Rotary Shaft Seal 90x125x13 NBR B2 - Oil Seal

Applications

The 90x125x13 NBR B2 rotary shaft seal is a double-lip oil seal engineered for reliable sealing of rotating shafts in industrial, hydraulic, and automotive systems. Its reinforced B-type housing and NBR elastomer ensure stable performance where protection against oil leakage, grease escape, and external contamination is required.

This shaft seal is widely used in gearboxes, pumps, motors, industrial drives, agricultural machinery, construction equipment, and general mechanical assemblies requiring precise rotary sealing. The B2 double-lip configuration provides superior dust exclusion, making it ideal for applications exposed to abrasive or dirty environments.

Advantages

• Double-lip (B2) sealing performance - primary lip retains oil and lubrication, while the secondary dust lip protects against contaminants, extending equipment life.

• High durability in demanding conditions - NBR (nitrile rubber) delivers dependable resistance to oils, fuels, grease, and hydraulic fluids.

• Stable operation on rotating shafts - consistent contact pressure ensures reliable sealing even under vibration, moderate shaft misalignment, and temperature variations.

• Designed for industrial and automotive applications - suitable for engines, drives, power transmissions, hydraulic systems, and mechanical assemblies requiring long-term shaft protection.

• Protected metal-reinforced case - maintains structural rigidity and ensures secure press-fit installation into the housing.

Technical Data

• Inner Diameter (ID): 90 mm

• Outer Diameter (OD): 125 mm

• Width: 13 mm

• Material: NBR (nitrile rubber)

• Type: B2 (double-lip oil seal with dust lip)

• Application: rotary shafts, gearboxes, engines, pumps, industrial machinery

• Function: oil retention, contaminant exclusion, rotary seal integrity

Main Description

The Rotary Shaft Seal 90x125x13 NBR B2 is a precision-engineered oil seal designed to provide long-term sealing efficiency in rotational systems. Manufactured from high-quality NBR, it offers dependable resistance to oils, fuels, lubricants, and grease, ensuring stable performance across a broad range of industrial applications.

The double-lip B2 design enhances sealing reliability: the primary lip handles lubrication retention, while the secondary lip protects the system from external contaminants such as dust, moisture, and particulates. This construction makes the seal particularly effective in heavy-duty industrial applications, where equipment uptime and reliability are critical.

With dimensions 90×125×13 mm, this rotary shaft seal ensures precise fitment on 90 mm shafts with 125 mm housings, delivering optimal alignment and tight sealing performance. Its metal-reinforced outer shell guarantees secure mounting, even in systems exposed to vibration or dynamic loads.

This product is a trusted choice for engineers, maintenance teams, and industrial procurement specialists seeking a durable, cost-efficient, and technically reliable shaft sealing ring for engines, pumps, hydraulic units, drive systems, and complex mechanical equipment.

FAQ

What is the advantage of a B2 double-lip seal over a single-lip seal?
A double-lip seal includes a secondary dust lip that protects the system from contaminants. This significantly increases service life in dirty or abrasive environments compared to a single-lip design.

Is NBR suitable for oil and lubricant exposure?
Yes. NBR offers excellent resistance to oils, grease, fuels, and hydraulic fluids, making it one of the most commonly used materials for oil seals in industrial machinery.

How do I select the correct shaft seal size?
Match the seal’s inner diameter (ID) to the shaft diameter, the outer diameter (OD) to the housing bore, and ensure the width fits your installation space. Also consider the material and lip type based on operating conditions.

Can this seal be used in high-load industrial applications?
Yes. The reinforced case and double-lip construction make this seal suitable for demanding industrial and automotive systems with moderate shaft speeds and dynamic conditions.

Is a double-lip seal recommended for dusty environments?
Absolutely. The dust lip offers additional protection, making B2 seals ideal for equipment operating in agriculture, construction, machining, and heavy industry.