Siam Keeper Manufacturing Co., Ltd.

Seal Washer – High-Performance Gasket for Leak Prevention

Seal washers are gaskets designed to prevent leakage in bolt and nut joints. They serve as an effective alternative to liquid gaskets and traditional copper washers. By combining special synthetic rubber with a metal core, these washers provide excellent resistance to oil, heat, and weather conditions, ensuring superior sealing performance.
Siam Keeper Manufacturing, a subsidiary of Keeper Co., Ltd., specializes in manufacturing and supplying high-quality automotive parts, industrial machinery components, and electronic equipment. With a strong distribution network in Thailand and Southeast Asia, we can promptly respond to customer demands.
■ Key Features
・Excellent leak prevention: Special synthetic rubber combined with a metal core ensures a tight seal.
・High durability: Made from NBR, FKM, and EPDM, offering superior resistance to oil, heat, and environmental conditions.
・Reusable: Can be used 2-3 times for cost-effective sealing solutions.
・Easy installation: Can be used on both sides without differentiation and is designed to stay securely in place.
・Reduced surface finish requirements: Compared to copper washers, it requires less precision on the contact surface.
■ Specifications
1. Materials:
- NBR (Nitrile Rubber) – Suitable for general oil-resistant applications.
- FKM (Fluoroelastomer) – Ideal for high-temperature and chemical-resistant applications.
- EPDM (Ethylene Propylene Diene Monomer) – Recommended for water-related applications.
2. Temperature range: Varies by application; standard models support -30℃ to 200℃.
3. Pressure resistance:
- Standard types (W, WS₁, WCS) – Supports a maximum static pressure of 294 kPa (3 kgf/cm²).
- For fluctuating pressure environments, usage should be limited to 40% of static pressure.
4. Tightening torque: Depends on the specification (recommended to tighten at least 80% of the maximum torque value).
■ Applications
・Automotive industry: Sealing in engines, oil systems, brake systems, and fuel systems.
・Industrial machinery: Sealing in hydraulic systems, compressors, and gearboxes.
・Electronic equipment: Sealing in oil cooling systems and waterproof enclosures.
High-performance seal washers provide reliable leak prevention and long-term durability. If you are looking for sealing solutions for automotive, industrial machinery, or electronic equipment applications, feel free to contact us.
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Seal Washer – High-Performance Gasket for Leak Prevention

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