RNA 4906 JNS 35x47x17 mm

RNA 4906 JNS 35x47x17 mm - Needle Roller Bearing Without Inner Ring

RNA 4906 JNS 35x47x17 mm is a radial needle roller bearing from the Japanese brand JNS (Nose Seiko), belonging to the RNA 49 dimensional series. It features an outer ring and needle rollers but no inner ring. The needle rollers operate directly on a suitably prepared shaft raceway. Its nominal dimensions are 35 mm roller set bore diameter (Fw), 47 mm outside diameter (D), and 17 mm width (C).

Technical Specifications - RNA 4906 JNS

The 35 mm dimension refers to the nominal diameter of the roller set bore and corresponding shaft raceway, not the bore of an inner ring.

Verified JNS Catalog Parameters

The following specifications are listed in the Nose Seiko needle roller bearing catalog for RNA 4906.

www.noc.ua

+1

The catalog recommends reducing the stated limiting speed to approximately 60% for grease lubrication. Actual permissible operating speed depends on the complete bearing arrangement.

These figures apply specifically to the JNS catalog entry. Load ratings and dimensions from other manufacturers should not be substituted without verification.

What Does RNA 4906 JNS Mean?

The designation identifies the bearing construction, dimensional series, size and manufacturer.

• RNA - Machined-ring needle roller bearing without an inner ring.

• 49 - Dimensional series of the needle roller bearing.

• 06 - Size code within the RNA 49 series.

• JNS - Japanese bearing brand manufactured by Nose Seiko Co., Ltd.

The basic designation RNA 4906 does not include a suffix indicating integrated seals, special internal clearance, precision class or a particular cage material.

The absence of these suffixes does not establish every internal specification. Manufacturer documentation should be consulted when such details are essential.

Construction and Operating Principle

RNA 4906 JNS is a radial needle roller bearing with a machined outer ring and needle-shaped rolling elements.

The bearing does not contain a separate inner ring. Instead, the needle rollers operate directly against the shaft surface, which serves as the inner raceway.

This construction offers several functional characteristics:

• Reduced radial installation space compared with an arrangement requiring a separate inner ring.

• A relatively large number of rolling elements within a compact bearing cross-section.

• Radial load support through line contact between the needle rollers and raceways.

• The possibility of using a separate inner ring when the shaft cannot serve as a suitable raceway.

The shaft must have appropriate surface hardness, dimensional accuracy, geometry and surface finish.

RNA 4906 JNS is designed primarily for radial loads. It should not be used as the sole means of axial shaft location.

RNA 4906 JNS vs NA 4906 JNS

The primary difference between these two bearing configurations is the presence of an inner ring.

The JNS catalog identifies IR 303517 as the corresponding inner ring and NA 4906 as the bearing designation with an inner ring.

www.noc.ua

Before changing from RNA 4906 to NA 4906, verify shaft diameter, installation width, fits and axial location.

These configurations are not automatically interchangeable in an existing machine.

Alternative Designations and References

The following formats refer to the same JNS product designation:

• RNA 4906 JNS

• JNS RNA 4906

• RNA4906 JNS

• JNS RNA4906

The basic designation RNA4906 is also used by other bearing manufacturers.

However, differences in dimensional standards and internal specifications may exist.

For example, the JTEKT/KOYO catalog lists an RNA4906 bearing with dimensions 35x47x18 mm, whereas the JNS catalog lists 35x47x17 mm.

koyo.jtekt.co.jp

+1

This difference is particularly important when selecting replacement bearings.

A matching basic designation does not guarantee identical width or full interchangeability between manufacturers.

RNA 4906 JNS vs RNA 5906 JNS

RNA 4906 and RNA 5906 are related needle roller bearings without inner rings, but they belong to different dimensional series.

The values are taken from the corresponding JNS catalog entries.

Mechanical Engineering

RNA 5906 has a greater width and different load ratings. It should not be treated as a direct replacement for RNA 4906 without checking the available axial space and bearing arrangement.

Bearing Selection and Interchangeability

Before ordering RNA 4906 JNS, confirm the complete designation and dimensional requirements.

