10