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Anping County Boli Hardware Wiremesh Products Factory has been a trusted manufacturer of fasteners and hardware since 1998. With an annual export value of US$5 million to US$10 million, we supply high-quality components to markets across North America, South America, Europe, Asia, and beyond. Our Double Coil Spring Washer M8 M10 is engineered to deliver superior locking performance in demanding applications. Each washer is backed by a 1-year warranty and a Mill Test Report is available upon request, ensuring full material traceability and compliance with industry standards.
The double coil design provides enhanced spring force and load distribution compared to standard single coil washers. This helps prevent loosening caused by vibration, thermal expansion, or dynamic loads. Made from high-quality spring steel (such as 65Mn or 60Si2Mn), these washers offer excellent elasticity and durability. Available in sizes M8 and M10, with various surface finishes including black oxide, zinc plated, or plain. Below are key technical specifications and benefits.
Key Features & Technical Specifications
- Double Coil Design – Provides twice the spring action of a single coil, ensuring better locking under high vibration.
- Material – Premium spring steel (65Mn, 60Si2Mn, or equivalent) for high yield strength and fatigue resistance.
- Finish Options – Black oxide (oxidized), zinc plated, or plain – all available upon request.
- Precision Dimensions – Manufactured to tight tolerances to ensure proper fit and function with M8 and M10 bolts.
- Mill Test Report – Provided with each shipment for material composition and mechanical properties verification.
- 1-Year Warranty – Covers defects in material and workmanship under normal use.
- Customizable Packaging – bulk, bagged, or boxed according to customer requirements.
| Parameter | M8 | M10 |
|---|---|---|
| Inner Diameter (d) | 8.4 mm | 10.5 mm |
| Outer Diameter (D) | 16 mm | 20 mm |
| Thickness (t) | 1.6 mm | 2.0 mm |
| Coil Count | 2 | 2 |
| Material Hardness | HRC 40-48 | HRC 40-48 |
| Finish | Black Oxide / Zinc / Plain | Black Oxide / Zinc / Plain |
| Warranty | 1 Year | |
Why Choose Our Double Coil Spring Washers?
- Enhanced Locking Performance – The double coil structure generates greater axial force, preventing bolt loosening even under heavy vibration or shock loads.
- Consistent Quality – Our manufacturing process (from raw material selection to heat treatment and finishing) ensures consistent hardness and dimensional accuracy.
- Flexible Finishing Options – Choose from black oxide for corrosion resistance, zinc plating for additional protection, or plain for cost-sensitive applications.
- Traceability and Compliance – Each batch is accompanied by a Mill Test Report, verifying chemical composition and mechanical properties, helping you meet quality assurance requirements.
- Cost-Effective Solution – As a factory-direct manufacturer, we offer competitive pricing without compromising quality. Our annual export value of US$5-10 million demonstrates our scale and reliability.
- Global Shipping Experience – We ship from multiple ports (Tianjin, Qingdao, Shanghai, Foshan) and have experience exporting to 15+ markets worldwide, ensuring smooth logistics.
Our double coil spring washers are widely used in automotive assembly, construction machinery, agricultural equipment, and general industrial fastening applications where reliability is critical. The 1-year warranty gives you peace of mind, and our responsive customer service team can assist with any technical questions or custom requirements.
Trust & Credibility
Since 1998, Anping County Boli Hardware Wiremesh Products Factory has been a dedicated manufacturer serving global clients. With an annual export value of US$5 million – US$10 million, we have established a strong reputation for quality and reliability. Our main markets span North America, South America, Europe, Asia, Africa, and Oceania, reflecting our ability to meet diverse international standards. Each shipment is accompanied by a Mill Test Report and backed by our 1-year warranty. We invite you to experience our factory-direct pricing, flexible customization, and professional service. Contact us today to request a quote or sample – your satisfaction is our priority.
Frequently Asked Questions (FAQ)
-
What is the difference between a double coil spring washer and a single coil?
A double coil washer has two overlapping coils, providing twice the spring force and better resistance to vibration loosening. It is recommended for applications with high dynamic loads or where reliability is critical. -
Are these washers available in other sizes besides M8 and M10?
We primarily stock M8 and M10, but we can manufacture other sizes upon request. Please contact us with your specific requirements. -
What surface finishes do you offer?
We offer black oxide (oxidized), zinc plated, and plain (uncoated) finishes. Other finishes like dacromet or hot-dip galvanizing are available on request. -
Is the Mill Test Report included for every order?
Yes, a Mill Test Report (MTR) is provided with each shipment to verify material composition and mechanical properties. It can be issued in English or Chinese as needed. -
What is the minimum order quantity (MOQ)?
Our MOQ for standard sizes is typically 10,000 pieces per size. For custom orders, MOQ may vary. Please contact us for details. -
Do you provide samples before mass production?
Yes, we offer free samples for evaluation (buyer pays shipping). Samples are usually shipped within 3-5 working days. -
How long is the warranty period, and what does it cover?
We provide a 1-year warranty against defects in material and workmanship under normal use. This does not cover misuse or improper installation. -
Can I get a certificate of compliance?
Yes, we can issue a Certificate of Compliance (COC) along with the Mill Test Report to confirm that the product meets your specified requirements.
For more information or to place an order, please contact our sales team. We look forward to serving you with high-quality double coil spring washers that meet your exact specifications.
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