Product Description

NSK KT192317 Needle Roller Bearing 19mm Inner Diameter Bearings

Product Name 

NSK KT192317 Needle Roller Bearing 19mm Inner Diameter Bearings



Model Number


Ring Material

Gcr15/ Carbon Steel/ Stainless Steel

Cage Material 



P0, P6, P5, P4,P2 or as requested


ZV1, ZV2, ZV3, or as requested


C0,C2,C3, or as requested 


Widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery and printing machinery etc.


Long life, high temperature resistance, corrosion resistance, ultra high speed.

Quality standard

ISO9001:2000/ SGS

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

Needle bearing

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 the small cross-section, the bearing still has a high load bearing capacity, and the needle bearing is equipped with a thin and long roller (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact, its inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, and it is especially suitable for support structures with limited radial mounting dimensions.

Other Needle roller bearing models : 

Bearing Number Boundary dimensions(mm) Moment(Nm) Basic load ratings(N) Mass(g)
  Fw D C Md Cr Cor (Approx.)
HF3530 35 42 30 121 3900 3900 58
HF2520 25 32 20 66 5500 5500 30.9
HF3571 30 37 20 90 4500 4500 36
HF3520 35 42 20 121 3900 3900 40
HF1616 16 22 16 20.5 8500 7500 14
HF1816 18 24 16 24.1 7500 7500 15.5
HF2016 20 26 16 28.5 7000 6500 17
HF1012 10 14 12 5.3 14000 11000 4
HF1216 12 18 16 12.2 10000 7000 10.5
HF1416 14 20 16 17.3 9500 8000 13
HF0409 4 8 6 0.34 34000 14000 1
HF0612 6 10 12 1.76 23000 13000 3
Bearing Number Boundary dimensions(mm) Basic load ratings(N) Limiting speeds(rpm) Mass(g)
  Fw Ew Bc Cr Cor Oil (Approx.)
K5X8X10TN 5 8 10 2800 2450 37000 0.9
K5X8X8TN 5 8 8 2300 1880 37000 0.7
K6X10X13TN 6 10 13 3500 2800 33000 1.3
K6X9X10TN 6 9 10 3300 3100 35000 1
K6X9X8TN 6 9 8 25600 2240 35000 0.8
K7X10X10TN 7 10 10 3350 3400 32000 1.1
K7X10X8TN 7 10 8 2750 2550 32000 0.9
K8X11X10TN 8 11 10 3830 3950 30000 1.7
K8X11X13TN 8 11 13 5000 5700 30000 1.8
K8X11X8TN 8 11 8 3000 2900 30000 1.1
K8X12X10TN 8 12 10 4900 4600 30000 1.3
K9X12X10TN 9 12 10 4200 4700 30000 1.5
K9X12X13TN 9 12 13 5500 6700 30000 1.9
K10X13X10TN 10 13 10 4500 5250 27000 1.6
Bearing Number Boundary dimensions(mm) Basic load ratings(N) Limiting speeds(rpm) Mass(g)
  Fw D C Cr Cor Oil (Approx.)
NK5/10TN 5 10 10 2100 1400 36780 2.9
NK8/12TN 8 15 12 3050 3650 29112 8.3
NK10/12TN 10 17 12 4750 5350 23500 10
NK12/12 12 19 12 6050 6400 21640 11.8
NK12/16 12 19 16 8200 9800 21640 16.8
NK14/16 14 22 16 8260 9600 18322 20.8
NK15/12 15 23 12 8600 10070 21004 18.5
NK16/20 16 24 20 10400 16800 15522 23.9
NK16/16 16 24 16 9030 11900 15522 20.8
NK17/16 17 25 16 9000 13500 14163 21.5
NK18/20 18 26 20 10500 13800 13628 30.5
NK202620 20 26 20 10500 11900 9125 17.2
NK203312SX 20 33 12 13000 17500 11124 29.1
NK20/16 20 28 16 11500 13400 12716 25.7
NK20/20 20 28 20 12400 21800 12716 29.3
Bearing Number Boundary dimensions(mm) Basic load ratings(N) Limiting speeds(rpm) Mass(g)
  Fw D C Cr Cor Oil (Approx.)
RNAV4002 21.87 32 17 10800 29800 4500 45
RNAV4003 24.3 35 18 17900 37900 4300 62
RNAV4004 28.7 42 22 28150 60900 3900 114
RNAV4005 33.5 47 22 33800 70800 3700 129
RNAV4006 40.1 55 25 49900 96500 3500 193
RNAV4007 45.9 62 27 47600 122800 3100 259
RNAV4008 51.6 68 28 49900 137900 2700 304
RNAV4009 57.4 75 30 52500 153500 2600 390
RNAV4571 62.1 80 30 55700 166000 2500 426
RNAV4011 69.8 90 35 68500 225800 2300 645
RNAV4012 74.6 95 35 75400 239000 2100 677
RNAV4013 80.3 100 35 79500 256900 1900 692
RNAV4014 88 110 40 98800 354900 1700 950
RNAV4015 92.7 115 45 101800 372900 1600 1000
RNAV4016 100.3 125 45 157100 373500 1500 1400
RNAV4017 104.8 130 45 103800 374800 1400 1540
Bearing Number Boundary dimensions(mm) Basic load ratings(N) Limiting speeds(rpm) Mass(g)
  Dc1 Dc Dw Cr Cor Oil (Approx.)
AXK571TN  4 14 2 4380 7500 18000 0.7
AXK571TN 5 15 2 4680 9100 17000 0.8
AXK0821TN 8 21 2 7750 19000 15000 2
AXK1571 10 24 2 9150 24500 14000 3
AXK1226 12 26 2 9860 28600 13000 3
AXK1528 15 28 2 11200 35500 11000 4
AXK1730 17 30 2 11800 38600 10000 4
AXK2035 20 35 2 12900 45600 8500 5
AXK2542 25 42 2 13800 57800 7000 7
AXK3047 30 47 2 15600 69500 6000 8
AXK3552 35 52 2 16900 85710 5500 10
AXK4060 40 60 3 27500 113500 4700 16
AXK4565 45 65 3 29050 127600 4200 18





