GRN FKM 250x290x16 AO/TC - Double Lip Viton

GRN FPM 250x290x16 AO/TC - Double Lip FKM Rotary Shaft Oil Seal

GRN FPM 250x290x16 AO/TC is a rotary shaft oil seal from the GRN brand, manufactured using FPM/FKM fluoroelastomer. Its nominal dimensions are 250 mm shaft diameter, 290 mm housing bore diameter, and 16 mm axial width. The product is identified as a double lip oil seal for rotating shaft applications. The TC profile conventionally incorporates a spring-loaded primary sealing lip, an auxiliary dust lip, and a rubber-covered metal case. The combined AO/TC designation should be verified against the actual GRN construction because these profile codes are not universally equivalent.

Technical Specifications - GRN FPM 250x290x16 AO/TC

The dimensions and designation above identify the requested GRN product. The exact cross-sectional construction, spring arrangement, case material, and detailed operating limits require confirmation from the manufacturer or inspection of the actual seal.

No unverified load ratings, maximum shaft speeds, pressure ratings, temperature limits, or manufacturer cross-reference numbers are assigned to this product.

What Does GRN FPM 250x290x16 AO/TC Mean?

The designation identifies the brand, material family, nominal dimensions, and the profile codes used in the product name.

• GRN - Product brand.

• FPM - Fluoroelastomer material designation.

• FKM - Alternative standardized designation for the fluoroelastomer family.

• 250 - Nominal shaft diameter in millimeters.

• 290 - Nominal housing bore diameter in millimeters.

• 16 - Nominal axial seal width in millimeters.

• AO/TC - Profile designations appearing in the product identification. Their exact equivalence must not be assumed.

The complete product designation should be retained when ordering a replacement.

AO and TC - Important Technical Distinction

The designations AO and TC may refer to different sealing profiles depending on the manufacturer's nomenclature.

TC commonly describes a radial shaft seal with:

• A spring-loaded primary sealing lip.

• An auxiliary dust exclusion lip.

• A metal reinforcing case with an elastomer-covered outside diameter.

AO is used differently in some European sealing profile systems. It must not automatically be interpreted as a direct equivalent of TC or as proof of a double lip, spring-loaded design.

Therefore, the combined designation AO/TC should be treated as a product identification reference rather than independent confirmation that both profile standards describe exactly the same construction.

For precise replacement selection, the actual seal cross-section and manufacturer's specifications take priority over a generic profile description.

Construction and Operating Principle

The GRN FPM 250x290x16 AO/TC is intended to provide radial sealing between a rotating shaft and a stationary housing.

Its main function is to limit lubricant leakage from the mechanical assembly while reducing contamination entering the sealing area.

Primary Sealing Lip

The primary sealing lip contacts the rotating shaft and provides the principal barrier against lubricant leakage.

In a conventional TC design, a garter spring supports the sealing lip by maintaining radial contact pressure.

The exact spring arrangement of this GRN execution should be confirmed before specifying it as a verified product feature.

Sealing effectiveness depends on shaft surface finish, lubrication, alignment, operating temperature, and shaft movement.

Auxiliary Dust Lip

A conventional double lip TC profile includes an auxiliary dust lip positioned toward the external environment.

This lip helps reduce the entry of dust, dirt, and other contaminants into the primary sealing area.

For the requested GRN product, the double lip configuration is part of the supplied product identification. The detailed lip geometry should be confirmed against the physical seal.

Outer Case Construction

Conventional TC seals feature a metal reinforcing case covered with elastomer on the outside diameter.

This construction helps provide a sealing interface between the seal and the housing bore.

However, the precise outer case construction of the GRN 250x290x16 execution should not be assumed solely from the combined AO/TC designation.

FPM, FKM and Viton - Material Identification

FPM and FKM are standardized designations for the fluoroelastomer material family used in many industrial sealing applications.

FPM and FKM identify the same general elastomer family.

Viton is a registered trade name, not a generic material standard.

