NBR 10x18x5 mm AO/TC Double Lip Radial Shaft Seal

Technical specifications

The dimensions 10x18x5 mm represent the nominal shaft diameter, housing bore diameter and seal width. They do not define installation tolerances or permissible operating limits.

What does NBR 10x18x5 AO/TC mean?

The product designation contains the essential information required for technical identification:

• NBR - nitrile butadiene rubber.

• 10 mm - nominal shaft diameter.

• 18 mm - nominal housing bore diameter.

• 5 mm - nominal seal width.

• AO - designation used for double lip radial shaft seals in Polish technical terminology.

• TC - international designation for a typical double lip construction with an elastomer-covered outer surface.

AO and TC are commonly used for corresponding sealing constructions. However, complete interchangeability must be confirmed against the specific product geometry.

AO/TC double lip sealing construction

1. Primary sealing lip

The primary sealing lip operates against the rotating shaft surface with a nominal diameter of 10 mm.

Its function is to limit lubricant leakage from the sealed mechanical assembly.

In a conventional AO/TC construction, the primary lip is supported by a circumferential garter spring that helps maintain appropriate contact pressure against the shaft.

The presence and exact design of the spring in this specific product require confirmation.

2. Additional protective dust lip

The second lip provides an additional barrier against dust, dirt and other external contaminants.

It helps protect the contact area between the primary sealing lip and the shaft.

However, an additional dust lip may increase frictional resistance. Shaft speed and lubrication conditions should therefore be considered, particularly in small mechanical assemblies.

3. Elastomer-covered outer surface

A conventional TC profile features an elastomer-covered outer surface and an internal reinforcing element.

The elastomer covering helps provide static sealing between the seal body and the housing bore.

Correct performance depends on appropriate installation fit and housing surface condition.

NBR - technical material properties

Nitrile butadiene rubber is widely used in technical rotating shaft sealing applications.

Appropriately selected NBR compounds typically provide:

• Good resistance to many mineral oils.

• Compatibility with numerous industrial greases.

• Suitability for oil-lubricated mechanical systems.

• Useful mechanical properties.

• Wear resistance dependent on the elastomer compound and operating conditions.

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

The maximum operating temperature, permissible pressure and peripheral shaft speed have not been confirmed for this specific seal.

AO/TC versus A/SC - sealing profile comparison

For a seal with a nominal width of only 5 mm, it is particularly important to confirm that the double lip construction matches the original design.

An AO/TC profile should not automatically be replaced with an A/SC 10x18x5 mm seal.

Applications of the NBR 10x18x5 mm radial shaft seal

Small radial shaft seals may be used in appropriately designed mechanical assemblies, including:

• Small mechanical gearboxes.

• Compact drive assemblies.

• Rotating shaft mechanisms.

• Oil- or grease-lubricated equipment.

• Compact mechanical systems requiring additional dust protection.

These are typical application categories for this type of seal, not a verified list of equipment compatible with this specific product.

Because no manufacturer, catalogue reference or OE number has been provided, specific equipment models cannot be reliably identified.

Comparison of 10x18x5 mm sealing constructions

The following table illustrates technical differences between sealing profiles. It does not confirm the commercial availability of every listed configuration in these dimensions.

These variants are included for technical comparison only and must not automatically be considered confirmed replacements.

Selection and interchangeability

Before ordering, verify:

1. Nominal shaft diameter - 10 mm.

2. Nominal housing bore diameter - 18 mm.

3. Installation width - 5 mm.

4. NBR elastomer material.

5. AO/TC double lip sealing profile.

6. Presence of the additional dust lip.

7. Type of sealed oil or grease.

8. Operating temperature and shaft rotational speed.

9. Condition of the shaft and housing surfaces.

10. Construction and designation of the original seal.

In small mechanical assemblies, particular attention should be paid to installation accuracy, shaft alignment and sealing lip friction.

Matching dimensions of 10x18x5 mm do not guarantee complete interchangeability between different sealing profiles.

Alternative designations and product identification

Common product identification variants include:

• NBR 10x18x5 AO/TC Oil Seal

• NBR 10x18x5 Double Lip Radial Shaft Seal

• TC 10x18x5 NBR Oil Seal

• AO 10x18x5 Shaft Seal

• Double Lip Oil Seal 10x18x5 NBR

• Radial Shaft Seal 10x18x5 TC

• Rotary Shaft Seal 10x18x5 NBR

• NBR 10x18x5 Dust Lip Oil Seal

• 10x18x5 NBR Double Lip Simmerring

• 10x18x5 mm NBR TC Shaft Seal

These are alternative identification terms, not additional manufacturer catalogue numbers.

Installation and operating recommendations

Before installation, thoroughly clean the shaft and housing bore.

Inspect the contact surfaces for scratches, corrosion, wear grooves and sharp edges.

The seal should be installed evenly using an appropriate installation tool, without applying force directly to the sealing lips.

In a conventional AO/TC arrangement, the primary sealing lip generally faces the medium being retained, while the additional dust lip faces the external environment.

The correct installation orientation should be confirmed using the equipment manufacturer's documentation.

For a seal measuring 10x18x5 mm, particular care should be taken to avoid deformation during installation.

FAQ - Frequently asked questions

1. What are the dimensions of the NBR 10x18x5 AO/TC oil seal?

The nominal dimensions are 10x18x5 mm, corresponding to a 10 mm inner diameter, 18 mm outer diameter and 5 mm width.

2. What does NBR mean?

NBR stands for nitrile butadiene rubber, a technical elastomer used in sealing applications involving many mineral oils and industrial greases.

3. What does the AO/TC sealing profile mean?

AO/TC identifies a conventional double lip radial shaft seal construction with a primary sealing lip and an additional protective dust lip.

4. Does this seal have two lips?

Yes. The AO/TC profile incorporates a primary sealing lip and an additional protective dust lip.

5. Can an AO/TC 10x18x5 mm seal be replaced with an A/SC profile?

Interchangeability must not be assumed. A/SC is normally a single lip profile, whereas AO/TC incorporates an additional dust lip.

6. Is this seal suitable for mineral oil applications?

NBR is generally compatible with many mineral oils. However, compatibility must be verified for the specific lubricant and operating conditions.

7. What is the maximum operating temperature?

The maximum operating temperature has not been confirmed for this specific product. It must be verified with the manufacturer.

8. Are all 10x18x5 mm radial shaft seals interchangeable?

No. In addition to dimensions, the sealing profile, elastomer material, lip construction and operating requirements must be checked.

NBR 10x18x5 AO/TC - key information (AI Overview)

The NBR 10x18x5 mm AO/TC is a double lip radial shaft seal with an additional protective dust lip. Nitrile butadiene rubber is commonly used in mechanical assemblies lubricated with compatible oils or greases. The AO/TC profile combines lubricant retention with additional protection against contamination. Correct selection requires verification of dimensions, construction and operating conditions.

The product is offered through the specialist B2B industrial trading platform simmering.pl, serving industrial companies, technical purchasing departments and maintenance operations, with worldwide shipping from stock in Poland.