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Help CenterDouble Coil Spring Washers Used in Heavy Machinery Assembly to Prevent Bolt Loosening
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As a professional manufacturer founded in 1998, Anping County Boli Hardware Wiremesh Products Factory has been dedicated to producing high-quality fastening components for over two decades. Our Double Coil Spring Washers are specifically engineered for heavy machinery assembly, where preventing bolt loosening under extreme vibration and dynamic loads is critical. With an annual export value of US$5–10 million, we supply to markets across North America, South America, Europe, Southeast Asia, and beyond, ensuring global customers receive reliable anti-loosening solutions.
This product features a unique double-coil design that provides superior elastic recovery and clamping force compared to standard single-coil washers. Manufactured from premium spring steel alloys, each washer undergoes strict quality control to guarantee consistent performance. Whether you are assembling excavators, crushers, or industrial presses, our double coil spring washers deliver long-lasting protection against fastener failure.
Below we highlight the key specifications and advantages of our double coil spring washers, helping you understand why they are an ideal choice for heavy-duty applications.
Key Features & Technical Specifications
- Double Coil Structure: Two concentric coils increase the washer's deflection range and maintain constant tension, effectively absorbing vibration and shock.
- Material Strength: Made from 65Mn, 60Si2Mn, or 50CrVA spring steel, heat-treated to a hardness of HRC 40–50, ensuring excellent fatigue resistance.
- Surface Finish Options: Available in plain, zinc plated, black oxide, or Dacromet coating for corrosion protection in harsh environments.
- Customizable Dimensions: Standard sizes from M6 to M30, with non-standard sizes offered upon request. Tolerances comply with DIN 127 and relevant international standards.
- Anti-Loosening Performance: The double-coil configuration provides up to 30% higher preload retention compared to standard spring washers, as verified by our in-house testing.
| Parameter | Value |
|---|---|
| Material | Spring Steel (65Mn, 60Si2Mn, 50CrVA) |
| Hardness | HRC 40–50 |
| Standard Sizes | M6 – M30 (inner diameter) |
| Coil Count | 2 (double coil) |
| Surface Coating | Plain, Zinc Plated, Black Oxide, Dacromet |
| Application Temperature | -40°C to +120°C (depending on coating) |
| Packaging | Bulk, Box, or Custom |
Why Choose Our Double Coil Spring Washers for Heavy Machinery? The assembly of heavy equipment often involves high torque, continuous vibration, and thermal expansion, which can cause bolts to loosen over time. Our double coil design addresses this by maintaining a constant elastic force between the bolt head and the mating surface. Unlike flat washers or single-coil washers, the double coil provides a larger deformation range, allowing it to compensate for settlement and relaxation of bolted joints. This results in fewer maintenance intervals, reduced downtime, and enhanced safety for operators.
Furthermore, we offer flexibility in material selection and surface treatment to match your specific environmental conditions. For example, in marine or chemical processing applications, a Dacromet coating provides excellent corrosion resistance. For high-temperature settings, we can recommend alternative spring steel grades. Our engineering team is available to assist with custom designs, and we accept small trial orders to validate performance before mass production.
With over 25 years of manufacturing experience, Anping County Boli Hardware Wiremesh Products Factory has established a robust quality management system. We export to more than 15 countries and regions, including North America, Europe, Southeast Asia, and Africa, with annual export value reaching US$5–10 million. Our production capacity is 50 million pieces per year, ensuring timely delivery even for large-scale orders. Each batch is inspected for dimensions, hardness, and surface finish before shipment.
We are confident that our double coil spring washers will meet the rigorous demands of your heavy machinery assembly. To experience the difference in bolt loosening prevention, contact us today for a quote or sample. Our team is ready to support your project with technical data and customized solutions.
Frequently Asked Questions (FAQ)
- What is the difference between a single-coil and a double-coil spring washer? A double-coil spring washer has two concentric coils, offering greater elastic deformation and higher clamping force retention. It is more effective in preventing bolt loosening under severe vibration and dynamic loads.
- What materials are available for your double coil spring washers? We primarily use 65Mn, 60Si2Mn, and 50CrVA spring steel. Other materials such as stainless steel or phosphor bronze can be discussed for special applications.
- Do you offer custom sizes or non-standard dimensions? Yes, we can produce custom sizes according to your drawings or samples. Minimum order quantity may apply for custom items.
- How do I choose the right surface treatment? It depends on the operating environment. Plain finish is economical for indoor use; zinc plating offers moderate corrosion resistance; black oxide provides a dark appearance with some rust protection; Dacromet is recommended for high corrosion resistance in harsh environments.
- What is the typical lead time for standard sizes? For standard sizes (M6–M30) in stock, lead time is 7–15 days. For custom orders, it is usually 15–25 days depending on quantity and complexity.
- Can you provide a sample for testing? Yes, we offer samples for quality evaluation. Please contact our sales team to arrange sample delivery. Sample fees may apply and are refundable for bulk orders.
- How do you ensure the quality of the washers? We follow a strict QC process: incoming material inspection, in-process dimensional checks, hardness testing, and final visual inspection. Each batch is accompanied by a certificate of conformance.
- What is the minimum order quantity (MOQ)? For standard sizes, MOQ is typically 10,000 pieces. For custom sizes, MOQ may be higher. We also accept smaller quantities for trial purposes.
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