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NOK

NOK

1. Company Overview
NOK Corporation, established in 1939, is one of Japan’s earliest manufacturers of oil seals and a global leader in sealing products. The company holds over 70% market share of oil seals in Japan and maintains a strong presence internationally. NOK is dedicated to delivering high-quality sealing solutions with a global reach and a broad customer base.

2. Development History

  • 1939: Company founded and began manufacturing oil seals.

  • 1959: Proposed the “theory of friction and lubrication in oil seal sealing,” significantly contributing to sealing technology advancements.

  • 1960s: Developed high-temperature and high-pressure-resistant polyurethane synthetic rubber and obtained global patents.

  • 1980s: Actively expanded into international markets, exporting products worldwide.

  • 1990s: Acquired ISO 9001 quality management certification, enhancing quality and management capabilities.

3. NOK Oil Seal Product Introduction
(1) Functions
NOK oil seals effectively:

  • Prevent leakage of lubricants and fluids.

  • Block external contaminants such as moisture, dust, sand, and organic solvents.

  • Ensure stable system operation and provide superior sealing performance.

(2) Product Features

  • High-Quality Materials: Made with top-grade materials like FKM (fluoroelastomer), VMQ (silicone rubber), and PU (polyurethane).

  • Excellent Sealing Performance: Effectively prevents leakage of grease, fluids, and gases.

  • High Wear Resistance: Advanced manufacturing processes and materials extend service life.

  • Diverse Designs: Available in various models and sizes for flexible applications.

  • High Environmental Adaptability: Suitable for harsh conditions such as high temperature, high pressure, high speed, and low temperature.

4. Application Fields

  • Automotive Industry: Used in critical components such as engines, transmissions, drivetrains, and steering systems.

  • Industrial Machinery: Widely applied in hydraulic, pneumatic, and power transmission equipment.

  • Household Appliances: Applied in washing machines, refrigerators, etc., to improve durability and safety.

  • Construction Machinery: Withstands harsh working environments, suitable for heavy equipment such as excavators and loaders.

5. Common Oil Seal Specifications and Materials
(1) Common Models

  • USH

  • UPH

  • UPI

  • LBH

  • IDI

  • ODI

(2) Main Materials and Characteristics

  • NBR (Nitrile Rubber): Excellent oil resistance, suitable for general industrial sealing.

  • FKM (Fluoroelastomer): High resistance to heat and chemicals, commonly used in automotive engines and transmission systems.

  • HNBR (Hydrogenated Nitrile Rubber): Ideal for long-term use under high temperatures and pressure, with enhanced weather resistance.

  • PTFE (Polytetrafluoroethylene): Low friction and high chemical resistance, suitable for special dynamic sealing.

  • PU (Polyurethane): Outstanding wear and pressure resistance, widely used in hydraulic system seals.

6. Maintenance and Care Recommendations
To ensure optimal performance and longevity of NOK oil seals, the following should be observed:

  • Regular Inspection and Replacement: Keep the sealing surface clean to prevent wear.

  • Avoid Damage and Corrosion: Prevent mechanical damage and exposure to chemicals during handling.

  • Keep in Dry Conditions: Avoid rusting of metal rings and springs.

  • Avoid Direct Sunlight: Reduce aging effects from ozone and ultraviolet light.

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