China wholesaler Used for Kamaz Trucks Belt Pulley of Front Axle Retail Bearing Single Row pulley alternator

Product Description

20mm Drawn Cup Needle Roller Bearing HK2016 HK2571


Needle roller bearings (needle bearing) is a cylindrical roller with a roller bearing, relative to its diameter, roller both thin and long. This is called needle roller. Despite having a smaller cross-section, has a higher load bearing capacity, equipped with a thin and long needle bearing roller (roller diameter D2.5, L is the length of the roller), therefore radial structure is compact, its diameter size and load capacity and other types of bearings, minimum diameter, especially for radial mounting dimensions restricted support structure.

According to different occasions, can be used without inner ring of the bearing or needle roller and cage assembly, when the surface of the journal bearing surface and shell holes as bearing directly match the outer rolling surface, in order to ensure the load capacity and operating performance and have the same ring bearing, shaft or housing bore raceway surface hardness, machining accuracy and surface quality should be similar roller bearing rings. Such bearings can only bear radial load.

Needle roller bearings are widely used in cars, compressors, construction, electric motors, food industry, home appliances etc. As a rolling element, it turns the world.


Product Description


Drawn Cup Needle Roller Bearing HK384825 TA 3825 Size 38*48*25mm for baw BAW




Needle Roller Bearings




Chrome Steel


Plastic Bag and Box

Payment Item

T/T ,Western Union , Paypal ,Credit card

Delivery time


1.Bearing Specifications :
Needle roller bearings use long, thin cylindrical rollers to support radial loads. These needle rollers have a length that is
typically 3 to 4 times its diameter. Needle roller bearings have a thinner cross section than other roller bearings and are ideal for limited-space applications that require carrying heavy loads. Drawn cup needle roller bearings have a deeply drawn, thin-walled outer ring. Caged drawn cup units contain a one-piece cage to guide and retain the rollers. Full-complement drawn cup units include the maximum number of rollers that can be retained by the outer shell. The drawn design allows for cost-effective accommodation of heavy radial loads. Needle roller and cage assemblies do not contain inner or outer rings. Instead, the self-contained bearing components work with a shaft or housing bore used as a raceway.


Product Parameters


oduct Name

Needle Roller Bearing



Model Number




Quality Control Process


2.Windage test


4.Rotary test

5.Greasing and gland

6.Noise inspection

7.Appearance inspection

8.Rust prevention

9.Product packaging


Medical equipment,cryogenic engineering,optical instrument,high-speed motor,printing machinery,food processing machinery.


Our Advantages

Advantages of needle roller bearings

Needle roller bearings are equipped with thin and long rollers. Therefore, the radial structure is compact.

When the inner diameter and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for the support structure with limited radial installation size.

Needle roller bearings should be combined with bearing rings and applications depending on the application occasions, machining accuracy and surface quality




Product Application

2.Application of Bearing :
1.Needle roller bearing: used in automobile engine, transmission, crawler wheel of excavator, compressor, crane, etc.2.Combined needle roller bearing is widely used in machine tools, metallurgical machinery, textile machinery, printing machinery and other mechanical equipment, and can make the mechanical system design very compact and smart.

Company Profile


Packaging & Shipping

1) Inner Plastic Bag+ Paper Box + Carton(+Pallet);  
2) Small sizes:Plastic Tube + Carton  
3) Big sizes:Wooden Case    
1)Less than 45 KGS, we will send by express. (Door to Door, Convenient)
2)Between 45 – 200 KGS, we will send by air transport. (Fastest and safest, but ?expensive )
3)More than 200 KGS, we will send by sea. (Cheapest and usual) 


Q: Are you trading company or manufacturer ?

 A: We are factory.We have our own brand:.If you interested in our product,I can take you to visit our factory.

 Q: How long is your delivery time?
 A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is  according to quantity.

Q: Where is your factory located? How can I visit there?
 A: Our factory is located in ZheJiang Province,You can take the high-speed rail or plane to visit.

