70x110x13 B2 NBR A/SC Rotary Shaft Oil Seal Single Lip Metal Case

What Is the 70x110x13 B2 NBR A/SC Oil Seal?

The 70x110x13 B2 NBR A/SC Rotary Shaft Oil Seal is a precision-engineered radial shaft seal designed to retain lubricants while protecting rotating equipment against dust, dirt and other external contaminants. Manufactured from NBR (Nitrile Butadiene Rubber) and reinforced with a B2 metal outer case, it provides excellent dimensional stability, secure housing retention and long-lasting sealing performance.

Featuring an A/SC single spring-loaded sealing lip, the seal maintains constant contact with the rotating shaft to ensure reliable oil retention while minimizing friction and wear. Measuring 70 mm inner diameter, 110 mm outer diameter and 13 mm width, it is widely used in gearboxes, pumps, electric motors, speed reducers, agricultural machinery and industrial drive systems.

Design and Construction

The B2 A/SC design combines a durable metal outer shell with a high-performance elastomer sealing element.

Key construction features include:

• B2 metal outer case
• A/SC single sealing lip
• Integrated garter spring
• NBR sealing material
• Precision-machined sealing edge
• High housing stability
• Reliable shaft contact pressure

The rigid metal case ensures accurate installation in the housing, while the spring-loaded sealing lip maintains consistent radial pressure throughout the seal's service life.

Technical Specification

Manufacturer: GRN

Product Type: Rotary Shaft Oil Seal

Design: B2 A/SC

Material: NBR (Nitrile Butadiene Rubber)

Inner Diameter: 70 mm

Outer Diameter: 110 mm

Width: 13 mm

Outer Case: Metal

Sealing Lip: Single

Garter Spring: Yes

Colour: Black

How Does a Rotary Shaft Oil Seal Work?

A rotary shaft oil seal forms a dynamic seal between a rotating shaft and a stationary housing.

The spring-loaded sealing lip continuously contacts the shaft surface to:

• Prevent lubricant leakage
• Protect bearings
• Exclude dust and dirt
• Reduce contamination
• Extend component service life
• Improve equipment reliability

The metal outer case keeps the seal securely positioned within the housing, ensuring stable sealing performance during continuous operation.

Why Choose NBR?

NBR (Nitrile Butadiene Rubber) is one of the most widely used sealing materials for rotary shaft applications.

Its main advantages include:

• Excellent resistance to mineral oils
• Good compatibility with lubricating greases
• High abrasion resistance
• Good mechanical strength
• Excellent elasticity
• Reliable long-term sealing performance
• Cost-effective solution for industrial applications

These characteristics make NBR an excellent choice for general-purpose rotary shaft sealing.

Selecting the Correct Oil Seal

When choosing a rotary shaft seal, it is important to consider:

• Shaft diameter
• Housing bore diameter
• Seal width
• Sealing material
• Operating temperature
• Shaft rotational speed
• Lubricant type
• Working environment
• Shaft surface condition

Correct seal selection is essential for maximizing sealing efficiency and service life.

Installation Recommendations

For reliable performance:

• Clean the housing before installation.
• Inspect the shaft sealing surface.
• Lubricate the sealing lip before assembly.
• Use the correct installation tool.
• Press the seal evenly into the housing.
• Avoid damaging the sealing lip during installation.

Proper installation significantly increases seal durability and operational reliability.

Common Causes of Oil Seal Failure

Typical causes include:

• Worn shaft surfaces
• Incorrect installation
• Contamination
• Excessive shaft runout
• Dry running
• Excessive operating temperature
• Incorrect material selection
• Poor lubrication

Regular inspection and preventive maintenance help maximize seal life.

Industrial Applications

The 70x110x13 B2 NBR A/SC Oil Seal is commonly used in:

• Industrial gearboxes
• Electric motors
• Industrial pumps
• Speed reducers
• Agricultural machinery
• Construction equipment
• Industrial drive systems
• Conveyor equipment
• Manufacturing machinery
• Processing equipment
• OEM production
• Industrial MRO maintenance

OEM Manufacturing and Industrial Maintenance

Rotary shaft oil seals are essential components for protecting rotating equipment and extending machine life.

For OEM manufacturers and maintenance engineers, they help:

• Prevent lubricant leakage
• Protect bearings from contamination
• Reduce maintenance costs
• Improve equipment reliability
• Extend machine service life
• Minimize unexpected downtime

Their standardized dimensions and durable construction make them suitable for a wide variety of industrial applications.

Why Engineers Choose B2 A/SC Oil Seals

• Metal outer case for secure housing fit
• Single spring-loaded sealing lip
• Excellent resistance to mineral oils
• Low-friction operation
• High wear resistance
• Long operational life
• Suitable for OEM production and MRO maintenance
• Reliable sealing performance in rotating equipment

Frequently Asked Questions (FAQ)

What does the B2 design mean?

B2 indicates a rotary shaft oil seal with a metal outer case, providing excellent housing retention and dimensional stability.

What does A/SC mean?

A/SC identifies a single spring-loaded sealing lip designed for reliable lubricant retention and effective shaft sealing.

Is NBR resistant to mineral oils?

Yes. NBR offers excellent resistance to mineral oils, lubricating greases and many petroleum-based fluids.

Can this oil seal be used in gearboxes?

Yes. It is widely used in gearboxes, pumps, electric motors, reducers and numerous industrial drive systems.

Does this seal include a garter spring?

Yes. The sealing lip incorporates a garter spring that maintains constant sealing pressure throughout its service life.

Where is this oil seal commonly installed?

It is commonly installed in industrial machinery, agricultural equipment, electric motors, pumps, conveyor systems, OEM equipment and industrial maintenance applications.