RNA 6901 JNS 16x24x22 mm

RNA 6901 JNS 16x24x22 mm - Needle Roller Bearing Without Inner Ring

RNA 6901 JNS 16x24x22 mm is a double-row radial needle roller bearing manufactured by JNS (Nose Seiko, Japan), belonging to the RNA 69 series. The bearing is designed without an inner ring, allowing the needle rollers to run directly on a suitably prepared shaft raceway. Its dimensions are 16 mm roller set bore diameter (Fw), 24 mm outside diameter (D), and 22 mm width (C). The bearing is primarily designed to support radial loads in compact mechanical assemblies.

Technical Specifications - RNA 6901 JNS

The dimensional and performance values are based on previously referenced JNS catalog data. The limiting speed of 23,000 rpm applies to oil lubrication. For grease lubrication, the JNS catalog guidance specifies approximately 60% of this value.

Important: The 16 mm dimension refers to the roller set bore diameter (Fw), not the bore of an inner ring. RNA 6901 JNS does not include an inner ring.

What Does RNA 6901 JNS Mean?

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

• RNA - Needle roller bearing with an outer ring and without an inner ring.

• 69 - Dimensional series within the needle roller bearing range.

• 01 - Size code within the bearing series. It does not directly indicate the shaft diameter.

• JNS - Japanese bearing manufacturer Nose Seiko Co., Ltd.

The basic designation RNA 6901 does not contain an additional suffix specifying special internal clearance, sealing arrangements, precision class, or cage design.

These characteristics should not be assumed without confirmation from the manufacturer's documentation.

Construction and Operating Principle

RNA 6901 JNS is a double-row radial needle roller bearing designed to accommodate radial loads while requiring relatively little radial installation space.

The bearing consists of an outer ring and two rows of cylindrical needle rollers arranged within the bearing assembly.

Unlike a needle roller bearing with an inner ring, RNA 6901 uses the shaft surface directly as the inner raceway.

This design eliminates the need for a separate inner ring and allows a compact bearing arrangement.

However, the shaft must meet the required specifications for:

• Raceway hardness and wear resistance.

• Surface roughness.

• Dimensional accuracy.

• Roundness and cylindricity.

• Correct running clearance.

• Lubrication conditions.

The bearing primarily accommodates radial loads and is not intended to serve as an independent axial locating bearing.

If the shaft cannot provide a suitable hardened and ground raceway, a compatible inner ring should be considered.

RNA 6901 JNS vs NA 6901 JNS

RNA 6901 and NA 6901 belong to related needle roller bearing designs, but they differ in their inner ring configuration.

The JNS catalog identifies IR 121622 as the compatible inner ring for RNA 6901.

When a suitable inner ring is installed, the arrangement corresponds in principle to the NA 6901 bearing configuration.

Correct fits, axial positioning, and assembly dimensions must be checked before installation.

Alternative Designations and Search References

The product may be identified using the following natural designation formats:

• RNA 6901 JNS

• JNS RNA 6901

• RNA6901 JNS

• JNS RNA6901

The designation RNA6901 is also used by other needle roller bearing manufacturers.

Bearings with corresponding basic dimensions may be available from brands such as SKF, INA, NTN, and KOYO.

However, matching dimensions and similar designations do not automatically guarantee identical load ratings, internal construction, tolerances, or operating characteristics.

Manufacturer-specific specifications must be compared before selecting an alternative.

RNA 6901 JNS vs RNA 4901

RNA 6901 and RNA 4901 are needle roller bearings without inner rings, but their widths and load-carrying characteristics differ.

The greater width of RNA 6901 provides a different bearing arrangement and load-carrying capacity.

The two bearings are not direct replacements where the available axial installation space is fixed.

Bearing Selection and Interchangeability

When selecting RNA 6901 JNS for a new installation or replacement, verify the complete designation and operating requirements.

The most important selection criteria include:

• Roller set bore diameter Fw 16 mm.

• Outside diameter D 24 mm.

• Bearing width C 22 mm.

• Shaft raceway hardness and surface finish.

• Housing bore tolerances and outer ring fit.

• Required operating clearance.

• Radial load magnitude and distribution.

