V-RING VA 55 NBR 53-58 mm - Axial Shaft Seal

V-RING VA 55 NBR 53-58 mm - Axial Rotary Shaft Seal

V-RING VA 55 NBR is an elastomeric axial shaft seal designed for shaft diameters of 53-58 mm. The standard VA profile has a nominal free-state inside diameter of 49 mm, a cross-section height of 5 mm and a free-state axial width of 9 mm. NBR identifies nitrile butadiene rubber. The seal rotates with the shaft while its flexible sealing lip contacts a stationary axial counterface, helping protect the mechanical assembly against external contamination.

Technical Specifications - V-RING VA 55 NBR

These dimensions correspond to the standard VA 55 profile geometry. The manufacturer of the specific product has not been identified. Exact dimensional tolerances and permissible operating conditions should be confirmed for the supplied seal.

What Does V-RING VA 55 NBR Mean?

V-RING - Axial Shaft Seal

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

Its body rotates with the shaft, while the flexible sealing lip contacts a stationary axial surface.

Unlike a conventional radial shaft oil seal, a V-ring does not seal through lip contact with the cylindrical shaft surface.

The seal helps restrict dust, moisture and other external contaminants from entering the protected mechanical assembly.

VA - Standard Sealing Profile

VA identifies the standard axial V-ring sealing profile.

The construction consists of a flexible elastomeric body and an integral sealing lip.

The VA profile is designed for direct installation onto the shaft.

It should not be confused with the VS profile, which has a different cross-sectional geometry and different installation space requirements.

55 - Nominal Seal Size

The number 55 identifies the nominal seal size.

The standard VA 55 V-ring is designed for shaft diameters of 53-58 mm.

The free-state inside diameter of the seal is 49 mm.

This means that the uninstalled seal has a smaller inside diameter than the shaft onto which it is fitted.

During installation, the elastomeric body stretches to grip the shaft.

NBR - Nitrile Butadiene Rubber

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

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

Actual chemical and temperature resistance depend on the specific elastomer compound.

Compatibility with the operating medium should be verified before use in chemically demanding environments.

Construction and Operating Principle of V-RING VA 55 NBR

Elastomeric Seal Body

The seal body is manufactured from nitrile butadiene rubber.

Its nominal free-state inside diameter is 49 mm.

During installation onto a shaft with a diameter of 53-58 mm, the elastomer stretches.

The resulting elastic tension helps retain the seal on the shaft.

Integral Sealing Lip

The sealing lip is an integral part of the seal body.

When correctly installed, it contacts a stationary axial counterface.

This contact helps restrict the entry of contaminants into the protected area.

Axial Sealing Principle

V-RING VA 55 NBR provides sealing through axial contact.

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

It is not a radial shaft seal in which the lip contacts the cylindrical shaft surface.

Rotation with the Shaft

The seal body rotates together with the shaft.

The sealing lip contacts a stationary component, such as the axial face of a bearing housing, cover or another appropriately prepared mechanical surface.

Correct axial positioning is important for effective sealing.

Deflector Action

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

This action supplements the contact sealing function.

However, a standard V-ring should not be considered a universal pressure seal.

Dimensions and Selection of V-RING VA 55 NBR

The actual shaft diameter is the primary selection parameter.

Does V-RING VA 55 NBR Fit a 55 mm Shaft?

Yes.

A shaft diameter of 55 mm falls within the standard mounting range of 53-58 mm.

The available axial installation space, counterface geometry and operating conditions must also be checked.

Why Is the Inside Diameter Only 49 mm?

A V-ring is an elastic sealing component.

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

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

This allows the seal to grip the shaft and rotate with it.

Therefore, VA 55 should not be selected as if it were a rigid ring with a 55 mm bore.

What Is the Recommended Installed Width?

The recommended installed axial width is 7 +/- 1 mm.

This dimension is important for achieving correct contact between the sealing lip and the stationary axial counterface.

Incorrect axial compression may increase friction, accelerate wear or reduce sealing effectiveness.

What Counterface Dimensions Are Required?

For the standard VA 55 profile, the following dimensional relationships apply:

• Maximum counterface inside diameter: shaft diameter + 2 mm.

• Minimum counterface outside diameter: shaft diameter + 15 mm.

For a shaft diameter of 55 mm, this corresponds to:

• Maximum counterface inside diameter: 57 mm.

• Minimum counterface outside diameter: 70 mm.

The counterface should be appropriately prepared, clean and free from damage.

V-RING VA 55 NBR vs Other Variants

VA 55 vs VA 50

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

VA 55 covers the range of 53-58 mm.

Both seals belong to the same design family, but their free-state inside diameters differ.

They should not be considered automatically interchangeable.

VA 55 vs VA 60

The standard VA 60 is designed for shaft diameters of 58-63 mm.

VA 55 covers the range of 53-58 mm.

When selecting a seal at the boundary of these mounting ranges, the manufacturer's recommendations should be considered.

VA 55 vs VS 55

Both seals belong to the axial V-ring family.

The VS profile has a different cross-sectional geometry and requires more axial installation space.

An identical shaft diameter range does not guarantee complete interchangeability between the two profiles.