Q:Why choose us?                                                        

A:1. We are professional,have factory in ZheJiang for many years.

   2. We are experienced for 10 years.

   3. We can offer a various kind of bearing with high quality:Z1V1,Z2V2,Z3V3 and best price


Q:How is the quality of your products?                             

A:The same quality, we have lower price.The same price,we have better quality.


Q:Except Needle roller bearing,what other main bearing do you have?

A:Self-alaigning ball bearing,Cylindrical roller bearing,Taper Roller Bearing,Thrust roller bearing,Spherical roller bearing,Deep groove ball bearing,Angular contact ball bearing etc.


Q:Can I get Needle roller bearing free samples?                                                 

A:We will charge a little sample fee for our regular designs or customized ones, These charges will be refunded to you when your mass production order is confirmed.


Q:Can you make the products as our requirement?     

A:We have more than 10years’ OEM experience. We supply products fo more than 300 automobile parts factories.




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Product Name: Kt192317 Needle Roller Bearing
Width: 19mm
Bore Diameter: 23mm
US$ 0.1/Piece
1 Piece(Min.Order)


Order Sample



Customized Request

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Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

steel ball bearing

Are there specific considerations for choosing steel ball bearings in applications with varying loads or operating conditions?

When selecting steel ball bearings for applications with varying loads or operating conditions, there are several specific considerations to keep in mind. The performance and longevity of the bearings depend on factors such as load magnitude, load direction, speed, temperature, and environmental conditions. Here are the key considerations for choosing steel ball bearings in such applications:

1. Load Capacity:

The load capacity of a steel ball bearing refers to its ability to withstand applied loads without excessive deformation or failure. In applications with varying loads, it’s important to consider both the static and dynamic load ratings of the bearing. The static load rating indicates the maximum load the bearing can handle when it is stationary, while the dynamic load rating represents the load it can support during continuous rotation. By comparing the expected loads in the application to the load ratings of different bearing models, you can select a bearing with an appropriate load capacity to handle the varying loads effectively.

2. Load Type and Direction:

The type and direction of the loads in the application also influence the choice of steel ball bearings. Bearings can typically handle radial loads (perpendicular to the shaft axis), axial loads (parallel to the shaft axis), or a combination of both. Depending on the specific application, you need to consider whether the loads are predominantly radial, axial, or a combination. This consideration helps determine the appropriate bearing type, such as deep groove ball bearings for radial loads, angular contact ball bearings for combined radial and axial loads, or thrust bearings for predominantly axial loads.

3. Speed Capability:

The speed capability of steel ball bearings is an essential consideration for applications with varying operating speeds. High-speed applications require bearings that can withstand the centrifugal forces and minimize frictional heat generation. Factors such as cage design, lubrication, and bearing precision contribute to the speed capability of the bearing. It’s important to select bearings specifically designed for the anticipated operating speeds to ensure reliable performance and avoid issues like excessive heat, premature wear, or bearing failure.

