Custom Rotary Shaft Oil Seals

KOK develops custom rotary shaft oil seals for OEM and Tier-1 customers requiring application-specific sealing solutions beyond standard DIN or JIS profiles.

Custom development is driven by functional requirements, operating conditions, and system-level constraints rather than catalogue adaptation.

Contents

• Application-Driven Seal Development
• Materials & Design Expertise
• High-Speed & Critical Operating Conditions
• Tooling, Validation & Production Control

Application-Driven Seal Development

Each custom rotary shaft seal is engineered based on defined parameters, including:

• Shaft diameter, surface finish, and run-out
• Rotational speed and duty cycle
• Operating temperature range
• Lubricant chemistry and pressure conditions
• Environmental exposure (dust, water, contamination)

This approach enables seal designs optimised for performance, durability, and long-term reliability in their intended application.

Materials & Design Expertise

KOK has extensive experience designing rotary shaft seals using a wide range of elastomer compounds and construction types, including:

• NBR, HNBR, ACM, AEM, FKM, VMQ, XNBR
• Single-lip, double-lip, and multi-lip configurations
• Rubber-covered, metal-cased, and hybrid constructions

Where required, designs may reference DIN or JIS dimensional frameworks, or be developed as fully application-specific profiles.

High-Speed & Critical Operating Conditions

Our custom rotary shaft seals are developed for demanding environments, including high-speed rotating applications, with validated designs operating at speeds up to 12,000 rpm, depending on shaft diameter, lubrication, and system conditions.

KOK has supported sealing solutions for non-standard and harsh applications, including propulsion and high-speed shaft systems where combined requirements for oil retention, water exclusion, and durability apply.

These developments are typically engineered in close collaboration with OEM customers.

Tooling, Validation & Production Control

• All tooling is designed and manufactured in-house
• Development programs support prototyping through series production
• Dimensional and material consistency is maintained across production volumes

This vertical control enables efficient iteration, protected know-how, and stable long-term supply for OEM programs.