Cassette, Unitized & Grease Seals

KOK manufactures cassette seals, unitized seals, and grease seals for heavy-duty rotating applications, supplying primarily original equipment (OE) programs in agricultural, off-highway, and industrial machinery.

These seal types are integrated, multi-component sealing systems used to protect bearings, hubs, and driveline components operating in environments with high levels of contamination, misalignment, and load variation.

Seal Architecture & Construction

Cassette, unitized, and grease seals manufactured by KOK are produced according to customer-defined designs and specifications and typically incorporate multiple functional elements assembled into a single unit, such as:

• Primary and secondary sealing lips
• Integrated wear rings or counterfaces
• Static and dynamic sealing interfaces
• Contamination exclusion and grease retention features

This class of seals is used where conventional radial shaft seals are not sufficient to meet durability and contamination-resistance requirements.

Manufacturing Scope

KOK manufactures cassette, unitized, and grease seals strictly to customer drawings and application specifications, with production focused on:

• Dimensional accuracy and assembly consistency
• Compatibility with defined hub and shaft geometries
• Tolerance to shaft eccentricity and misalignment as specified
• Stable sealing performance under defined speed and load conditions

Materials & Bonded Structures

These sealing systems may incorporate combinations of:

• Engineered elastomer sealing elements
• Metal carriers and wear components
• Rubber-to-metal bonded structures

Material systems are manufactured in accordance with customer-specified material requirements, selected to meet defined abrasion resistance, chemical exposure, temperature range, and service-life criteria.

Quality & Validation

Cassette, unitized, and grease seals are produced using controlled molding, bonding, and assembly processes, with in-process and final inspection to ensure:

• Correct positioning and alignment of sealing elements
• Dimensional consistency across production batches
• Bond integrity and assembly stability

Where required, validation and testing are performed in accordance with customer specifications.

Application Coverage

KOK manufactures these sealing systems for OE applications including:

• Agricultural and farm machinery wheel hubs and wheel ends
• Heavy-duty drivetrains
• Off-highway and slow-speed rotating equipment

Custom configurations are supported where defined by customer drawings and program requirements.