The principal selection criteria include:

• Roller set bore diameter Fw 35 mm.

• Outside diameter D 47 mm.

• Bearing width C 17 mm.

• Shaft raceway hardness and surface finish.

• Shaft and housing dimensional tolerances.

• Required operating clearance.

• Radial load magnitude and distribution.

• Rotational speed and lubrication conditions.

• Operating temperature.

• Contamination protection.

• Axial location of the bearing assembly.

When replacing an existing bearing, pay particular attention to the manufacturer's specified width.

Bearings with the same basic designation may differ in dimensional or performance characteristics.

Typical Applications of RNA 4906 Needle Roller Bearings

Needle roller bearings without inner rings are commonly used in mechanical assemblies where the shaft can function as a hardened and ground raceway.

Typical application categories for this construction include:

• Compact industrial shaft supports.

• Mechanical drive assemblies.

• Industrial machinery with limited radial installation space.

• Rotating mechanisms subjected primarily to radial loads.

• Bearing arrangements designed around direct shaft raceways.

These are general applications of this bearing design, not confirmed OEM applications for the specific RNA 4906 JNS product.

Suitability must be determined from the actual loads, speeds, shaft design and operating conditions.

Installation and Maintenance

Shaft raceway preparation

The shaft must be suitable for direct contact with the needle rollers.

Check its surface hardness, finish, geometry and dimensional accuracy before installation.

A shaft that does not meet the required raceway conditions may cause premature bearing damage.

Housing installation

The outer ring must be installed using the correct fit and mounting procedure.

When press-fitting the bearing into the housing, apply installation force to the outer ring rather than through the rolling elements.

Lubrication

RNA 4906 JNS has an open construction and requires appropriate lubrication.

Lubricant selection should account for load, speed, operating temperature and environmental conditions.

The catalog limiting speed of 11,000 rpm applies to oil lubrication. Grease lubrication requires a lower limiting speed according to the manufacturer's guidance.

Protection and storage

Protect the bearing from moisture, abrasive particles and other contaminants.

Store it in a clean, dry environment and retain the protective packaging until installation.

Frequently Asked Questions - RNA 4906 JNS

1. What are the dimensions of RNA 4906 JNS?

RNA 4906 JNS has a roller set bore diameter of 35 mm, an outside diameter of 47 mm and a width of 17 mm. Its dimensional specification is 35x47x17 mm.

2. Does RNA 4906 JNS include an inner ring?

No. The bearing is designed without an inner ring. Its needle rollers run directly on a suitable shaft raceway.

3. What is the dynamic load rating of RNA 4906 JNS?

The JNS catalog specifies a basic dynamic load rating Cr of 25,200 N.

4. What is the static load rating of RNA 4906 JNS?

The catalog basic static load rating C0r is 34,700 N.

5. What is the limiting speed of RNA 4906 JNS?

The JNS catalog specifies 11,000 rpm for oil lubrication. The manufacturer recommends reducing this value to approximately 60% for grease lubrication.

6. Which inner ring is compatible with RNA 4906 JNS?

The JNS catalog identifies IR 303517 as the corresponding inner ring.

7. Are RNA 4906 and NA 4906 identical?

No. RNA 4906 is supplied without an inner ring, while NA 4906 includes one. The nominal shaft diameters and installation requirements differ.

8. Can RNA 4906 JNS be replaced by another manufacturer's RNA4906 bearing?

Only after checking the complete dimensions and technical specifications. Some manufacturers list RNA4906 with an 18 mm width rather than the 17 mm specified by JNS.

RNA 4906 JNS - Key Product Information

RNA 4906 JNS is a radial needle roller bearing manufactured by the Japanese company Nose Seiko. It belongs to the RNA 49 series and has dimensions of 35x47x17 mm. The bearing has no inner ring, allowing the needle rollers to operate directly on a prepared shaft raceway. Its corresponding inner ring is IR 303517.

RNA 4906 JNS is offered by simmering.pl, a specialist supplier of industrial bearings and mechanical components based in Lublin, Poland. The company serves industrial customers and maintenance departments, with stock in Poland and international shipping services.