Cassette & Unitized Shaft Seals

Cassette Unitized Shaft Seals are heavy-duty rotary sealing assemblies designed to retain oil or grease while protecting bearings and rotating components from dirt, dust, mud and water. They are commonly used in agricultural machinery, construction equipment, heavy-duty vehicles and industrial applications operating in contaminated environments.

Unlike conventional radial shaft seals, cassette seals integrate the sealing element and its mating running surface into a single unit. This construction provides a dedicated surface for the sealing lip, reducing dependence on the original shaft surface condition and helping simplify seal installation and replacement.

Design Features & Advantages

Cassette seals typically incorporate a primary sealing lip, an integrated wear sleeve and additional contaminant exclusion features. Depending on the design, multiple auxiliary lips or labyrinth sealing arrangements may provide further protection in demanding operating environments.

Key features include:

• Unitized Construction: Combines the seal and running surface into one assembly for easier handling and installation.

• Integrated Wear Sleeve: Provides a dedicated running surface for the sealing lip, reducing the need for special shaft surface preparation.

• Contaminant Protection: Auxiliary sealing lips and labyrinth designs help prevent dirt, mud, dust and water ingress.

• Lubricant Retention: Helps retain oil or grease in wheel bearings, axles and other rotating assemblies.

• Heavy-Duty Performance: Designed for applications exposed to contamination, vibration and demanding service conditions.

Material & Design Options

Cassette unitized shaft seals are commonly available with NBR sealing elements, while FKM and HNBR compounds may be selected for applications requiring different temperature, lubricant compatibility or aging resistance.

Metal reinforcement and integrated running sleeves provide structural support. Sealing lip arrangements, external casing designs and auxiliary protection features vary according to the specific application.

Typical Applications

Cassette unitized shaft seals are widely used in:

• Agricultural tractors and harvesting machinery

• Construction and earthmoving equipment

• Wheel hubs and axle assemblies

• Heavy-duty trucks and off-highway vehicles

• Forestry and mining machinery

• Gearboxes and industrial rotating equipment

Standard & Custom Supply

CORA SEALS supplies cassette unitized shaft seals for industrial distributors, equipment manufacturers, maintenance contractors and aftermarket replacement applications.

Different dimensions, materials and sealing configurations can be sourced based on equipment requirements, technical drawings, samples or existing part numbers.

For quotations, please provide the shaft diameter, housing bore, seal width, required quantity and any available OEM part number. Information about the lubricant, operating temperature, shaft speed and working environment can also help confirm the appropriate seal design.