GRN 27x43x7 NBR AO/TC Rotary Shaft Seal - Double-Lip Oil Seal

GRN 27x43x7 NBR AO/TC Rotary Shaft Seal - Double-Lip Oil Seal

GRN 27x43x7 NBR AO/TC is a double-lip rotary shaft seal with a 27 mm inside diameter, 43 mm outside diameter and 7 mm width. Manufactured with an NBR (Nitrile Butadiene Rubber) sealing element, it features a spring-loaded primary sealing lip, an additional dust lip and a rubber-covered metal-reinforced outer case. The seal is designed for suitable rotating shaft assemblies requiring lubricant retention and additional protection against external contamination.

Product Characteristics

The GRN 27x43x7 NBR AO/TC radial shaft seal is designed to seal the interface between a rotating shaft and a stationary housing.

Its primary function is to help prevent lubricant leakage from the assembly. The additional dust lip helps reduce the entry of external contaminants into the main sealing area.

Key construction features:

• Double-lip sealing design.

• Spring-loaded primary sealing lip.

• Additional dust protection lip.

• NBR sealing material.

• Metal-reinforced construction.

• Rubber-covered outside diameter.

• Nominal dimensions of 27x43x7 mm.

Technical Specifications

The exact operating temperature range, maximum shaft speed, permissible pressure and elastomer hardness require confirmation from the product-specific technical documentation.

What Does 27x43x7 NBR AO/TC Mean?

The product designation identifies the dimensions, sealing material and construction.

• 27 mm - nominal shaft diameter.

• 43 mm - nominal housing bore diameter.

• 7 mm - nominal seal width.

• NBR - Nitrile Butadiene Rubber.

• AO/TC - a commonly used double-lip oil seal profile with an additional dust lip and rubber-covered outer case.

• GRN - product brand.

AO and TC are widely used profile designations, but their exact interpretation can vary between manufacturers. The actual construction should always be checked when selecting an equivalent seal.

AO/TC Double-Lip Construction

Spring-Loaded Primary Sealing Lip

The primary sealing lip contacts the rotating shaft and performs the main sealing function.

A garter spring helps maintain contact pressure between the sealing lip and shaft surface during operation.

Additional Dust Lip

The secondary lip provides additional protection against external contaminants, including:

• Dust.

• Dirt.

• Fine mechanical particles.

The dust lip does not automatically make the seal suitable for pressurized water or every heavily contaminated operating environment.

Rubber-Covered Outer Case

The internal metal reinforcement provides structural rigidity, while the elastomer-covered outside diameter forms the sealing interface with the housing bore.

Correct housing dimensions, surface condition and installation are important for reliable sealing performance.

NBR Sealing Material

NBR is a widely used elastomer in industrial rotary shaft seals.

Typical characteristics include:

• Good resistance to many mineral oils.

• Compatibility with many mineral-based greases.

• Good mechanical properties for conventional sealing applications.

• Suitability for various industrial lubrication systems.

Chemical compatibility depends on the specific NBR compound, operating temperature and sealing medium.

NBR is not universally resistant to all fuels, solvents or industrial chemicals.

A specific operating temperature range should not be assigned without verified manufacturer data.

Typical Applications

AO/TC double-lip rotary shaft seals are commonly used in appropriately designed:

• Mechanical gearboxes.

• Gear reducers.

• Drive mechanisms.

• Industrial machinery.

• Agricultural equipment.

• Oil-lubricated rotating shaft assemblies.

These are general applications for this type of seal, not confirmed equipment-specific applications of the GRN 27x43x7 product.

AO/TC vs Single-Lip Oil Seals

A single-lip 27x43x7 oil seal is not automatically interchangeable with a double-lip AO/TC version.

How to Select the Correct 27x43x7 Oil Seal

Before ordering, verify:

1. Shaft diameter - 27 mm.

2. Housing bore diameter - 43 mm.

3. Seal width - 7 mm.

4. Sealing material - NBR.

5. Double-lip AO/TC construction.

6. Presence of the garter spring.

7. Rubber-covered outer case.

8. Required installation orientation.

9. Compatibility with the sealing medium.

10. Shaft condition and operating requirements.

Identical dimensions do not guarantee interchangeability.

When replacing an existing oil seal, confirm the profile, material and equipment manufacturer's specifications.

Installation Guidelines

Before installation, clean the housing bore and inspect the shaft surface.

Check for:

• Shaft wear grooves.

• Scratches and corrosion.

• Sharp edges.

• Contamination.

• Excessive shaft runout.

• Bearing play.

Install the seal squarely using a suitable installation tool. Apply installation force evenly without deforming the outer case.

Protect the sealing lips when passing the seal over shaft shoulders, keyways or sharp edges.

In conventional oil-retention applications, the spring-loaded primary sealing lip normally faces the lubricant. Always follow the equipment manufacturer's installation instructions.

Frequently Asked Questions

What are the dimensions of the GRN AO/TC oil seal?

The nominal dimensions are 27x43x7 mm: 27 mm inside diameter, 43 mm outside diameter and 7 mm width.

Is the GRN 27x43x7 oil seal double-lipped?

Yes. The AO/TC construction features a primary sealing lip and an additional dust lip.

Does this rotary shaft seal have a garter spring?

Yes. The primary sealing lip is spring-loaded.

What material is used?

The sealing element is made from NBR, or Nitrile Butadiene Rubber.

Is NBR suitable for oil sealing?

NBR is commonly used with many mineral oils and greases. Compatibility with the specific lubricant and operating conditions must be verified.

Can a single-lip seal replace the AO/TC version?

Not automatically. A single-lip seal does not provide the same construction or additional dust lip.

Can an FKM seal replace this NBR oil seal?

Only after confirming dimensional, material and construction compatibility with the equipment requirements.

Which direction should the oil seal face?

In conventional oil-retention applications, the spring-loaded primary lip normally faces the lubricant. Equipment-specific installation instructions take priority.

Does this seal fit a particular machine model?

Compatibility must be confirmed using the original part number, seal dimensions, profile, material and equipment documentation. Dimensions alone do not confirm fitment.

GRN 27x43x7 NBR AO/TC - Key Technical Information

GRN 27x43x7 NBR AO/TC is a double-lip rotary shaft seal with a 27 mm inside diameter, 43 mm outside diameter and 7 mm width. It features an NBR sealing element, spring-loaded primary lip, additional dust lip and rubber-covered metal-reinforced case. It is intended for appropriately designed rotating shaft sealing applications.

GRN Rotary Shaft Seals at simmering.pl

simmering.pl supplies GRN rotary shaft seals, NBR and FKM oil seals, cassette seals, O-rings and industrial bearings.

Our warehouse is located in Lublin, Poland. We supply individual customers and B2B buyers, with shipping within Poland, across Europe and internationally.