Needle roller bearing
RNA6903 Bearings
2022-02-21
Needle roller bearing
RNA6901 Bearings
2022-02-20

RNA6902 Bearings

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Parameters of RNA6902 Bearings

Bearing TypeOpen 
Bore Dia (d)15.000mm
Outer Dia (D)28.000mm
Radius (min) (rs)0.30mm
Dynamic Load Rating (Cr)4,321N
Static Load Rating (Cor)2,259N
Max Speed (Grease)26,000rpm
Max Speed (Oil)30,000rpm
Ball Qty10 
Ball Dia (Dw)3.969mm
Width (B)7.000mm
Max. Shaft Shoulder Dia. Inner (Li)19mm
Min. Housing Shoulder Dia., Outer (Lo)24mm
Weight (g)9.00grams
PrecisionA1 
Standard ClearanceC0 
Material52100 Chrome steel, or equivalent

Cooperation Brands

Needle roller bearing

SKF Needle roller bearing

Timken  Needle roller bearing

Needle roller bearing

NSK  Needle roller bearing

Needle roller bearing

NTN Needle roller bearing

Needle roller bearing

Koyo Needle roller bearing

Needle roller bearing

NACHI Needle roller bearing

Product Description of Needle roller bearing

Application of Needle roller bearing

  1. Depending on the field of activity and application, needle roller and cage assemblies can be integrated between the rings to strengthen the assembly and ensure the connection between the various mechanical parts.
  2. Therefore, needle roller bearings come in many forms (cages, bushes, bearings with solid rings, combination bearings, needle roller thrust bearings, cam followers, etc.) to meet all technical constraints of the industrial market.
  3. The smallest cross-section in a rolling bearing is Needle roller and cage assemblies provide a very compact solution for applications where space is limited.
High load capacity
  1. Due to the large number of rollers, the needle roller and cage assembly has a high load-carrying capacity.
  2. The needle roller and cage assembly has high stiffness due to the large number of small diameter rollers.
  3. These bearings combine robustness, precision and durability across all industrial markets and are very common, especially in:car two wheelerPortable tools (drills, chainsaws) construction machinery,pump and motor.
Mechanical

Mechanical

Motor field

Motor field

Medical equipment

Medical equipment

Wind power

Wind power

Automotive-industry

Instrument

Instrument

Shipping & Package of Needle roller bearing

Shipping port: Qingdao/Tianjin
Supply Ability: 100,000 pieces per month
Package:

  1. Plastic bag + single box + carton + plywood pallet
  2. Neutral industrial packaging + neutral carton packaging + pallet
  3. According to customer requirements
Package
Package

Why choose us

  1. Sample requirements: Contact us via email or trade manager, we will send samples according to your requirements.
  2.  World-class bearings: We provide customers with world-class quality domestically produced bearings.
  3. OEM or non-support bearings: As we have a wealth of knowledge and connections in the industry, we can easily meet any requirements for non-standard bearings.
  4. Outstanding quality of genuine products: The company has been proving that it provides 100% quality products with genuine intentions.
  5.  After-sales service and technical assistance: The company provides after-sales service and technical assistance according to customer requirements and needs.
  6. Fast delivery: The company provides on-time delivery through its streamlined supply chain.
  7.  Cost-saving: We provide long-life, anti-vibration, high-reliability bearings with high quality and better performance. This increases cost savings.
  8.  Answer customers’ questions in time: We believe that if customers are satisfied, it proves our value.

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FAQ

Due to their internal design, ball bearings cannot usually be disassembled down to the component level; therefore, they cannot usually be refurbished.

Solid base shells are manufactured without cavities and fillers; they are stronger than hollow bases, and there are no traps for bacteria and fungi to grow. In the thermoplastic shell, the sturdy base will not break under steam or high-pressure washing. The hollow base saves material and weight to reduce costs. Some people use epoxy resin to backfill the hollow base to eliminate the trap of bacteria breeding, but this will not increase the strength, will cause the installation surface to be uneven, and water will seep between the shell and the filling material, causing cracking.

Use particularly thermally stable bearing rings, larger internal clearance (C4), specially selected lubricants that will not decompose at high temperatures, and zinc anodized flinger. There are two basic versions of our high temperature bearings. The suffix “C4HR5” represents the bearing that can withstand 400°F, and the suffix “C4HR23” represents the bearing that can withstand 450°F.

For critical applications such as pulp and paper processing, printing and packaging, material tearing can cause expensive downtime due to excessive torque and vibration.

The two biggest factors affecting the starting and running torque of the bearing are the seal design and lubricant selection. The shaft and bearing seat fit, component accuracy and surface finish, and retainer design also have some influence.

In higher speed applications, non-contact sealing devices are usually required to minimize operating torque and heat generation, so oil baffle rings and secondary sealing devices are usually required. Flowing oil lubrication systems are usually the best solution.

After proper installation, most seated bearings only need to be relubricated regularly with a small amount of grease and checked to ensure that they operate at low temperatures, quietness, and sufficient accuracy.

This depends on many factors, such as the application’s load conditions, operating speed, duty cycle, temperature, and operating environment. The technical information section of this website provides some basic information. Our engineers can help you determine more specific theoretical life calculations.

When noise and/or operating temperature increase or operating accuracy decreases, bearings should be replaced.

Lubricant of choice
Lubrication joint type or location
Sealing materials and design options
Dimensions, suitable for housing or insert
Fixing screw options
Paint the shell in any color

Too little or too much lubricant
Incorrect lubricant type
Poor bearing installation
Improper internal clearance
Excessive load and/or speed
Extreme temperature
Pollution
Movement between mounting surfaces

The noise emitted by the bearing may be caused by a combination of one or more factors, such as insufficient working clearance, excessive working clearance, changes in working clearance due to temperature, damage to the contact area, contamination, inappropriate lubricants or The raceway is damaged.

Lubricants have five basic functions for bearings:

Reduce friction
Reduce wear
Reduce temperature rise
Minimize corrosion
Seal contaminants

We do not recommend mixing grease. Mixing incompatible greases will cause the mixture to harden, preventing it from releasing any oil. Mixing incompatible greases can also soften the mixture, which releases all the oil. In either case, the mixture will not be able to properly lubricate the bearing. We strongly recommend using the same type of grease originally provided with the bearing.

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