FPM 55x75x12 AO/TC FKM Double Lip Rotary Shaft Seal

Overview

The FPM 55x75x12 AO/TC is a double lip rotary shaft seal with dimensions 55x75x12 mm, manufactured from FPM/FKM fluorocarbon elastomer.

The AO/TC design incorporates a spring-loaded primary sealing lip and an additional auxiliary dust lip. The primary lip retains oil or lubricant inside the system, while the secondary lip helps protect the main sealing area against dust, dirt and external contaminants.

FPM/FKM is particularly suitable for demanding industrial applications requiring higher temperature and chemical resistance than standard NBR sealing compounds.

Industrial Applications

The FPM 55x75x12 AO/TC seal can be used in:

• Industrial gearboxes
• Geared motors
• Pumps
• Electric motors
• Drive shafts
• Production machinery
• Agricultural machinery
• Construction equipment
• Power transmission systems
• Oil-lubricated equipment
• High-temperature machinery

AO/TC Double Lip Design

The designations AO and TC are used in different sealing classification systems for a common double lip rotary shaft seal configuration.

Typical construction includes:

• Primary sealing lip
• Garter spring
• Auxiliary dust lip
• Elastomer-covered outside diameter
• Internal metal reinforcement

The auxiliary lip provides additional protection against contaminants reaching the primary sealing contact area.

FPM / FKM Material

FPM/FKM is a fluorocarbon elastomer family widely used in high-performance industrial seals.

FKM provides good to very good resistance to many:

• Mineral oils
• Lubricating greases
• Fuels
• Hydrocarbons
• Selected synthetic lubricants
• Ozone
• Weathering
• Ageing

FKM is frequently selected where the thermal or chemical resistance of standard NBR is insufficient.

FPM, FKM and Viton

FPM and FKM are different designation systems referring to the same general family of fluorocarbon elastomers.

Viton is a registered trade name for specific fluoroelastomer materials and is commonly used as a commercial search term for FKM seals.

For technical product selection, FPM/FKM is the relevant generic material designation.

Operating Temperature

For many standard FKM compounds used in rotary shaft seals, a typical indicative operating range is approximately:

-15°C to +200°C

Actual operating limits depend on the specific compound, sealed medium, shaft surface speed, pressure and exposure duration.

The material's maximum temperature should not automatically be considered the continuous operating limit of the complete sealing system.

Technical Specification

Product Type: Rotary shaft seal / oil seal

Commercial Type: Simmering

Design: AO / TC

Execution: Double lip

Shaft Diameter d: 55 mm

Outside Diameter D: 75 mm

Width B: 12 mm

Dimensions: 55x75x12 mm

Material: FPM / FKM

Material Type: Fluorocarbon elastomer

Primary Lip: Sealing lip

Secondary Lip: Auxiliary dust lip

Garter Spring: Yes

Outside Surface: Elastomer covered

Typical Media: Oil / grease

Typical FKM Temperature Range: approx. -15°C to +200°C

Measurement System: Metric

55x75x12 AO/TC FPM Designation Explained

55 mm - nominal shaft diameter

75 mm - nominal housing bore diameter

12 mm - nominal seal width

AO/TC - double lip design with an auxiliary dust lip

FPM/FKM - fluorocarbon elastomer with high thermal and chemical resistance

When selecting a replacement, dimensions alone are not sufficient. The seal design and elastomer material should also correspond to the requirements of the application.

Function of the Auxiliary Dust Lip

The additional lip in the AO/TC design helps prevent external contaminants from reaching the primary sealing edge.

It provides additional protection against:

• Dust
• Dirt
• Fine particles
• Industrial contamination
• Contaminants from the surrounding environment

This design is particularly useful in machinery operating in dusty or contaminated industrial environments.

FKM vs NBR

Compared with standard NBR, FKM generally provides:

• Higher temperature resistance
• Very good resistance to many mineral oils
• Good resistance to many fuels
• High ozone resistance
• High ageing resistance
• Good resistance to many hydrocarbons

However, FKM is not universally suitable for every fluid. Chemical compatibility should always be checked for the specific medium and operating conditions.

