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Help CenterDouble Coil Spring Washer Used in Heavy Machinery and Construction Equipment
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Anping County Boli Hardware Wiremesh Products Factory takes pride in offering the Double Coil Spring Washer specifically engineered for heavy machinery and construction equipment. As a professional manufacturer since 1998, we have accumulated over two decades of expertise in producing high-quality fasteners that meet the rigorous demands of industrial applications. Our double coil spring washer is designed to provide superior vibration resistance and locking force, ensuring that critical bolted joints remain secure under extreme loads and dynamic conditions. With an annual export value of US$5–10 million and a global presence spanning North America, South America, Europe, Asia, Africa, and Oceania, we deliver reliable solutions trusted by engineers worldwide.
The unique double coil structure distinguishes this washer from standard single-coil types. By forming two interlocking helical coils, the washer generates a higher and more uniform spring force, effectively preventing loosening caused by shock, vibration, and thermal expansion. This makes it an ideal choice for applications in bulldozers, excavators, cranes, rock crushers, and other heavy-duty equipment where safety and reliability are paramount.
Key Features & Technical Specifications
- Enhanced Locking Performance: The double coil design provides up to 30% more clamping force compared to single coil washers, minimizing the risk of fastener failure.
- High Fatigue Resistance: Made from premium spring steel (e.g., 65Mn, 60Si2Mn) with optimized heat treatment, the washer withstands repeated loading cycles without permanent deformation.
- Customizable Dimensions: Available in a wide range of wire diameters (2.0–8.0 mm), outer diameters (10–50 mm), and inner diameters (5–30 mm). Custom sizes can be produced per drawing or sample.
- Surface Treatment Options: Choose from black oxide, zinc plating, phosphating, or plain finish to suit specific corrosion resistance requirements and environmental conditions.
- Consistent Quality: Manufactured with precision tooling and strict quality control, each batch is inspected for dimensional accuracy, hardness, and spring force consistency.
- Easy Installation: Compatible with standard hex bolts and nuts, no special tools required for assembly.
| Parameter | Standard Range | Customization |
|---|---|---|
| Wire Diameter (d) | 2.0 – 8.0 mm | ±0.1 mm tolerance |
| Outer Diameter (OD) | 10 – 50 mm | Available upon request |
| Inner Diameter (ID) | 5 – 30 mm | Custom ID per bolt size |
| Material Hardness (HRC) | 38 – 45 | Adjustable per specification |
| Surface Treatment | Black oxide, Zinc, Phosphate | Other finishes available |
Beyond the standard specifications, our double coil spring washers undergo rigorous testing to ensure they meet the demands of heavy machinery applications. The spring steel material undergoes a carefully controlled heat treatment process that balances hardness with ductility, preventing brittleness while maintaining high elastic limits. The double coil geometry is formed using advanced cold-forming technology, which guarantees consistent coil pitch and uniform load distribution across the entire washer surface.
Benefits to Your Operation:
- Reduce Maintenance Costs: By preventing fastener loosening, the washer minimizes the need for periodic retightening and reduces the risk of equipment downtime.
- Improve Safety: Secure bolted joints are critical in heavy equipment; our washer helps avoid catastrophic failures that could endanger personnel or damage machinery.
- Enhance Equipment Longevity: Consistent clamping force reduces wear on mating components, extending the service life of assemblies.
- Flexible Supply: As a manufacturer with decades of experience, we can adapt to your volume requirements, from small batch prototypes to large-scale production runs.
With an annual export value of US$5–10 million, our factory has established a reliable supply chain and shipping network. We regularly export via major ports including Tianjin, Qingdao, Shanghai, and Foshan, delivering to customers in over 15 regions worldwide. Our commitment to quality is reflected in every step of production: from raw material selection to final packaging, we maintain strict standards to ensure that each double coil spring washer performs as expected in the toughest environments.
We understand that every application may have unique requirements. That’s why we offer customization services for dimensions, surface treatment, and packaging. Our experienced engineering team can work with you to design a washer that perfectly matches your bolt specifications and operating conditions. Whether you need a standard size or a specialized design, we are here to provide a cost-effective solution.
Frequently Asked Questions
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Q: What is the difference between a double coil spring washer and a single coil spring washer?
A: A double coil spring washer has two intertwined helical coils, generating a higher and more uniform spring force. This provides superior locking capability, especially in high-vibration environments like heavy machinery and construction equipment. -
Q: Can the washer be used with metric or imperial bolts?
A: Yes, we can produce washers with inner diameters matching both metric and imperial bolt sizes. Please provide your bolt specifications when ordering. -
Q: What surface treatment is best for outdoor or corrosive environments?
A: For outdoor use, zinc plating or phosphating offers good corrosion resistance. Black oxide provides moderate protection but is more suitable for indoor applications. We can also apply other coatings per your request. -
Q: Do you offer samples for testing?
A: Yes, we provide samples for evaluation. Please contact our sales team to discuss sample availability and shipping costs. -
Q: What is the typical lead time for a bulk order?
A: Lead time depends on order quantity and customization. For standard sizes, it is usually 15–25 working days. Custom orders may take slightly longer. We will confirm the exact schedule upon order confirmation. -
Q: Are your washers certified to any international standards?
A: Our products are manufactured to meet general industry standards. Specific certifications can be discussed based on your requirements. We can also provide material test reports and dimensional inspection certificates upon request. -
Q: How should I store the washers to maintain their performance?
A: Store in a dry, clean environment away from moisture and chemicals. If the surface treatment is zinc or phosphate, avoid prolonged exposure to acidic or alkaline conditions. Proper storage ensures long-term spring properties. -
Q: Can I get a custom design with a specific number of coils or special shape?
A: Yes, we can customize the number of coils, coil pitch, and overall shape to meet your specific application. Please provide a drawing or detailed specification for a quotation.
At Anping County Boli Hardware Wiremesh Products Factory, we are dedicated to providing high-quality fasteners that keep your equipment running safely and efficiently. With over 20 years of manufacturing experience, a strong export track record, and a customer-centric approach, we are your reliable partner for double coil spring washers. Contact us today to discuss your requirements or request a quotation. We look forward to supporting your heavy machinery and construction equipment applications with our premium products.
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