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Help CenterDouble Coil Spring Washer Used In Heavy Machinery Bolting To Prevent Loosening
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As a professional manufacturer established in 1998, Anping County Boli Hardware Wiremesh Products Factory specializes in high-quality fastening components. Our Double Coil Spring Washer is engineered specifically for heavy machinery bolting applications, providing reliable anti-loosening performance under extreme vibration and dynamic loads. With over two decades of export experience and an annual export value of US$5 million to US$10 million, we deliver products trusted by customers across North America, South America, Europe, Asia, and Africa.
This washer features a unique double coil design that generates greater spring force compared to standard single-coil washers, ensuring bolts remain securely tightened even in the most demanding environments. Available in various materials, sizes, and surface finishes, our product is customizable to meet specific OEM requirements. Whether used in mining equipment, construction machinery, or agricultural machinery, our double coil spring washer effectively prevents loosening caused by vibration, thermal expansion, and shock loads.
Key Features & Technical Specifications
- Double Coil Structure – Provides twice the clamping force of standard spring washers, ensuring superior locking performance.
- High-Quality Spring Steel – Made from 65Mn or 60Si2Mn steel with consistent hardness (HRC 40-50) for long-term elasticity.
- Corrosion Resistance Options – Available in plain, zinc-plated, hot-dip galvanized, or Dacromet coating to suit different environments.
- Wide Size Range – From M6 to M30, with custom sizes available upon request for non-standard applications.
- Easy Installation – No special tools required; can be used with standard hex bolts and nuts.
- Compliance with Standards – Manufactured according to DIN 127, DIN 7980, or equivalent international standards (certification available upon request).
- Cost-Effective – Durable design reduces maintenance frequency and replacement costs.
| Parameter | Value/Options |
|---|---|
| Material | Spring Steel (65Mn, 60Si2Mn), Stainless Steel (304, 316) |
| Size Range | M6, M8, M10, M12, M16, M20, M24, M30 (or custom) |
| Hardness | HRC 40–50 (as per DIN 127) |
| Surface Finish | Plain, Zinc Plated, HDG, Dacromet, Black Oxide |
| Packing | Bulk in cartons, plastic bags, or custom packaging |
| Applicable Bolts | Hex bolts, structural bolts, flange bolts |
| Standards | DIN 127, DIN 7980, ISO 7095 (available upon request) |
Benefits to Your Operation: By using our double coil spring washer, heavy machinery assemblers and maintenance teams can significantly reduce the risk of bolt loosening, which leads to fewer equipment breakdowns, lower downtime, and enhanced safety. The washer's ability to maintain preload under vibration makes it ideal for crane bolting, excavator track assemblies, press frames, and conveyor systems. Additionally, the corrosion-resistant coating options ensure long service life in outdoor or wet environments.
Trusted by Global Clients
With 25+ years of manufacturing excellence, our factory in Hengshui, Hebei, China, has supplied double coil spring washers to clients in over 20 countries. Our annual export value of US$5–10 million reflects the consistent quality and reliability that our customers depend on. We ship from major ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring timely delivery worldwide. We welcome OEM/ODM inquiries and can provide samples for testing before bulk orders. Contact us today to discuss your specific bolting requirements and experience the difference of a premium anti-loosening solution.
Frequently Asked Questions (FAQ)
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Q: What is the difference between a double coil spring washer and a single coil spring washer?
A: The double coil design provides approximately twice the spring force and deflection range compared to a single coil. This results in better locking performance under heavy vibration and higher load retention, making it ideal for heavy machinery bolting where single coil washers may fail. -
Q: Can this washer be used with stainless steel bolts?
A: Yes, we offer stainless steel double coil spring washers (304 or 316) that are compatible with stainless steel fasteners to prevent galvanic corrosion. Please specify the bolt material when ordering. -
Q: What is the recommended torque for installing bolts with these washers?
A: The torque value depends on the bolt size, grade, and application. We recommend following the bolt manufacturer's torque specifications. The washer does not require special torque settings—it functions as a spring to maintain preload after tightening. -
Q: Are these washers reusable?
A: Generally, spring washers are intended for single-use applications because they may lose some elasticity after being compressed. However, in low-stress or temporary applications, reuse may be possible after inspection. For critical heavy machinery bolting, we recommend using new washers each time. -
Q: Do you provide custom sizes or special coatings?
A: Yes, we can manufacture custom sizes (e.g., M33, M36) and apply special surface treatments such as Dacromet, Geomet, or Teflon coating. Minimum order quantities may apply for custom items. Please contact our sales team with your requirements. -
Q: How do I select the correct size for my bolt?
A: The washer size corresponds to the nominal bolt diameter. For example, use an M12 washer for an M12 bolt. The washer's inner diameter is slightly larger than the bolt diameter to allow easy sliding. If you have a non-standard thread, please provide the bolt diameter and we will recommend the appropriate washer. -
Q: What is the typical lead time for bulk orders?
A: For standard sizes and finishes, lead time is usually 15–25 days after order confirmation. For custom sizes or special coatings, lead time may be 25–35 days. We recommend placing orders in advance to secure production slots. -
Q: Can I get a sample before placing a large order?
A: Yes, we offer free samples for standard sizes (shipping cost to be covered by the customer). Custom samples may incur a small tooling cost. Please contact us to arrange sample delivery.
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