70x100x6 NBR SC - Single Lip Rotary Shaft Oil Seal

Technical Specifications - 70x100x6 NBR SC

What Does 70x100x6 NBR SC Mean?

70x100x6 mm - Mounting Dimensions

The dimensional designation specifies:

• 70 mm - nominal shaft diameter.

• 100 mm - nominal housing bore diameter.

• 6 mm - nominal axial seal width.

The 6 mm width is an important selection parameter because rotary shaft oil seals with identical inside and outside diameters may be available in different widths.

Matching shaft and housing diameters alone does not confirm interchangeability.

NBR - Nitrile Butadiene Rubber

NBR, or nitrile butadiene rubber, is one of the most commonly used elastomers in industrial sealing applications.

It generally provides good resistance to many mineral oils, greases and conventional lubricants.

NBR is widely used in dynamic sealing applications where a flexible sealing lip operates in contact with a rotating shaft.

Its actual chemical and temperature resistance depends on the specific elastomer formulation and operating conditions.

Compatibility with every industrial fluid should not be assumed.

SC - Single Lip Oil Seal Profile

The SC profile identifies a rotary shaft oil seal with one primary sealing lip.

Unlike double lip TC oil seals, the SC design does not incorporate an additional dust exclusion lip.

This type of construction is commonly used in applications where the primary requirement is lubricant retention and an additional dust lip is not specified.

The SC designation describes a general sealing configuration but does not guarantee identical construction details across all manufacturers.

Construction and Operating Principle

Primary Sealing Lip

The primary sealing lip operates in direct contact with the rotating shaft surface, which has a nominal diameter of 70 mm.

Its main function is to restrict the escape of oil or another compatible lubricant from the sealed mechanical assembly.

Effective sealing depends on:

• Correct sealing lip contact.

• Shaft surface condition.

• Suitable lubrication.

• Operating temperature.

• Rotational speed.

• Pressure conditions.

• Correct installation.

Damage to the shaft surface or incorrect installation may lead to accelerated wear and leakage.

Single Lip Construction

The oil seal features one primary sealing lip.

The absence of an additional dust lip distinguishes it from double lip versions.

Depending on the operating environment, a single lip construction may be suitable where additional protection against external contamination is not required.

NBR Sealing Elastomer

Nitrile butadiene rubber forms the flexible sealing element that operates against the rotating shaft.

It is commonly used in many mechanical assemblies lubricated with compatible mineral oils.

Material compatibility with the actual operating fluid must be verified before installation.

Outer Seating Surface

The outer surface of the oil seal is designed to fit into a housing bore with a nominal diameter of 100 mm.

Correct seating is important for maintaining seal stability and restricting leakage between the seal and housing.

70x100x6 NBR SC vs TC Double Lip Oil Seals

The primary difference between SC and TC oil seals is the number of sealing lips.

The additional dust lip in TC oil seals can provide increased protection against external contamination.

However, it may also affect friction and lubrication conditions.

Single lip and double lip oil seals are not necessarily interchangeable, even when their dimensions are identical.

When Is an SC Oil Seal Appropriate?

An SC oil seal may be suitable when the primary sealing requirement is lubricant retention and the application does not require an additional dust exclusion lip.

The final decision must be based on the mechanical assembly's design and operating environment.

When Should a TC Oil Seal Be Considered?

A TC double lip oil seal may be considered when additional protection against dust and fine external contaminants is required.

However, replacement of an SC seal with a TC version requires verification of the installation and operating requirements.

NBR vs FKM/FPM Oil Seals

Oil seals with the same dimensions and construction may be manufactured from different elastomer materials.

Replacing NBR with FKM/FPM, or vice versa, requires verification of lubricant compatibility, temperature and equipment requirements.

Is FKM/FPM Always Better Than NBR?

No.

FKM/FPM generally offers higher thermal resistance, but material selection depends on the actual operating conditions.

NBR remains a widely used material for many conventional oil sealing applications.

Applications of 70x100x6 NBR SC

Single lip radial rotary shaft oil seals are used in appropriately designed mechanical assemblies containing rotating shafts.

Typical application categories include:

• Mechanical gearboxes.

• Machinery drive assemblies.

• Rotating mechanisms.

• Bearing housings.

• Industrial equipment.

• Manufacturing and workshop machinery.

These are general application categories for this type of sealing component, not a confirmed list of specific equipment models compatible with this product.

Final selection requires verification of the machine's technical documentation.

Mechanical Gearboxes

Radial rotary shaft oil seals help restrict lubricant leakage where rotating shafts pass through gearbox housings.

Correct selection depends on the shaft dimensions, lubricant and operating conditions.

Bearing Housings

Single lip oil seals may be used in suitable bearing arrangements to help retain lubricant.

The sealing system must be compatible with the housing geometry and operating environment.

Industrial Machinery

Single lip rotary shaft oil seals are commonly used in mechanical assemblies where rotating shafts require dynamic sealing.

The exact application must be verified against the equipment requirements.