Q: Do you provide samples ? it is free charge?
 A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q:The MOQ is how much?
 A: About ordinary standard type of bearing ,We have rich inventory,not have MOQ,if your need a 
     product is Non-standard size,need customize,we will according the product size to determine the MOQ.


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Cage: Without Cage
Rows Number: Single
Load Direction: Radial Bearing
Style: With Inner Ring
Material: Bearing Steel
Type: Open
US$ 0.01/Set
1 Set(Min.Order)

Request Sample

bearing pulley

What environmental factors should be considered when using bearing pulleys outdoors?

When using bearing pulleys outdoors, several environmental factors should be taken into consideration to ensure optimal performance and longevity of the pulley system. Here are some important environmental factors to consider:

1. Temperature and Climate:

Outdoor environments can experience a wide range of temperatures and climate conditions. Extreme heat or cold can affect the performance and lifespan of bearings and pulleys. It is essential to choose bearings and lubricants that can withstand the anticipated temperature range and to provide appropriate insulation or ventilation if necessary.

2. Moisture and Corrosion:

Outdoor environments often expose bearing pulleys to moisture, rain, humidity, and other corrosive elements. Corrosion-resistant materials, such as stainless steel or coated bearings, should be used to prevent rust and deterioration. Regular inspection and maintenance, including cleaning and re-lubrication, can help mitigate the effects of moisture and corrosion.

3. Contaminants and Particles:

Outdoor settings may contain dust, dirt, sand, or other particles that can enter the bearing pulleys and cause damage or increased wear. Proper sealing and protective measures, such as shields or seals, should be implemented to minimize the ingress of contaminants. Regular cleaning and inspection are necessary to remove any accumulated debris.

4. UV Exposure:

Exposure to ultraviolet (UV) radiation from sunlight can degrade certain materials and lubricants over time. Bearing pulleys used outdoors should be made of UV-resistant materials or be protected with coatings or covers that can withstand prolonged sun exposure. UV-resistant lubricants should also be used to maintain optimal performance.

5. Outdoor Debris and Obstacles:

Outdoor environments may have additional challenges such as falling leaves, branches, or other debris that can interfere with the proper operation of bearing pulleys. Regular inspection and cleaning are necessary to remove any obstructions that could affect the belt alignment or cause pulley damage.

6. Vibration and Wind Loads:

Outdoor environments often involve exposure to vibrations and wind loads. These factors can impact the stability and performance of bearing pulleys. Proper anchoring and reinforcement of the pulley system can help mitigate the effects of vibrations and wind loads, ensuring reliable operation.

By considering these environmental factors and implementing appropriate measures, such as selecting the right materials, providing adequate sealing and protection, and conducting regular maintenance, the performance and lifespan of bearing pulleys used outdoors can be optimized. It is recommended to consult manufacturers’ guidelines, industry standards, and experts in bearing technology for specific recommendations based on the environmental conditions and requirements of the outdoor application.

bearing pulley

Can bearing pulleys withstand heavy loads and high-speed rotations?

Yes, bearing pulleys are designed to withstand heavy loads and high-speed rotations, provided that they are selected and used appropriately for the specific application requirements. Here are some key factors to consider:

1. Load Capacity:

Bearing pulleys are available in various load capacities, ranging from light-duty to heavy-duty options. The load capacity of a pulley depends on factors such as its size, construction, bearing type, and material. It is crucial to select a pulley with an adequate load rating that can handle the expected loads in the application.

2. Bearing Type:

The type of bearing used in the pulley plays a significant role in determining its ability to withstand heavy loads and high-speed rotations. Common types of bearings used in pulleys include deep groove ball bearings, angular contact bearings, and cylindrical roller bearings. These bearings are designed to handle radial and axial loads, providing robust support for the pulley.

