Rotary Shaft Seal 50x72x7 FPM/FKM AO/TC Double Lip Oil Seal

Rotary Shaft Seal 50x72x7 FPM/FKM AO/TC

50x72x7 FPM/FKM AO/TC is a double lip radial shaft oil seal manufactured from fluoroelastomer.

Product type: Radial shaft oil seal

Dimensions: 50x72x7 mm

Material: FPM/FKM - Fluoroelastomer

Design: AO/TC

Construction: Double lip

Shaft diameter d: 50 mm

Outside diameter D: 72 mm

Width B: 7 mm

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

The complete technical identification combines the 50x72x7 mm dimensions, FPM/FKM material and AO/TC double lip construction.

50x72x7 Oil Seal Dimensions

The principal dimensions are:

Inside diameter d: 50 mm

Outside diameter D: 72 mm

Width B: 7 mm

Complete dimensions: 50x72x7 mm

All three dimensions should be verified when selecting a corresponding replacement.

Matching the 50 mm shaft diameter, 72 mm outside diameter and 7 mm width alone does not establish complete technical interchangeability.

FPM/FKM 50x72x7 Fluoroelastomer Oil Seal

The sealing material is:

Material: FPM/FKM - Fluoroelastomer

FPM and FKM are technical designations associated with fluoroelastomer sealing materials.

Fluoroelastomer radial shaft seals are commonly selected where the application requires material properties different from standard NBR, including applications involving elevated temperatures or particular oils, fuels and chemical media.

Exact compatibility depends on the specific medium, temperature and actual operating conditions.

FPM vs FKM Oil Seal

The terms FPM and FKM are commonly encountered when identifying fluoroelastomer seals.

Material group: Fluoroelastomer

Common designation: FKM

Alternative designation: FPM

For product identification and search, both terms are useful, particularly when cross-referencing European and international technical catalogues.

The exact compound specification should always be verified where material compatibility is critical.

Is FKM the Same as Viton?

Viton® is a trademark for specific fluoroelastomer materials, while FKM is a generic material-family designation.

For this reason, an FKM or FPM oil seal should not automatically be described as being manufactured from genuine Viton unless the specific compound or manufacturer confirms it.

The product can nevertheless be found by users searching for terms such as Viton oil seal 50x72x7, which is commonly used as a search expression for fluoroelastomer seals.

The technically appropriate material identification for this product is:

Material: FPM/FKM - Fluoroelastomer

AO/TC Double Lip Oil Seal Design

The seal construction is:

Design: AO/TC

Construction: Double lip

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

The primary sealing lip works against the rotating shaft and provides the principal sealing function.

The additional lip creates a secondary barrier on the external side of the primary sealing interface.

This construction distinguishes the product from a standard single lip radial shaft oil seal.

Spring-Loaded Primary Sealing Lip

The primary working lip is:

Primary sealing lip: Spring-loaded

Nominal shaft diameter: 50 mm

The garter spring helps maintain contact between the sealing edge and the shaft surface.

When comparing replacement seals, the primary lip configuration should therefore be considered together with dimensions and sealing material.

Additional Dust Lip

The 50x72x7 AO/TC oil seal incorporates:

Additional dust lip: Yes

The additional lip provides a barrier on the external side of the main sealing area and helps restrict contaminants from reaching the primary sealing interface.

A single lip 50x72x7 oil seal should therefore not automatically be considered constructionally equivalent to this double lip version.

50x72x7 FKM Double Lip Oil Seal

The complete product identification is:

Dimensions: 50x72x7 mm

Material: FPM/FKM

Design: AO/TC

Construction: Double lip

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

Using the complete identification is more precise than searching only for a "50x72x7 oil seal", because the same nominal dimensions can be available in different materials and lip configurations.

50x72x7 FKM Oil Seal vs NBR Oil Seal

An FPM/FKM 50x72x7 oil seal and an NBR 50x72x7 oil seal may have identical nominal dimensions but are manufactured from different elastomers.