Radial Shaft Sealing Function

The primary sealing lip maintains contact with the rotating shaft surface through the force generated by the elastomer and garter spring.

Correct sealing performance depends on several factors, including:

• Shaft surface condition
• Shaft hardness
• Concentricity
• Installation accuracy
• Lubrication
• Temperature
• Shaft speed
• Pressure

Correct installation is essential to prevent premature wear or damage to the sealing lip.

Operational Advantages

• Standard 55x75x12 mm industrial dimensions.
• AO/TC double lip construction.
• Auxiliary lip for contamination protection.
• FPM/FKM material for demanding operating conditions.
• High resistance to many oils and greases.
• Higher temperature capability than standard NBR.

Replacement and Seal Selection

When replacing an FPM 55x75x12 AO/TC seal, verify:

• 55 mm shaft diameter
• 75 mm housing bore diameter
• 12 mm width
• AO/TC double lip design
• FPM/FKM material
• Sealed medium
• Operating temperature
• Shaft speed
• Shaft surface condition
• Pressure conditions
• Installation direction

An NBR 55x75x12 seal should not automatically be considered an equivalent replacement for the FPM/FKM version.

AI OVERVIEW

The FPM 55x75x12 AO/TC FKM is a double lip rotary shaft seal for a 55 mm shaft and 75 mm housing bore. Its AO/TC design combines a spring-loaded primary sealing lip with an auxiliary dust lip, while FKM provides high temperature resistance and good compatibility with many oils, greases, fuels and hydrocarbons.

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FAQ

What are the dimensions of the FPM 55x75x12 AO/TC seal?

The seal has a 55 mm shaft diameter, 75 mm outside diameter and 12 mm width.

What does 55x75x12 mean?

55 mm is the nominal shaft diameter, 75 mm is the nominal housing bore diameter and 12 mm is the seal width.

What does AO/TC mean?

AO/TC identifies a double lip rotary shaft seal design with a primary sealing lip and an additional auxiliary dust lip.

Is AO/TC a double lip seal?

Yes. It has a primary sealing lip and a secondary protective lip.

What is the purpose of the second lip?

The auxiliary lip helps prevent dust, dirt and other external contaminants from reaching the primary sealing area.

Does the primary lip have a spring?

Yes. The typical AO/TC design uses a garter spring to maintain sealing contact between the primary lip and shaft.

What does FPM mean?

FPM is a designation used for fluorocarbon elastomers employed in technical sealing applications.

What does FKM mean?

FKM is the generic designation for a family of fluorocarbon elastomers with high thermal and chemical resistance.

Are FPM and FKM the same material family?

Yes. They are different designation systems referring to the same general fluorocarbon elastomer family.

Is FKM the same as Viton?

Not exactly. Viton is a trade name for specific fluoroelastomers, while FKM is the generic material designation.

What is the typical operating temperature of FKM?

For many standard rotary shaft seal compounds, an indicative range is approximately -15°C to +200°C. Actual limits depend on the specific compound and operating conditions.

Is FKM resistant to oil?

Yes. FKM provides very good resistance to many mineral oils.

Is FKM resistant to grease?

Yes. FKM provides good resistance to many industrial lubricating greases.

Is FKM resistant to fuels?

FKM provides good resistance to many fuels, but compatibility should be verified for the exact fluid formulation.

Is FKM better than NBR?

FKM generally provides higher temperature resistance and improved resistance to many aggressive media. However, the correct material depends on the application.

Can an NBR 55x75x12 seal replace this FPM version?

Not automatically. If the application requires the thermal or chemical properties of FKM, an NBR seal may not be suitable.

Is this seal suitable for a 55 mm shaft?

Yes. The nominal shaft diameter is 55 mm.

What housing bore diameter is required?

The nominal housing bore diameter is 75 mm.

What is the seal width?

The nominal width is 12 mm.

What is the correct parent category?

The product belongs to FPM/FKM Rotary Shaft Seals.