3. Material and Construction:

The material and construction of the pulley itself also contribute to its load-bearing capacity. Pulleys are commonly made from materials such as steel, cast iron, aluminum, or engineered plastics. The choice of material depends on factors such as load requirements, durability, and environmental conditions.

4. Proper Installation:

To ensure the pulley can withstand heavy loads and high-speed rotations, it is crucial to follow proper installation practices. This includes correctly aligning the pulley, ensuring proper tensioning of belts, and securely mounting the pulley on the shaft. Improper installation can lead to increased stress on the pulley and bearings, potentially resulting in premature failure.

5. Lubrication and Maintenance:

Regular lubrication and maintenance are essential for the optimal performance of bearing pulleys under heavy loads and high-speed rotations. Adequate lubrication reduces friction, dissipates heat, and helps prevent premature wear. Following the manufacturer’s recommendations for lubrication intervals and using the appropriate lubricant is crucial.

It is important to consult the manufacturer’s specifications and guidelines to ensure that the selected bearing pulleys are suitable for the specific application requirements, including the anticipated loads and operating speeds. By choosing the right pulley and implementing proper maintenance practices, bearing pulleys can effectively withstand heavy loads and high-speed rotations, providing reliable and efficient operation.

bearing pulley

How do bearing pulleys reduce friction and enhance the efficiency of systems?

Bearing pulleys play a crucial role in reducing friction and enhancing the efficiency of mechanical systems. Let’s explore how bearing pulleys achieve these benefits:

1. Friction Reduction:

Bearing pulleys incorporate bearings, typically ball bearings or roller bearings, into their design. These bearings are specifically engineered to minimize friction between the rotating pulley wheel and the axle or shaft on which it rotates. The bearings provide a low-friction interface that allows the pulley wheel to rotate smoothly with minimal resistance. By reducing friction, bearing pulleys prevent unnecessary energy losses due to heat generation and mechanical wear.

2. Smooth Operation:

The presence of bearings in pulleys ensures smooth operation of mechanical systems. Without bearings, the contact between the pulley wheel and the axle or shaft would result in increased friction and uneven motion. Bearings enable the pulley wheel to rotate with reduced friction, resulting in smooth and consistent operation. This smooth operation translates to improved system performance and reduced wear on the pulley and other components.

3. Energy Efficiency:

Bearing pulleys contribute to the energy efficiency of mechanical systems. By reducing friction, they minimize the amount of energy required to overcome resistance and rotate the pulley wheel. This improved energy efficiency can result in reduced power consumption and operating costs. In large-scale industrial applications where pulley systems are extensively used, the energy savings achieved through bearing pulleys can be significant.

4. Extended Lifespan:

The friction reduction provided by bearing pulleys helps extend the lifespan of the system. By minimizing frictional forces, bearing pulleys reduce the wear and tear on the pulley wheel, axle, and other components. This leads to less frequent maintenance, fewer component replacements, and increased durability of the system. The extended lifespan of the system translates to cost savings and improved reliability.

5. Load Distribution:

Bearing pulleys distribute loads more evenly across the system, enhancing efficiency. The bearings within the pulley share the weight and forces applied to the pulley, ensuring that the load is distributed over a larger surface area. This load distribution capability prevents excessive stress on specific points and reduces the risk of component failure. By evenly distributing the load, bearing pulleys optimize the efficiency and performance of the system.

In summary, bearing pulleys reduce friction by incorporating bearings into their design, enabling smooth operation and efficient power transmission. The friction reduction achieved by bearing pulleys enhances the energy efficiency of systems, extends the lifespan of components, and ensures the optimal distribution of loads. These benefits make bearing pulleys indispensable components in mechanical systems, improving their overall efficiency and performance.

China wholesaler Used for Kamaz Trucks Belt Pulley of Front Axle Retail Bearing Single Row   pulley alternatorChina wholesaler Used for Kamaz Trucks Belt Pulley of Front Axle Retail Bearing Single Row   pulley alternator
editor by CX