An oil seal described as FKM or FPM is not automatically manufactured from a genuine Viton-branded compound.

For the GRN FPM 250x290x16 AO/TC, the material family is identified as FPM/FKM. The exact compound formulation and any proprietary material origin require manufacturer documentation.

Why Is FKM Used in Rotary Shaft Seals?

Suitable FKM compounds can provide:

• Resistance to many mineral oils and lubricating greases.

• Improved elevated-temperature capability compared with many conventional NBR compounds.

• Resistance to various industrial fluids.

• Material stability under appropriate chemical and thermal conditions.

These properties depend on the specific compound and operating environment.

FKM should not be described as universally resistant to all chemicals, fuels, solvents, or high-temperature conditions.

Compatibility must be checked for the actual medium, concentration, temperature, and exposure duration.

GRN FPM 250x290x16 vs NBR Oil Seal

FKM and NBR oil seals can share identical nominal dimensions while having different material characteristics.

A 250x290x16 NBR seal should not automatically replace a 250x290x16 FKM seal.

Before changing the material, verify the sealed medium, operating temperature, shaft speed, pressure, and the machine manufacturer's requirements.

GRN FPM 250x290x16 AO/TC and Other Seal Profiles

Several radial shaft seal profiles may share the same dimensions.

These are general profile descriptions, not confirmed GRN variants available in the size 250x290x16 mm.

Matching dimensions do not establish complete interchangeability between different seal profiles.

The outer case construction, lip geometry, spring arrangement, material, and installation requirements must also be considered.

Alternative Designations and Product References

The requested seal may be described using the following natural identification formats:

• GRN FPM 250x290x16 AO/TC

• FPM 250x290x16 AO/TC GRN

• GRN 250x290x16 FKM oil seal

• 250x290x16 FPM rotary shaft seal

• 250x290x16 double lip oil seal GRN

• GRN 250x290x16 fluorocarbon oil seal

These are descriptive search and identification variants, not independently confirmed manufacturer part numbers.

No OEM references or cross-reference numbers are included without verification.

Selecting the Correct 250x290x16 Rotary Shaft Seal

Before ordering, verify the following technical requirements:

• Nominal shaft diameter of 250 mm.

• Housing bore diameter of 290 mm.

• Available installation width of 16 mm.

• Exact sealing profile and lip arrangement.

• FPM/FKM elastomer material.

• Presence and position of any garter spring.

• Outer case construction.

• Shaft surface finish and wear condition.

• Shaft runout and eccentricity.

• Shaft and housing alignment.

• Operating temperature.

• Shaft rotational speed and peripheral speed.

• Type of lubricant or process medium.

• Pressure conditions.

• Environmental contamination.

• Original equipment specifications.

For a large-diameter seal with a 250 mm nominal shaft diameter, particular attention should be given to shaft runout, alignment, and the condition of the sealing contact surface.

Excessive shaft movement or an unsuitable surface finish may lead to accelerated lip wear or leakage.

Can a TC Seal Replace an AO Seal?

Not automatically.

Although both designations may appear in oil seal catalogs, their construction and meaning can differ.

Before substitution, compare the actual lip arrangement, spring design, outside diameter construction, material, dimensions, and operating requirements.

If the original equipment specifies a particular profile, that requirement should take priority over generic catalog equivalence.

Typical Applications of FKM Rotary Shaft Oil Seals

FKM radial shaft oil seals are commonly used in industrial rotating shaft assemblies where lubricant retention and appropriate material resistance are required.

Typical applications for this seal category include:

• Industrial gearboxes and speed reducers.

• Mechanical power transmission systems.

• Large bearing housings.

• Selected pump assemblies.

• Industrial processing machinery.

• Rotating shaft assemblies exposed to lubricants and environmental contaminants.

These are general applications of FKM rotary shaft seals.

They do not constitute verified OEM applications for the specific GRN 250x290x16 AO/TC product.

