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As a professional manufacturer with over 25 years of experience, Anping County Boli Hardware Wiremesh Products Factory (established 1998) proudly presents our Double Coil Spring Washers — a premium solution for reliable locking and anti-loosening in demanding applications. Every single washer undergoes 100% inspection to ensure strict compliance with international standards, giving you consistent performance and peace of mind. Our factory, located in Hengshui, Hebei, China, exports annually over US$5–10 million worth of hardware products to markets across North America, South America, Europe, Asia, Africa, and Oceania, serving industries from automotive to heavy machinery.
The unique double coil design provides superior spring action and locking force compared to standard single coil washers. Made from high-quality spring steel or stainless steel, these washers effectively prevent fasteners from loosening under vibration, shock, and thermal cycling. They are available in a wide range of sizes (M3–M30) and surface finishes (plain, zinc plated, black oxide, phosphate) to meet your specific requirements. Each batch is produced in accordance with DIN127, GB/T 93, and ASME B18.21.1 standards, ensuring dimensional accuracy and reliable performance.
Key Features & Technical Specifications:
- Double Coil Design — Provides higher spring rate and better locking effect than single coil washers. The two coils work together to maintain constant tension on the bolt.
- 100% Inspection Passed — Every washer is individually checked for dimensional accuracy, material hardness, and surface finish. This ensures zero defects and consistent quality.
- Standard Compliant — Manufactured strictly to DIN127, GB/T 93, and ASME B18.21.1 specifications. Custom standards available upon request.
- Versatile Material Options — Available in carbon steel (grade 65Mn/60Si2Mn), stainless steel (304, 316), and spring steel. Each material offers excellent elasticity and corrosion resistance.
- Wide Size Range — From M3 to M30, with inner diameters from 3.2mm to 32mm. Non-standard sizes can be customized.
- Surface Finishes — Choose from plain, zinc plated (blue/white/yellow), black oxide, phosphated, or Dacromet coating for enhanced corrosion protection.
- Reliable Locking Performance — The spring action of the double coil creates a strong axial force, preventing loosening even under extreme vibration and thermal expansion.
Technical Specifications Table (Standard Range):
| Specification | Value |
| Material Hardness (HRC) | 38–50 (carbon steel) / 35–45 (stainless steel) |
| Tensile Strength (MPa) | ≥ 1000 (carbon steel) / ≥ 700 (stainless steel) |
| Free Height Tolerance | ±0.2mm (per DIN127) |
| Coil Thickness | 0.5mm – 4.0mm (depending on size) |
| Surface Coating Thickness | 5–12 μm (zinc plated) / 2–5 μm (phosphate) |
| Packaging | 25kg/box, 50kg/carton, 1000kg/pallet (customizable) |
| Inspection Rate | 100% dimensional and visual inspection |
Benefits for Your Business:
- Reduce Assembly Failures — The double coil ensures fasteners stay tight, minimizing maintenance and rework costs.
- Longer Product Life — Superior corrosion resistance and fatigue strength extend the service life of your equipment.
- Global Compliance — Our washers meet international standards, so you can confidently use them in exports or OEM applications.
- Cost Efficiency — Direct factory pricing with competitive bulk discounts. No middlemen.
- Customization Available — Need a specific size, material, or finish? We can tailor the product to your exact requirements.
Since 1998, Anping County Boli Hardware Wiremesh Products Factory has been a trusted manufacturer in the hardware industry. With an annual export value of US$5–10 million, we serve clients in over 15 major markets worldwide. Our production capacity exceeds 500 tons per month, and we maintain strict quality control from raw material sourcing to final packaging. We ship from multiple ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring fast and flexible logistics. Each order is backed by professional after-sales support and a commitment to on-time delivery. Choose our Double Coil Spring Washers for a reliable, standard-compliant locking solution that you can trust. Contact us today for a quote or sample!
Frequently Asked Questions
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Q: What is the difference between double coil and single coil spring washers?
A: Double coil spring washers use two overlapping coils, providing higher spring force and better locking ability compared to single coil. They are ideal for applications with high vibration or dynamic loads. -
Q: Are your washers interchangeable with standard DIN127 washers?
A: Yes, our double coil spring washers are manufactured to DIN127, GB/T 93, and ASME B18.21.1 standards, so they are fully interchangeable with standard spring washers of the same size. -
Q: Do you offer custom sizes or materials?
A: Absolutely. We can produce non-standard sizes, different materials (e.g., Inconel, brass), and special surface treatments. Please provide your drawing or specifications. -
Q: What is the minimum order quantity (MOQ)?
A: For standard sizes, MOQ is typically 10,000 pcs. For custom items, MOQ depends on complexity. Small trial orders are welcome. -
Q: How do you ensure 100% inspection?
A: Each washer passes through automatic optical inspection and manual checking for dimensions, hardness, and surface defects. A test report is provided with each shipment. -
Q: What is the lead time for a typical order?
A: For standard products, lead time is 15–20 days after order confirmation. Custom orders take 25–35 days depending on complexity. -
Q: Can I get a sample before placing a bulk order?
A: Yes, we offer free samples for standard sizes. You only pay shipping costs. Please contact our sales team.
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