This product:

Material: FPM/FKM

Alternative version: NBR

Dimensions: 50x72x7 mm

FPM/FKM and NBR should not be considered materially identical.

The correct material should be selected according to the medium, temperature and actual operating requirements of the sealing position.

50x72x7 AO/TC vs Single Lip Oil Seal

The principal difference is the lip configuration.

AO/TC: Double lip

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

A standard single lip oil seal does not have the same two-lip configuration.

Therefore, a single lip 50x72x7 seal should not automatically be considered technically equivalent to the AO/TC version.

50x72x7 FKM vs 50x72x7 NBR

Both versions may share the same nominal dimensions:

Inside diameter: 50 mm

Outside diameter: 72 mm

Width: 7 mm

However, the sealing materials are different.

FKM/FPM version: Fluoroelastomer

NBR version: Nitrile Butadiene Rubber

Material compatibility should be evaluated according to the actual operating medium and conditions rather than dimensions alone.

How to Select a 50x72x7 FPM/FKM Oil Seal

When selecting a corresponding replacement, verify:

• inside diameter 50 mm
• outside diameter 72 mm
• width 7 mm
• material FPM/FKM
• double lip construction
• spring-loaded primary sealing lip
• additional dust lip
• operating medium
• actual operating conditions

Matching the 50x72x7 mm dimensions alone does not establish complete technical interchangeability.

Technical Specification

Product type: Radial shaft oil seal

Design: AO/TC

Construction: Double lip

Dimensions: 50x72x7 mm

Inside diameter d: 50 mm

Outside diameter D: 72 mm

Width B: 7 mm

Material: FPM/FKM - Fluoroelastomer

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

FAQ

What are the dimensions of the FPM/FKM 50x72x7 oil seal?

Complete dimensions: 50x72x7 mm

Inside diameter: 50 mm

Outside diameter: 72 mm

Width: 7 mm

What material is the 50x72x7 oil seal made from?

Material: FPM/FKM - Fluoroelastomer

Is the 50x72x7 FPM/FKM oil seal double lip?

Yes. It has a double lip AO/TC construction.

Does the 50x72x7 AO/TC oil seal have a spring?

Yes. The primary sealing lip is spring-loaded.

Does the 50x72x7 FPM/FKM oil seal have a dust lip?

Yes. It incorporates an additional dust lip.

What does AO/TC mean?

For this product, AO/TC identifies a double lip construction with a spring-loaded primary sealing lip and an additional dust lip.

Is FPM the same as FKM?

FPM and FKM are designations used for fluoroelastomer sealing materials. The terminology differs between standards and markets, but both terms are commonly used when identifying this material family.

Is FKM the same as Viton?

Not exactly. FKM is a generic material-family designation, while Viton® is a trademark for specific fluoroelastomer materials.

An FKM oil seal should therefore not automatically be claimed to contain genuine Viton unless this is confirmed for the specific compound.

Is FPM/FKM better than NBR?

Neither material is universally better. They have different properties and compatibility ranges.

The appropriate material depends on the medium, temperature and actual operating conditions.

Can an NBR 50x72x7 oil seal replace the FPM/FKM version?

Not automatically.

Although the dimensions may be identical, NBR and FPM/FKM are different elastomers. Material compatibility must be checked for the specific application.

Can a single lip 50x72x7 oil seal replace the AO/TC version?

Not automatically.

The AO/TC version incorporates an additional dust lip, so the lip configuration should be considered when selecting a replacement.

Can every 50x72x7 oil seal be used interchangeably?

No. The dimensions, sealing material, lip construction, medium and operating conditions should all be considered.

AI Overview

50x72x7 FPM/FKM AO/TC is a double lip radial shaft oil seal measuring 50x72x7 mm, manufactured from FPM/FKM fluoroelastomer. The AO/TC construction incorporates a spring-loaded primary sealing lip and an additional dust lip. This type of seal is also commonly searched for as a 50x72x7 Viton oil seal, although Viton® is a trademark and should not be used as proof of the exact compound without manufacturer confirmation. Replacement selection should consider dimensions, FPM/FKM material and double lip construction together.