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Welcome to Anping County Boli Hardware Wiremesh Products Factory – a trusted manufacturer since 1998 specializing in precision fastening components. Our Double Coil Spring Washer for Industrial Machinery Fastening Bolt Preload Retention is engineered to deliver superior bolt preload maintenance under high vibration and dynamic loads. With over 20 years of experience and an annual export value of US$5–10 million, we supply reliable locking solutions to markets across North America, South America, Europe, Asia, Africa, and Oceania. This product is a core component in ensuring the long-term integrity of bolted joints in heavy machinery.
Why choose our Double Coil Spring Washer? Unlike standard single coil washers, the double coil design provides two independent spring coils that work together to maintain consistent clamping force, compensating for bolt relaxation and thermal expansion. This ensures that your bolted assemblies remain tight and secure even in the most demanding industrial environments. Below, we dive into the technical specifications, performance advantages, and real-world benefits.
Product Features & Technical Specifications
- Double Coil Structure: Two concentric coils provide redundant spring force, increasing preload retention by up to 30% compared to single coil washers.
- Material Options: Available in carbon steel (S45C, 60Si2Mn), stainless steel (304, 316), and alloy steel (for high-temperature applications).
- Hardness Range: HRC 38–48, ensuring excellent elasticity without embrittlement.
- Surface Treatments: Plain, zinc plated (passivated), black oxide, hot-dip galvanized, or Dacromet – all offering corrosion resistance for indoor or outdoor use.
- Size Range: From M3 to M30 (metric), with custom diameters and thicknesses available upon request.
- Compliance: Manufactured according to DIN 127, ASME B18.21.1, and GB/T 94.1 standards (quality systems maintained but not certified).
- Load Capacity: Each washer can sustain preload up to 80% of the bolt’s yield strength, depending on material and size.
| Parameter | Value | Notes |
|---|---|---|
| Material | Carbon Steel (S45C) | Standard grade; stainless available |
| Hardness | HRC 40–45 | Customizable within HRC 38–48 |
| Outer Diameter (M10) | 20 mm | Varies by bolt size |
| Free Height (M10) | 3.5 mm | Compressed height ~2.2 mm |
| Spring Rate | ~800 N/mm | Double coil effect doubles stiffness |
| Operating Temperature | -40°C to +150°C | Higher for alloy steel versions |
Key Benefits for Your Application
- Eliminates Bolt Loosening: The double coil design maintains constant pressure, preventing self-loosening caused by vibration, shock, or thermal cycling.
- Extends Maintenance Intervals: With preload retention, you reduce the need for frequent re-tightening, saving labor and downtime.
- Improves Joint Reliability: Consistent clamping force reduces the risk of fatigue failure in bolted connections.
- Easy Installation: No special tools required – simply place under the bolt head or nut like a standard washer.
- Versatile Compatibility: Works with hex bolts, studs, flange nuts, and most industrial fasteners.
- Cost-Effective: Compared to thread-locking adhesives or nylon insert nuts, our washers are reusable and more economical for large-scale assemblies.
Our double coil spring washers have been tested in applications such as press machines, conveyor systems, agricultural equipment, construction machinery, and automotive chassis. In every case, they outperform standard spring washers in maintaining bolt preload over time.
Trusted by Global Industries
Anping County Boli Hardware Wiremesh Products Factory has been a reliable partner for industrial buyers since 1998. With an annual export turnover of US$5–10 million, we consistently deliver high-quality fastening components to more than 15 countries worldwide. Our production facility in Hengshui, Hebei, China, is equipped with advanced cold-forming and heat-treatment lines, ensuring each washer meets strict dimensional and hardness tolerances. We offer flexible shipping from Tianjin, Qingdao, Shanghai, Foshan ports, and can handle both small sample orders and full container loads.
Why buy from us? We are a manufacturer, not a middleman – you get factory-direct pricing, faster lead times, and direct customization. Our experienced engineering team can assist with selecting the optimal material, finish, and size for your specific preload requirements. We also provide free samples for evaluation (subject to freight charges).
Contact us today to request a quote or discuss your industrial fastening challenges. Let us help you keep your machinery running safely and efficiently with our double coil spring washers.
Frequently Asked Questions (FAQ)
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Q: What is the main difference between a double coil spring washer and a single coil?
A: The double coil washer provides two independent spring coils, which offer higher spring force and better preload retention under vibration. It is specifically designed for applications where bolt loosening is a critical concern. -
Q: Can these washers be reused after disassembly?
A: Yes, double coil spring washers are reusable as long as they are not permanently deformed. However, we recommend inspecting them for any plastic deformation or cracks before reinstallation. For critical joints, we suggest using new washers. -
Q: What materials are available for corrosive environments?
A: We offer stainless steel grades 304 and 316, as well as carbon steel with zinc plating, black oxide, or hot-dip galvanizing. For saltwater or chemical exposure, 316 stainless steel is recommended. -
Q: Do you provide custom sizes or non-standard dimensions?
A: Absolutely. We can manufacture washers with custom inner/outer diameters, thickness, and coil height to match your specific bolt and application requirements. Please provide your drawing or specifications. -
Q: How should I choose the correct size for my bolt?
A: The washer’s inner diameter should match the bolt’s nominal diameter (e.g., M10 bolt uses M10 washer). The outer diameter and thickness are determined by the load and space constraints. Refer to our size chart or consult our technical team. -
Q: Is there a minimum order quantity (MOQ)?
A: For standard sizes, our MOQ is 1,000 pieces per size. For custom sizes, MOQ may be higher. We also accept sample orders of 50–100 pieces for testing. -
Q: Do you have any quality certifications?
A: We maintain internal quality control procedures and have passed factory audits from many clients. Specific certifications such as ISO 9001 are not yet held, but we can provide material test reports and dimensional inspection reports upon request. -
Q: What is the typical lead time?
A: For standard sizes, lead time is 7–15 days after order confirmation. Custom orders take 15–25 days depending on complexity. Expedited shipping is available for urgent orders.
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