4. Temperature Range:

The temperature range in which the steel ball bearings will operate is a critical consideration. High temperatures can cause dimensional changes, reduced lubricant viscosity, and accelerated wear, while extremely low temperatures can affect the bearing’s material properties and lubrication characteristics. It’s important to choose bearings with appropriate heat treatment and cage materials that can withstand the anticipated temperature range. In extreme temperature conditions, specialized bearings with high-temperature grease or materials like stainless steel or ceramic may be required.

5. Environmental Factors:

Environmental factors, such as humidity, dust, chemicals, and contaminants, can significantly affect the performance and durability of steel ball bearings. In applications with varying environmental conditions, it’s crucial to consider additional protection measures, such as appropriate seals or shields, to prevent the ingress of contaminants and maintain reliable operation. Bearings with enhanced corrosion resistance or sealed designs may be necessary in harsh environments to prevent premature wear, rust, or degradation of performance.

6. Lubrication and Maintenance:

Proper lubrication is essential for the reliable operation and longevity of steel ball bearings. In applications with varying loads or operating conditions, it’s important to consider the lubrication requirements and maintenance intervals. Factors such as speed, temperature, and load magnitude influence the choice of lubricant type, viscosity, and replenishment frequency. Adequate lubrication ensures reduced friction, minimized wear, and enhanced bearing performance. It’s important to follow manufacturer recommendations and establish a regular maintenance schedule to optimize bearing life in applications with varying operating conditions.

7. Application-Specific Considerations:

Each application may have unique requirements and constraints that need to be considered when selecting steel ball bearings. Factors such as space limitations, noise restrictions, mounting considerations, and alignment requirements may influence the bearing choice. Consulting with bearing manufacturers or industry experts can help identify specific considerations and select the most suitable bearings for applications with varying loads or operating conditions.

In summary, choosing steel ball bearings for applications with varying loads or operating conditions requires careful consideration of load capacity, load type and direction, speed capability, temperature range, environmental factors, lubrication requirements, and application-specific considerations. By selecting bearings that are specifically designed to handle the anticipated conditions, you can ensure optimal performance, longevity, and reliability in your application.

steel ball bearing

Can steel ball bearings be customized or modified for unique industrial needs?

Yes, steel ball bearings can be customized or modified to meet unique industrial needs. Manufacturers offer various options for customization and modification to ensure that the bearings align with specific requirements. Let’s explore some of the ways steel ball bearings can be customized:

1. Bearing Size and Configuration:

Steel ball bearings can be customized in terms of size, including the outer diameter, inner diameter, and width. Manufacturers can produce bearings in a wide range of sizes to accommodate different shaft and housing dimensions. Additionally, the configuration of the bearing, such as the number and arrangement of balls, can be modified to optimize load capacity, speed, or specific operating conditions.

2. Material Selection:

While steel is the most common material used for ball bearings, there are different types of steel with varying properties. Manufacturers can offer customized steel ball bearings made from specific grades of steel to enhance performance characteristics such as corrosion resistance, high-temperature resistance, or hardness. In some cases, alternative materials such as stainless steel or specialty alloys may be used to meet unique industrial requirements.

3. Seal or Shield Options:

Bearings can be customized with different seal or shield options to provide enhanced protection against contamination, moisture, or chemicals. Manufacturers can offer various sealing configurations, such as rubber seals, metal shields, or labyrinth seals, to suit specific environmental conditions and prevent the ingress of particles or fluids into the bearing. Customized sealing solutions can help prolong bearing life and improve reliability in challenging industrial environments.

4. Lubrication:

The lubrication of steel ball bearings can be customized based on the specific application requirements. Manufacturers can offer a range of lubrication options, including different types of lubricants and greases with varying viscosities, additives, or properties. Customized lubrication solutions ensure optimal performance, reduce friction, and enhance the bearing’s ability to withstand high temperatures, extreme loads, or harsh operating conditions.

5. Cage Design:

The cage, or retainer, holds the balls in position within the bearing and ensures proper ball guidance and spacing. Steel ball bearings can be customized with different cage designs, materials, or configurations. For example, cages can be made from steel, brass, or engineered polymers, each offering specific advantages such as improved heat dissipation, reduced friction, or enhanced durability. Customized cage designs can optimize the bearing’s performance in terms of speed, noise, or resistance to specific operating conditions.