VA 55 NBR vs VA 55 FKM

NBR and FKM are different elastomeric materials.

NBR is commonly used in standard industrial applications involving compatible mineral oils and greases.

FKM may be suitable for selected applications requiring different chemical or temperature resistance.

Material substitution requires confirmation of dimensional compatibility and operating conditions.

Alternative Designations and Search References

The product may be encountered under the following written forms:

• V-RING VA 55 NBR

• V-ring VA 55

• VA 55 NBR

• VA55 NBR

• V-RING VA55

• V-ring type A 55

• VA 55 axial shaft seal

• V-ring 55 NBR seal ring

These are natural written variations and descriptive references.

Manufacturer catalogues may also contain designations such as 55 VA R and V-55A. Compatibility with the supplied product must be verified by comparing the material, dimensions and manufacturer's specifications.

Typical Applications of V-RING VA 55 NBR

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

Typical applications based on the seal construction include:

• Protection of rolling bearings against dust and moisture.

• Additional sealing of bearing housings.

• Industrial rotating shafts.

• Mechanical drive assemblies.

• Rotating machinery components.

• Equipment operating in dusty environments.

• Assemblies exposed to water and grease splashes.

These are typical applications of the V-ring sealing design, not confirmed installations of this specific product in particular 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 sealing components within the assembly.

Dust Protection

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

Its effectiveness depends on correct installation and the condition of the counterface.

Moisture Protection

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

It should not be treated as a universal pressure seal.

Selection and Interchangeability of V-RING VA 55 NBR

Before ordering, verify:

1. Complete designation V-RING VA 55 NBR.

2. VA sealing profile.

3. Shaft diameter within 53-58 mm.

4. NBR elastomer material.

5. Free-state inside diameter of 49 mm.

6. Cross-section height of 5 mm.

7. Free-state axial width of 9 mm.

8. Recommended installed axial width of 7 +/- 1 mm.

9. Available installation space.

10. Counterface dimensions and surface condition.

11. Shaft rotational speed.

12. Operating temperature.

13. Chemical compatibility between NBR and the operating medium.

14. Type of external contamination.

15. Requirements of the complete sealing arrangement.

Are VA 55 V-Rings from Different Manufacturers Interchangeable?

Not always.

Profile geometry, dimensional tolerances, elastomer materials and installation requirements must be compared.

An identical nominal designation does not guarantee complete technical compatibility.

Can VA 55 Replace a Conventional Radial Shaft Oil Seal?

Not automatically.

A V-ring provides axial sealing, while a conventional radial shaft oil seal provides radial sealing.

The two designs have different operating principles and installation requirements.

A V-ring often provides additional protection against contamination rather than serving as a direct replacement for a primary radial shaft oil seal.

Installation and Operation of V-RING VA 55 NBR

Shaft Preparation

Clean the shaft thoroughly before installation.

Remove burrs, sharp edges and contaminants 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 damaging the flexible sealing lip.

Axial Positioning

The sealing lip must face the stationary axial counterface.

Maintain the recommended installed axial width.

Counterface Condition

The stationary axial counterface should be clean, appropriately prepared and free from damage.

Incorrect geometry may accelerate sealing lip wear.

Operating Conditions

Before starting the machine, verify rotational speed, operating temperature and compatibility between NBR and the operating medium.

Permissible operating conditions depend on the specific elastomer compound and the complete sealing arrangement.

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 VA 55 NBR

What Shaft Diameter Is V-RING VA 55 NBR Designed For?

The standard VA 55 V-ring is designed for shaft diameters of 53-58 mm.

What Are the Dimensions of V-RING VA 55 NBR?

The free-state inside diameter is 49 mm, the cross-section height is 5 mm, and the free-state axial width is 9 mm. The recommended installed axial width is 7 +/- 1 mm.

What Does VA Mean in a V-Ring Designation?

VA identifies the standard axial V-ring profile with a flexible sealing lip that contacts a stationary axial counterface.

What Does NBR Mean?

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

Does V-RING VA 55 NBR Rotate with the Shaft?

Yes. The seal body rotates with the shaft, while its flexible sealing lip contacts a stationary axial counterface.

Does VA 55 Fit a 55 mm Shaft?

Yes. A 55 mm shaft falls within the standard mounting range of 53-58 mm. The available axial installation space and counterface dimensions must also be checked.

Can a VA 55 V-Ring Replace a Conventional Oil Seal?

Not automatically. A V-ring provides axial sealing, whereas a conventional radial shaft oil seal provides radial sealing. The designs have different installation requirements and may perform different functions.

Can VA 55 NBR Be Replaced with VA 55 FKM?

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

V-RING VA 55 NBR - Quick Technical Overview

V-RING VA 55 NBR is an elastomeric axial shaft seal designed for shaft diameters of 53-58 mm. The standard VA profile has a 49 mm free-state inside diameter, a 5 mm cross-section height and a 9 mm free-state axial width. Manufactured from nitrile butadiene rubber, the seal rotates with the shaft while its flexible lip helps restrict external contamination.

V-RING VA 55 NBR at simmering.pl

V-RING VA 55 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.