Why the 6 mm Width Matters

Seal width is an important installation parameter.

For the 70x100x6 mm oil seal, the nominal axial width is 6 mm.

It should not automatically be replaced with a 70x100x7 mm, 70x100x8 mm or 70x100x10 mm oil seal.

A difference in width may affect:

• The position of the sealing lip on the shaft.

• Installation depth in the housing.

• Available axial installation space.

• Clearance from adjacent mechanical components.

Changing the seal width requires verification of the assembly design.

Can a Wider Oil Seal Be Installed?

Only if the housing geometry and mechanical assembly allow it.

Even when the wider seal physically fits, the sealing lip may contact a different area of the shaft.

This may affect sealing performance and wear.

Selection and Interchangeability

Before purchasing a 70x100x6 NBR SC oil seal, verify:

1. Nominal shaft diameter of 70 mm.

2. Nominal housing bore diameter of 100 mm.

3. Axial seal width of 6 mm.

4. Required SC single lip profile.

5. NBR elastomer material.

6. Type of operating fluid.

7. Operating temperature.

8. Shaft rotational speed.

9. Pressure conditions.

10. Shaft surface condition.

11. Lubrication requirements.

12. Required protection against external contamination.

Dimensional compatibility is necessary but may not be sufficient to establish complete interchangeability.

Can Another 70x100x6 mm Oil Seal Be Used?

Only if the replacement has suitable dimensions, material, construction and operating characteristics.

Matching dimensions alone do not establish complete technical equivalence.

Can an SC Oil Seal Be Replaced with a TC Version?

Not automatically.

The TC version incorporates an additional dust lip, which changes the sealing construction and may affect operating conditions.

Can a 70x100x7 mm Oil Seal Replace a 70x100x6 mm Seal?

Not without checking the assembly design.

The difference in width may affect sealing lip position and installation depth.

Installation and Operating Recommendations

Shaft Preparation

Before installation, clean the shaft and inspect the sealing contact surface.

Burrs, corrosion, grooves and other damage may cause accelerated sealing lip wear or leakage.

Housing Preparation

The housing bore should be clean, undamaged and correctly dimensioned.

Protecting the Sealing Lip

Avoid contact between the sealing lip and sharp edges, threads or shaft grooves during installation.

Use an appropriate installation sleeve where necessary.

Correct Installation Orientation

Install the oil seal according to the equipment manufacturer's instructions.

In typical lubricant-retaining applications, the primary sealing lip faces the sealed medium.

Lubrication

Provide suitable lubrication before starting the equipment.

Avoid unintended dry-running conditions.

Storage

Store the oil seal in a clean, dry environment, away from excessive heat, direct sunlight and substances that may damage the elastomer.

Avoid deformation of the sealing lip during storage.

Frequently Asked Questions - 70x100x6 NBR SC

What Are the Dimensions of a 70x100x6 Oil Seal?

The nominal inside diameter is 70 mm, the outside diameter is 100 mm and the axial width is 6 mm.

What Does NBR Mean?

NBR stands for nitrile butadiene rubber, an elastomer commonly used in sealing applications involving compatible oils and greases.

What Does SC Mean in an Oil Seal?

SC identifies a common single lip rotary shaft oil seal construction without an additional dust exclusion lip.

Is This a Single Lip Oil Seal?

Yes. It features one primary sealing lip and does not incorporate an additional dust lip.

Is NBR Suitable for Oil?

NBR is commonly used with many mineral oils.

Compatibility with a specific oil must be verified based on its composition and operating conditions.

Can an SC Oil Seal Be Replaced with a TC Double Lip Seal?

Not automatically.

The additional dust lip changes the construction and may affect friction and lubrication requirements.

Can a 70x100x7 mm Oil Seal Be Used Instead of 70x100x6 mm?

Not without checking the mechanical assembly.

The difference in width may affect sealing lip position and installation depth.

Does a Single Lip Oil Seal Protect Against Dust?

An SC oil seal does not incorporate an additional dust exclusion lip.

Protection against external contamination depends on the overall sealing arrangement and operating environment.

70x100x6 NBR SC - Quick Technical Overview

The 70x100x6 NBR SC is a single lip radial rotary shaft oil seal manufactured from nitrile butadiene rubber. It has a nominal inside diameter of 70 mm, an outside diameter of 100 mm and a width of 6 mm. The SC profile incorporates one primary sealing lip without an additional dust lip. NBR is widely used with compatible mineral oils and greases.

Rotary Shaft Oil Seals at simmering.pl

Rotary shaft oil seals are available through simmering.pl, a specialist supplier of industrial sealing components, bearings and mechanical replacement parts.

We serve industrial companies, maintenance departments, mechanical workshops and B2B customers.

Our warehouse and order processing operations are located in Lublin, Poland.

We supply customers throughout Poland and the European Union and offer worldwide shipping.

We also assist customers in identifying rotary shaft oil seals by dimensions, elastomer materials and construction profiles.