KOYO NUP 309-4 VH NR C3 45x100x25 mm - Single Row Cylindrical Roller Bearing

KOYO NUP 309-4 VH NR C3 - Product Characteristics

The KOYO NUP 309-4 VH NR C3 belongs to the family of single row cylindrical roller bearings designed primarily to accommodate radial loads.

Unlike deep groove ball bearings, cylindrical roller bearings use rollers that provide line contact with the raceways. This construction makes them suitable for mechanical systems requiring substantial radial load capacity.

The NUP configuration also provides axial location of the shaft in both directions. Its flange arrangement allows the bearing to function as a locating bearing within a properly designed shaft support system.

The NR feature provides an additional method of axial positioning of the outer ring within the housing.

The C3 radial internal clearance is greater than normal clearance and must be considered when selecting shaft and housing fits and evaluating operating temperature differences.

Technical Specifications - KOYO NUP 309-4 VH NR C3

What Does KOYO NUP 309-4 VH NR C3 Mean?

The complete designation identifies the bearing type, dimensional series, special design features, outer ring configuration and internal clearance.

NUP Bearing Configuration

An NUP cylindrical roller bearing has two integral flanges on the outer ring and one integral flange on the inner ring.

A separate thrust collar on the opposite side of the inner ring enables axial location in both directions.

This arrangement allows the bearing to support radial loads while restricting axial displacement between the shaft and housing.

The permissible axial load depends on the bearing's specific internal design, lubrication and operating conditions.

-4 and VH Designations

The -4 and VH elements are part of the complete KOYO product designation.

They must not be omitted when identifying the bearing or evaluating replacement options.

Without manufacturer documentation confirming their exact meaning for this particular reference, it would be inappropriate to assign a specific cage material, roller arrangement or internal geometry to these elements.

A bearing designated NUP 309-4 VH should not automatically be considered identical to a standard NUP 309.

NR - Snap Ring Groove and Snap Ring

The NR designation indicates an outer ring groove together with a retaining snap ring.

This feature allows the outer ring to be positioned or axially secured in a suitably designed housing.

The snap ring arrangement must match the housing design and its intended axial retaining function.

C3 - Radial Internal Clearance

C3 specifies radial internal clearance greater than the normal CN clearance range.

This may be required when interference fits or operating temperature differences reduce the bearing's internal clearance after installation.

C3 does not automatically indicate higher dynamic load capacity or a higher permissible rotational speed.

Construction and Operating Principle

The KOYO NUP 309-4 VH NR C3 cylindrical roller bearing consists of an inner ring, an outer ring and cylindrical rolling elements.

The rollers transmit loads between the raceways, primarily in the radial direction.

The NUP flange configuration and separate thrust collar provide axial guidance in both directions, allowing the bearing to function as a locating support.

The NR snap ring arrangement provides a means of securing the outer ring axially within a compatible housing.

As an open bearing design, the bearing requires an appropriate lubrication system and protection against contaminants within the surrounding mechanical assembly.

The exact internal design associated with -4 VH should be confirmed before specifying cage construction or special operating characteristics.

KOYO NUP 309-4 VH NR C3 Compared with Other NUP 309 Variants

Bearings within the NUP 309 dimensional family can share the same nominal dimensions while differing in internal clearance, retaining features and special construction.

The S02 element found in related KOYO references may identify a technically significant variation.

It must not be omitted or treated as interchangeable without manufacturer confirmation.

Likewise, a standard NUP 309 NR C3 is not automatically a direct replacement for NUP 309-4 VH NR C3, even when the nominal dimensions are identical.

Alternative Designations and Reference Formats

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

• KOYO NUP 309-4 VH NR C3

• NUP 309-4 VH NR C3 KOYO

• NUP309-4VHNRC3

• KOYO NUP309-4VHNRC3

• NUP 309-4 VH NR C3 45x100x25 mm

A related catalogue reference is KOYO NUP 309-4 VH NR S02 C3.

This reference belongs to the same dimensional family but includes the additional S02 element. Its technical equivalence to the designation without S02 must be verified.

No unverified OEM numbers or direct replacement references are assigned to the exact bearing designation.

Applications of KOYO NUP 309-4 VH NR C3

Single row NUP cylindrical roller bearings are used in mechanical assemblies requiring radial load support and axial location of a rotating shaft.

Typical applications for this bearing configuration include appropriately designed industrial gearboxes, drive assemblies and machinery shaft supports.

The NUP design is particularly relevant where the bearing must restrict axial shaft movement in both directions.