6. Special Coatings or Surface Treatments:

In certain industries or applications, steel ball bearings may benefit from specialized coatings or surface treatments. These coatings can provide additional protection against corrosion, reduce friction, or enhance the bearing’s ability to withstand extreme temperatures or harsh chemicals. Customized coatings or surface treatments can be applied to the bearing’s outer surface, inner raceway, or balls to improve performance and extend the bearing’s lifespan.

7. Specialized Testing and Certification:

For industries with stringent quality or performance requirements, manufacturers can provide customized testing and certification services. This ensures that the steel ball bearings meet specific industry standards, regulations, or performance criteria. Customized testing may involve precision measurement, noise analysis, vibration testing, or endurance testing to verify the bearing’s performance and reliability in unique industrial applications.

By offering customization and modification options, manufacturers can tailor steel ball bearings to meet the unique needs of various industries, applications, and operating conditions. Customized bearings can deliver improved performance, durability, and reliability, ultimately enhancing the overall efficiency and productivity of industrial systems.

steel ball bearing

How do steel ball bearings contribute to reduced friction and smooth operation in machinery?

Steel ball bearings play a critical role in reducing friction and ensuring smooth operation in various machinery and mechanical systems. Let’s explore how steel ball bearings achieve these benefits:

1. Rolling Motion: Steel ball bearings operate on the principle of rolling motion. The small spherical balls within the bearing roll between the inner and outer raceways, rather than sliding against each other. This rolling motion significantly reduces friction compared to sliding friction that occurs in plain bearings or bushings. As a result, steel ball bearings minimize energy losses due to friction and enable more efficient operation of machinery.

2. Point Contact: Steel ball bearings feature point contact between the balls and the raceways. This means that only a small area of the ball is in contact with the raceway at any given time. Point contact reduces the contact surface area and, consequently, the frictional resistance. The reduced friction allows the bearing to rotate more freely and with minimal energy loss.

3. Lubrication: Proper lubrication is crucial for the smooth operation of steel ball bearings. Lubricants such as grease or oil are used to reduce friction and wear between the balls and the raceways. Lubrication forms a thin film between the contacting surfaces, providing a barrier that prevents direct metal-to-metal contact. This lubricating film further reduces friction and dissipates heat, improving the overall performance and longevity of the bearing.

4. Precision Manufacturing: Steel ball bearings are manufactured with high precision and tight tolerances. The dimensions, roundness, and surface finish of the balls and raceways are carefully controlled during the manufacturing process. This precision ensures that the balls roll smoothly and with minimal resistance within the bearing. The precise fit between the balls and the raceways contributes to reduced friction and promotes smooth operation.

5. Material Properties: Steel ball bearings are typically made from high-quality steel alloys that exhibit excellent mechanical properties. The steel used in ball bearings is hardened and heat-treated to enhance its strength, durability, and resistance to wear. These material properties allow the bearings to withstand high loads and provide reliable performance over extended periods. The smooth and hard surface of the steel balls also reduces friction and wear between the balls and the raceways.

6. Cage or Retainer: In many steel ball bearings, a cage or retainer is used to separate and maintain proper spacing between the balls. The cage prevents the balls from touching or rubbing against each other, ensuring smooth rolling motion. It also helps to distribute the load evenly among the balls, reducing stress concentrations and minimizing frictional resistance.

7. Noise and Vibration Reduction: Steel ball bearings contribute to the reduction of noise and vibration in machinery. The rolling motion of the balls and the precise fit between the balls and raceways minimize the occurrence of undesirable vibrations and noise generated by friction. This is particularly important in applications where quiet operation is essential, such as in precision machinery or automotive components.

In summary, steel ball bearings reduce friction and enable smooth operation in machinery through rolling motion, point contact, proper lubrication, precision manufacturing, high-quality materials, the use of cages or retainers, and noise/vibration reduction. These factors combined make steel ball bearings essential components in a wide range of applications, contributing to improved efficiency, durability, and performance of machinery and mechanical systems.

China supplier 1688 Kt192317 Nk40/30 Na4834 Na4907 Needle/Tapered/Cylindrical Roller/Thrust Ball/Needle/Stainless Steel Bearing with High Performance   with Good qualityChina supplier 1688 Kt192317 Nk40/30 Na4834 Na4907 Needle/Tapered/Cylindrical Roller/Thrust Ball/Needle/Stainless Steel Bearing with High Performance   with Good quality
editor by CX 2024-02-20

Steel Ball Bearings

As one of the leading steel ball bearings manufacturers, suppliers, and exporters of mechanical products, We offer steel ball bearings and many other products.

Please get in touch with us for details.

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