Sealing Washers for Bolts

Sealing Washers for Bolts

Sealing washers for bolts are high-performance mechanical components that integrate fastening and sealing functions, widely used in new energy, automotive manufacturing, electrical equipment, hydraulic systems, pressure vessels, and industrial piping. They provide a reliable sealing barrier during bolt tightening, effectively preventing leakage of liquids, gases, or dust, while improving the corrosion resistance and shock resistance of the connection. Unlike traditional flat washers, sealing washers typically consist of a metal body and an elastic sealing layer (common combinations include stainless steel + NBR, aluminum + fluororubber, copper + silicone rubber, etc.). Through structural optimization and material matching, they achieve a comprehensive effect of dual sealing, anti-loosening, and extended service life.
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Products Description

 

1. Integrated Sealing Structure for More Thorough Protection

The sealing washers for bolts feature a composite structure of metal and elastomer. When the bolts are tightened, the elastic sealing ring is evenly compressed, forming a ring-shaped sealing surface that effectively prevents media leakage. It maintains stable performance even under high-pressure, high-temperature, or vibration environments.

2. Multiple Material Options for Different Working Conditions

Depending on the application environment, we offer a variety of material options:

Stainless Steel + NBR: Oil-resistant, wear-resistant, suitable for hydraulic and mechanical systems;

Copper + Fluororubber (FKM): Preferred for high-temperature and high-pressure sealing;

Aluminum + Silicone Rubber: Lightweight design, strong aging resistance;

Carbon Steel + Neoprene Rubber (CR): High cost-performance ratio, suitable for general waterproof sealing;

Special Alloy + EPDM: Used in new energy and chemical corrosion protection scenarios.

sealing washers for bolts
Manufacturing Advantages
 
 
 

Independent Mold and Precision Stamping Capabilities

We have our own mold development center and utilize high-precision stamping equipment (accuracy ±0.02mm), meeting the stringent requirements for dimensional stability and consistency in mass production.

 
 

Metal-Rubber Integrated Molding Technology

Through advanced hot-press vulcanization composite technology, we achieve a high-molecular chemical bond between the metal Stainless Steel Nut for Screw Bolt and the sealing layer, making the sealing layer less prone to peeling and bubbling, with durability far exceeding traditional adhesive structures.

 
 

Surface Corrosion Protection and Wear Resistance Treatment

We employ appropriate surface treatment processes for different metal materials, such as nickel plating, electrophoresis, anodizing, and passivation, effectively improving corrosion resistance and surface hardness, ensuring long-term stable use.

 
 

Comprehensive Quality Control System

From raw material warehousing and semi-finished Cross Recessed Screw testing to finished product sampling, all processes are conducted in accordance with the ISO9001 quality system. We are equipped with testing equipment such as optical dimension measuring instruments, hardness testers, and sealing performance testers to ensure that every batch of products meets international standards.

 

Production Process of sealing washers for bolts

 

Material & Design Excellence

 

 

1. Superior Substrates for Durability and Reliability

Stainless Steel (304/316): Corrosion-resistant, high-temperature resistant, suitable for chemical and marine environments;

Aluminum Alloy (6061/5052): Lightweight and with good thermal conductivity;

Copper and Brass: Excellent electrical conductivity, suitable for sealing electrical and new energy terminal connections;

Special Steels: Used in high-pressure and extreme environments for mechanical equipment.

2. High-Elasticity Sealing Layer for Multiple Media

The sealing layer uses high-quality rubber materials (NBR, FKM, EPDM, silicone, etc.), possessing excellent oil resistance, aging resistance, and chemical corrosion resistance, ensuring consistent sealing performance under high temperature, high pressure, low temperature, or acid/alkali conditions.

3. Engineered Structural Design

The sealing lip, compression ratio, and contact angle of the gasket have been optimized through finite element simulation, ensuring a tighter seal while reducing rubber damage caused by excessive compression, resulting in more durable and stable Self Tapping Screws.

Strict Selection of Steel Wire for sealing washers for bolts

 

Application Fields

 

Bolt sealing washers are widely used in the following fields, providing efficient sealing and protection for engineering connections:

 

New Energy Industry: Battery pack housings, energy storage systems, high-voltage busbar connections;

Automotive and Commercial Vehicle Manufacturing: Engine, hydraulic lines, and braking system Toggle Bolts seals;

Hydraulic and Pneumatic Systems: Pipe fittings and pump body thread seals;

Electrical and Electronic Equipment: Waterproof control boxes, motor end covers, and sensor interfaces;

Mechanical Equipment and Pressure Vessels: Oil-proof, gas-proof, and dust-proof bolt connections;

Marine and Chemical Equipment: Corrosion-resistant threaded sealing components.

 

In diverse industrial application scenarios, Sealing Washers for Bolts provide long-term, reliable structural protection for equipment through superior sealing performance and environmental resistance.

 

Application of sealing washers for bolts

 

 

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Mr Terry from Xiamen Apollo

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