A related KOYO designation, NUP309-4VHNR S02C3, has been associated in parts catalogues with an ISUZU FORWARD transmission and OEM reference 1098101550.

However, this does not establish confirmed vehicle compatibility for the exact NUP 309-4 VH NR C3 variant without S02.

Specific equipment compatibility must be determined using the original bearing designation and the manufacturer's technical documentation.

Bearing Selection and Interchangeability

Before purchasing KOYO NUP 309-4 VH NR C3 or selecting a replacement, verify the following:

1. Complete manufacturer designation: NUP 309-4 VH NR C3, including all special design elements.

2. Mounting dimensions: 45 mm bore, 100 mm outside diameter and 25 mm width.

3. Radial internal clearance: C3 and its suitability for the intended operating conditions.

4. NUP configuration: Axial shaft location in both directions.

5. NR retaining arrangement: Compatibility with the housing and snap ring location.

6. Internal construction: Roller arrangement, cage design and any special manufacturer-specific features.

7. Operating requirements: Radial and axial loads, rotational speed, temperature and lubrication.

8. Additional suffixes: Particularly whether the original bearing includes S02.

A bearing from another manufacturer with dimensions of 45x100x25 mm is not automatically interchangeable.

Complete dimensional and functional compatibility must be established before replacement.

Installation and Operating Recommendations

Before installation, clean the shaft, housing bore and all mating surfaces. Check for dimensional accuracy, surface damage and contamination.

When mounting the bearing, apply installation force only to the ring being fitted with an interference fit.

Never transmit mounting force through the rollers and raceways.

Because the NUP configuration includes a separate thrust collar, correct positioning and assembly of this component are essential.

The NR snap ring must be correctly seated and must engage with the corresponding housing arrangement.

After installation, verify free rotation, appropriate operating clearance and correct axial location of the shaft.

Lubrication must follow the equipment manufacturer's requirements. The bearing should be stored in its original protective packaging in a clean, dry environment until installation.

Frequently Asked Questions - FAQ

What are the dimensions of KOYO NUP 309-4 VH NR C3?

The bearing has nominal dimensions of 45x100x25 mm. Its bore diameter is 45 mm, outside diameter is 100 mm and width is 25 mm.

What does NUP mean in a KOYO cylindrical roller bearing?

NUP identifies a single row cylindrical roller bearing configuration capable of locating a shaft axially in both directions. It is primarily designed to accommodate radial loads.

What does C3 mean in KOYO NUP 309-4 VH NR C3?

C3 indicates radial internal clearance greater than normal. The correct clearance must be selected according to mounting fits, temperature differences and operating requirements.

What does NR indicate in the bearing designation?

NR indicates a snap ring groove in the outer ring together with a snap ring. This arrangement allows axial retention of the outer ring in a compatible housing.

Can KOYO NUP 309-4 VH NR C3 accommodate axial loads?

Yes. The NUP configuration permits axial location in both directions and can accommodate limited axial loads. The permissible load depends on the specific bearing design, lubrication and operating conditions.

Can NUP 309 NR C3 replace NUP 309-4 VH NR C3?

Not automatically. The -4 and VH designations may identify important internal construction differences. Manufacturer documentation should be checked before substitution.

Are NUP 309-4 VH NR C3 and NUP 309-4 VH NR S02 C3 identical?

Exact equivalence has not been confirmed. The S02 variant appears in related catalogue references, but the additional designation must be considered technically significant until verified.

Is KOYO NUP 309-4 VH NR C3 supplied pre-lubricated?

Factory grease filling has not been confirmed for the exact bearing designation. Lubrication requirements should be determined from the equipment manufacturer's specifications.

KOYO NUP 309-4 VH NR C3 - Key Technical Information

KOYO NUP 309-4 VH NR C3 is a single row cylindrical roller bearing with dimensions of 45x100x25 mm. Its NUP construction provides axial shaft location in both directions. NR identifies a snap ring groove and snap ring, while C3 specifies increased radial internal clearance. The -4 VH design elements require verification when selecting replacements.

KOYO Bearings at simmering.pl

KOYO NUP 309-4 VH NR C3 is offered through simmering.pl, a specialist supplier of rolling bearings, industrial seals and technical components.

We serve industrial customers, maintenance departments, workshops and technical purchasing teams.

Our warehouse and order processing facilities are located in Lublin, Poland. We provide shipping throughout Europe and worldwide.

Technical assistance is available for bearing identification using manufacturer designations, dimensions and application requirements.