• Rotational speed.

• Operating temperature.

• Lubrication method.

• Protection against contamination.

• Axial location of the bearing assembly.

A replacement bearing from another manufacturer should be selected only after confirming dimensional and functional compatibility.

Identical bearing dimensions do not necessarily mean complete interchangeability.

Typical Applications of RNA 6901 Needle Roller Bearings

Needle roller bearings without inner rings are commonly considered for mechanical assemblies where the shaft can function as a hardened raceway.

Typical applications for this bearing design include:

• Compact industrial shaft supports.

• Rotating mechanical assemblies.

• Machinery with limited radial installation space.

• Mechanisms requiring radial load support.

• Industrial drive and transmission assemblies where the shaft and housing are designed for needle roller bearings.

These are general applications associated with this type of bearing, not verified OEM applications for the specific JNS RNA 6901 part number.

The suitability of RNA 6901 JNS must always be evaluated against the actual machine operating conditions.

Installation and Maintenance

Shaft and housing preparation

Before installation, inspect the shaft raceway and housing bore for damage, contamination, dimensional errors, and surface defects.

The shaft surface must meet the requirements for direct contact with needle rollers.

Correct installation force

When installing the bearing into the housing, apply the mounting force to the outer ring.

Do not transmit mounting forces through the needle rollers, as this may damage the rolling elements or raceways.

Lubrication

RNA 6901 JNS is an open needle roller bearing and requires suitable lubrication during operation.

The lubricant and relubrication method should be selected according to the operating speed, load, temperature, and environmental conditions.

The catalog limiting speed should not be interpreted as a universally permissible operating speed.

Storage

Store the bearing in a clean, dry environment and keep it in its protective packaging until installation.

Avoid exposure to moisture, dust, and aggressive chemicals.

Frequently Asked Questions - RNA 6901 JNS

1. What are the dimensions of RNA 6901 JNS?

RNA 6901 JNS has a roller set bore diameter of 16 mm, an outside diameter of 24 mm, and a width of 22 mm. Its dimensional specification is 16x24x22 mm.

2. Does RNA 6901 JNS have an inner ring?

No. RNA 6901 JNS is designed without an inner ring. The needle rollers run directly on a suitably hardened and finished shaft raceway.

3. Is RNA 6901 JNS a double-row needle roller bearing?

Yes. The bearing incorporates two rows of needle rollers within its outer ring assembly.

4. What is the load rating of RNA 6901 JNS?

The previously referenced JNS catalog values are 17,100 N dynamic radial load rating and 23,000 N static radial load rating.

These values should be considered together with the actual operating conditions when evaluating bearing suitability.

5. What is the limiting speed of RNA 6901 JNS?

The catalog limiting speed is 23,000 rpm with oil lubrication. For grease lubrication, JNS guidance specifies a reduced speed of approximately 60% of the oil-lubricated value.

Actual permissible speed depends on load, lubrication, temperature, fits, and operating conditions.

6. Which inner ring is compatible with RNA 6901 JNS?

The compatible inner ring identified in the JNS catalog is IR 121622.

The inner ring must be correctly fitted and positioned within the bearing assembly.

7. Are RNA 6901 and NA 6901 the same bearing?

No. RNA 6901 is supplied without an inner ring, while NA 6901 includes an inner ring. Their shaft installation requirements are therefore different.

8. Can RNA 6901 JNS be replaced with another manufacturer's bearing?

A corresponding RNA6901 bearing from another manufacturer may be considered after verifying dimensions, tolerances, load ratings, internal construction, and operating conditions.

RNA 6901 JNS - Key Product Information

RNA 6901 JNS is a double-row radial needle roller bearing manufactured by the Japanese company Nose Seiko. It has dimensions of 16x24x22 mm and belongs to the RNA 69 series. Its open construction has no inner ring, allowing the needle rollers to operate directly on a suitable shaft raceway. The compatible inner ring designation is IR 121622.

RNA 6901 JNS is offered by simmering.pl, a specialist supplier of industrial bearings and mechanical components based in Lublin, Poland. The company serves industrial and maintenance customers, with stock in Poland and international shipping services.