V-RING VS 50 NBR 48-53 - Axial Shaft Seal

V-RING VS 50 NBR - Axial Shaft Seal for 48-53 mm Shafts

V-RING VS 50 NBR is an elastomeric axial shaft seal with a VS profile, designed for shaft diameters of 48-53 mm. Manufactured from nitrile butadiene rubber (NBR), it features a flexible sealing lip that operates against a stationary axial counterface. Compared with the VA profile, the VS design has a wider cross-section and requires more installation space. The seal rotates with the shaft and helps protect mechanical assemblies against external contamination.

Technical Specifications - V-RING VS 50 NBR

The dimensions refer to the standard VS 50 profile. Final dimensional tolerances and permissible operating conditions must be confirmed for the manufacturer and elastomer compound of the specific product.

What Does V-RING VS 50 NBR Mean?

V-RING - Seal Type

A V-ring is a flexible elastomeric sealing ring installed directly onto a rotating shaft.

Its sealing lip operates axially against a surface perpendicular to the shaft axis.

The seal body remains mounted on the shaft and rotates together with it.

This construction differs from a conventional radial shaft oil seal, whose sealing lip operates directly against the cylindrical surface of the shaft.

VS - Sealing Profile

VS identifies a V-ring design with a wider axial cross-section than the standard VA profile of the same nominal size.

For VS 50, the nominal free-state axial width is 13 mm.

The wider profile must be considered when determining the available installation space within the mechanical assembly.

VA and VS profiles should not be treated as automatically interchangeable.

50 - Nominal Seal Size

The number 50 identifies the nominal seal size.

The standard VS 50 V-ring is designed for shaft diameters of 48-53 mm.

The designation 50 does not represent the actual inside diameter of the uninstalled seal.

The free-state inside diameter is 45 mm.

This difference allows the elastomeric body to stretch and grip the shaft during installation.

NBR - Nitrile Butadiene Rubber

NBR is a synthetic elastomer commonly used in industrial sealing applications.

It provides flexibility and resistance to many mineral oils and greases.

Actual chemical and temperature resistance depends on the specific rubber compound and operating conditions.

Construction and Operating Principle of V-RING VS 50 NBR

Flexible Elastomeric Body

The seal body is manufactured from NBR rubber.

Its free-state inside diameter is smaller than the intended shaft diameter.

During installation, the elastomer stretches to fit the shaft.

The resulting elastic tension helps retain the seal in position.

Axial Sealing Lip

The flexible sealing lip is responsible for the primary sealing function.

When correctly installed, it contacts a stationary axial counterface.

This contact helps prevent dust, moisture and other contaminants from entering the protected mechanical assembly.

Axial Sealing Action

The sealing lip operates against a surface perpendicular to the shaft axis.

It does not provide radial sealing in the same manner as a conventional rotary shaft oil seal.

Consequently, its installation method and counterface requirements differ from those of a standard radial shaft seal.

Rotation with the Shaft

The VS 50 V-ring is installed directly onto the shaft.

During operation, it rotates with the shaft while the sealing lip contacts a stationary surface, such as a bearing housing face, cover or another suitable mechanical component.

Additional Deflector Action

During rotation, the V-ring can also help deflect water and contaminants away from the sealing area.

This effect supplements the contact sealing function.

Installation Dimensions - V-RING VS 50

The shaft diameter is the primary selection parameter.

The standard VS 50 profile is designed for shaft diameters of 48-53 mm.

Why Is the Free-State Inside Diameter 45 mm?

A V-ring is an elastic sealing component.

Before installation, its inside diameter is smaller than the shaft diameter.

During installation, the seal body stretches and conforms to the shaft surface.

Therefore, V-RING VS 50 NBR must not be selected as if it were a rigid ring with a 50 mm bore.

Does VS 50 Fit a 50 mm Shaft?

Yes.

A 50 mm shaft falls within the nominal mounting range of 48-53 mm.

The available installation space and counterface geometry must also be verified.

How Much Installation Space Is Required?

The nominal free-state axial width is 13 mm.

The recommended installed axial width is 11 +/- 1 mm.

The design must also provide the required counterface dimensions and mounting clearances.

V-RING VS 50 NBR vs Other Variants

VS 50 vs VA 50

Both seals are designed for shaft diameters of 48-53 mm.

However, their cross-sectional geometries differ.

The VS 50 profile requires more axial installation space than VA 50.

Therefore, identical shaft diameter ranges do not establish complete interchangeability.

VS 50 NBR vs VS 50 FKM

These variants differ in elastomer material.

NBR is commonly used in standard industrial sealing applications.

FKM may be suitable for certain applications involving elevated temperatures or specific chemical media.

Before substitution, material compatibility and operating conditions must be checked.

VS 50 vs VS 45

VS 45 is intended for smaller shaft diameters.

VS 50 covers the 48-53 mm shaft diameter range.

Selection must be based on the actual shaft diameter and the manufacturer's recommendations.

Alternative Designations and Search References

The product may be encountered under the following written forms:

• V-RING VS 50 NBR

• V-ring VS 50

• VS 50 NBR

• VS50 NBR

• V-RING VS50

• V-ring type VS 50

• VS 50 axial shaft seal

Some industrial catalogues also use the designation S for V-ring profiles with a corresponding design.