Suitability must be determined from the operating conditions and equipment requirements.

Installation and Operating Guidelines

Preparation

Before installation, inspect the shaft and housing bore.

Remove contamination and check for scratches, corrosion, excessive wear, or deformation.

The shaft contact surface should be suitable for radial shaft sealing.

Protect the sealing lips from sharp edges, threads, and keyways during installation.

Seal Orientation

For a conventional spring-loaded oil-retaining seal, the primary sealing lip normally faces the medium being retained.

An auxiliary dust lip, where present, generally faces the side exposed to contamination.

The final installation orientation must follow the actual seal construction and equipment manufacturer's instructions.

Installation Procedure

1. Confirm the seal dimensions and material.

2. Inspect the shaft and housing bore.

3. Protect the sealing lips from installation damage.

4. Apply a suitable lubricant to the contact area where required.

5. Press the seal evenly into the housing using an appropriate installation tool.

6. Avoid tilting or deforming the seal during installation.

7. Verify the correct installation depth and orientation.

8. Inspect for leakage and abnormal conditions after startup.

Do not apply installation forces directly to the sealing lips or spring.

Lubrication

The primary sealing lip generally requires an appropriate lubricating film during operation.

Insufficient lubrication can cause frictional heating and accelerated wear.

The lubricant must be compatible with the actual FKM compound and operating conditions.

Storage

Store the seal in a clean, dry location protected from sunlight, ozone sources, excessive heat, and mechanical deformation.

Avoid bending or compressing the sealing lips during storage.

Frequently Asked Questions - GRN FPM 250x290x16 AO/TC

1. What are the dimensions of the GRN FPM 250x290x16 oil seal?

The nominal shaft diameter is 250 mm, the housing bore diameter is 290 mm, and the seal width is 16 mm. The complete dimensions are 250x290x16 mm.

2. What type of seal is GRN FPM 250x290x16 AO/TC?

It is identified as a double lip rotary shaft oil seal manufactured from FPM/FKM fluoroelastomer. The exact construction associated with the combined AO/TC designation should be verified.

3. What does TC mean in an oil seal designation?

TC commonly identifies a radial shaft oil seal with a spring-loaded primary sealing lip, an auxiliary dust lip, and a rubber-covered metal case.

4. Are AO and TC identical oil seal profiles?

Not necessarily. Their meanings can differ depending on the manufacturer's nomenclature. They should not be considered automatically interchangeable.

5. Are FPM and FKM the same material?

Yes. Both designations refer to the general fluoroelastomer material family, although they originate from different terminology systems.

6. Is this GRN oil seal manufactured from genuine Viton?

The FPM/FKM designation alone does not confirm the use of a genuine Viton-branded compound. The exact material formulation requires manufacturer confirmation.

7. Can an NBR 250x290x16 seal replace this FKM seal?

Only after checking material compatibility and operating conditions. Identical dimensions do not guarantee that NBR will meet the original temperature, chemical resistance, or service requirements.

8. Is the GRN 250x290x16 FKM oil seal suitable for high temperatures?

FKM materials are commonly used in applications involving elevated temperatures. However, the exact permissible temperature range of this GRN seal cannot be specified without verified material and product data.

GRN FPM 250x290x16 AO/TC - Key Product Information

GRN FPM 250x290x16 AO/TC is a double lip rotary shaft oil seal identified by nominal dimensions of 250x290x16 mm and FPM/FKM fluoroelastomer material. It is intended for lubricant retention and contamination protection in rotating shaft assemblies. A conventional TC profile uses a spring-loaded primary lip and an auxiliary dust lip, but the exact GRN AO/TC construction should be confirmed before determining interchangeability.

The product is offered by simmering.pl, a specialist supplier of industrial seals, bearings, and technical components operated by TG Ersatzteile Polska Sp. z o.o.

The company maintains a warehouse in Lublin, Poland, serving industrial customers, maintenance departments, and technical purchasing teams. International and worldwide shipping options are available.