However, this does not establish automatic interchangeability between products from different manufacturers.

Typical Applications of V-RING VS 50 NBR

VS-type V-rings are used in mechanical assemblies requiring protection against external contamination.

Typical applications based on the seal design include:

• Protection of rolling bearings.

• Additional sealing of bearing housings.

• Industrial rotating shafts.

• Mechanical drive assemblies.

• Rotating machinery components.

• Machinery operating in dusty environments.

• Equipment exposed to water and grease splashes.

These are general applications associated with V-ring construction, not confirmed installations of this particular product in specific machine models.

Rolling Bearing Protection

A V-ring can provide an additional barrier against contaminants entering the bearing area.

It may operate together with other components of the sealing system.

Dusty Operating Environments

The flexible sealing lip helps restrict the entry of dust and fine contaminants.

Sealing performance depends on correct installation and the condition of the axial counterface.

Moisture Protection

A V-ring can help reduce the ingress of moisture and water splashes.

However, a standard V-ring should not be considered suitable for arbitrary liquid pressure conditions.

Selection and Interchangeability of V-RING VS 50 NBR

Before ordering, verify:

1. Complete designation V-RING VS 50 NBR.

2. VS sealing profile.

3. Shaft diameter of 48-53 mm.

4. NBR elastomer material.

5. Free-state inside diameter.

6. Profile width.

7. Required axial installation space.

8. Counterface geometry.

9. Shaft rotational speed.

10. Operating temperature.

11. Type of medium and contaminants.

12. Protection requirements of the mechanical assembly.

Are VS 50 V-Rings from Different Manufacturers Interchangeable?

Not always.

The profile geometry, installation dimensions, elastomer material and counterface requirements must be compared.

An identical nominal size does not automatically guarantee compatibility.

Installation and Operation of V-RING VS 50 NBR

Shaft Preparation

Clean the shaft before installation and remove any sharp edges.

The mounting surface should be free from burrs that could damage the elastomer.

Installing the Seal

Stretch the V-ring evenly and slide it onto the shaft.

Avoid twisting the seal body or excessively deforming the sealing lip.

Axial Positioning

The sealing lip must face the stationary axial counterface.

The seal should be positioned according to the required installed axial width.

Counterface Condition

The stationary counterface should be clean and free from damage.

Incorrect geometry or sharp edges can accelerate sealing lip wear.

Operating Conditions

Before starting the machine, verify rotational speed, temperature and material compatibility with the operating medium.

Permissible operating speed depends on the seal design, material and installation conditions.

Storage

Store the seal in a clean, dry environment, protected from direct sunlight, excessive heat and substances that may damage the elastomer.

Frequently Asked Questions - V-RING VS 50 NBR

What Shaft Diameter Is V-RING VS 50 NBR Designed For?

The seal is designed for shaft diameters of 48-53 mm.

Does VS 50 Mean an Inside Diameter of 50 mm?

No. The number 50 identifies the nominal size. The free-state inside diameter of the seal is 45 mm.

What Does VS Mean in a V-Ring Designation?

VS identifies an axial V-ring sealing profile with a wider cross-section than the standard VA profile of the same nominal size.

What Does NBR Mean?

NBR stands for nitrile butadiene rubber, an elastomer used in industrial seals because of its flexibility and resistance to many mineral oils and greases.

Does V-RING VS 50 NBR Rotate with the Shaft?

Yes. The seal body is mounted on the shaft and rotates with it, while the flexible sealing lip contacts a stationary axial counterface.

What Is the Difference Between VS 50 and VA 50?

Both profiles are designed for shafts measuring 48-53 mm, but VS 50 has a greater axial width. The nominal free-state width of VS 50 is 13 mm, compared with 9 mm for VA 50.

Can VS 50 NBR Be Replaced with VS 50 FKM?

Only after verifying dimensional compatibility and operating conditions. NBR and FKM differ in their chemical and temperature resistance characteristics.

Can a VS 50 V-Ring Replace a Conventional Radial Shaft Oil Seal?

Not necessarily. A V-ring provides axial sealing, while a conventional radial shaft oil seal provides radial sealing. Their construction and operating principles differ, and they may perform different functions within a sealing system.

V-RING VS 50 NBR - Quick Technical Overview

V-RING VS 50 NBR is an elastomeric axial shaft seal designed for shaft diameters of 48-53 mm. It features a VS profile with a nominal free-state axial width of 13 mm and is manufactured from nitrile butadiene rubber. The seal rotates with the shaft, while its flexible lip contacts a stationary axial surface to help protect mechanical assemblies against moisture and contamination.

V-RING VS 50 NBR at simmering.pl

V-RING VS 50 NBR is available to order from simmering.pl, a specialist supplier of industrial seals, V-rings, rotary shaft oil seals, O-rings and rolling bearings.

We serve manufacturing companies, maintenance departments, machinery service providers and B2B customers.

Our warehouse and order processing operations are located in Lublin, Poland.

We supply customers throughout Europe and offer worldwide shipping.

We assist customers in identifying industrial seals by profile, dimensions, material and operating requirements.