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Help CenterBlack Oxide Coated Double Coil Spring Washer M10 DIN 7980 Spring Lock Washer
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Welcome to Anping County Boli Hardware Wiremesh Products Factory – a reliable manufacturer with over 25 years of experience since 1998. Our Black Oxide Coated Double Coil Spring Washer M10 DIN 7980 is engineered to provide superior locking performance in demanding industrial applications. With an annual export value of US$5–10 million and shipping ports including Tianjin, Qingdao, and Shanghai, we serve markets across North America, South America, Europe, and Asia. This product combines the proven DIN 7980 standard with a double coil design, ensuring maximum resilience and vibration resistance. Discover how our washer can enhance your assembly integrity and reduce maintenance costs.
Product Features & Technical Specifications
The Black Oxide Coated Double Coil Spring Washer M10 is manufactured from high-quality spring steel (65Mn or equivalent), then heat-treated and black oxide coated for corrosion resistance and a uniform matte finish. Its double coil structure provides two independent spring forces, offering superior elasticity and locking action compared to standard single-coil washers. Below are the key technical parameters:
| Inner Diameter (d) | 10.5 mm (M10 fit) |
| Outer Diameter (D) | 18.0 mm (approx.) |
| Thickness (t) | 2.0 mm (per coil, total 4.0 mm effective) |
| Material Hardness | 40–48 HRC (after heat treatment) |
| Surface Treatment | Black Oxide (magnetite, Fe3O4) |
| Standard | DIN 7980 (equivalent to ISO 7098) |
| Packing | Bulk or customized packaging (bag, box, pallet) |
Key advantages of the double coil design:
- Enhanced locking force: Two coils provide twice the axial load capacity, preventing loosening under heavy vibration.
- Improved elasticity: The independent coils allow greater deflection without permanent deformation, ensuring long service life.
- Uniform load distribution: The double spring action reduces stress concentration on the bolt head and mating surface.
- Corrosion resistance: Black oxide coating offers a mild protective layer, suitable for indoor and moderate outdoor environments.
- Easy installation: No special tools required – works like a standard spring washer.
- Compliance with DIN 7980: Guarantees dimensional consistency and interchangeability with other standard components.
Benefits to your application:
By using our double coil spring washer, you can reduce the frequency of re-tightening, improve equipment reliability, and lower overall maintenance costs. It is ideal for use in automotive assemblies, agricultural machinery, construction equipment, and any application where secure fastening is critical. The M10 size fits standard metric bolts and is widely used in industrial maintenance and production lines.
Why Choose Anping County Boli Hardware Wiremesh Products Factory?
As a specialized manufacturer founded in 1998, we have accumulated deep expertise in hardware and wire mesh products. Our annual export value of US$5–10 million reflects the trust of global customers. We ship from major Chinese ports (Tianjin, Qingdao, Shanghai, Foshan) and serve diverse markets including North America, South America, Europe, and Southeast Asia. Our production facilities are equipped with advanced heat treatment and coating lines, ensuring consistent quality. Every batch of spring washers undergoes dimensional inspection and hardness testing before shipment.
We are committed to:
- Strict quality control – each washer meets or exceeds DIN 7980 tolerances.
- Competitive pricing – direct factory prices with no middleman.
- Flexible packaging – from small bags to bulk pallets, customized as per your request.
- Timely delivery – efficient logistics network ensures on-time shipment.
- Responsive customer service – professional team answers your inquiries within 24 hours.
Contact us today to request a quotation or sample. Whether you need a standard M10 double coil washer or a customized size, we are ready to support your project. Experience the reliability of a manufacturer with over two decades of industry leadership.
Frequently Asked Questions (FAQ)
-
What is the difference between a double coil spring washer and a single coil one?
A double coil washer has two separate spring coils, providing approximately twice the axial force and better vibration resistance. It is more effective in high-vibration environments compared to single coil types. -
Is this washer compatible with standard M10 bolts?
Yes, the inner diameter is designed for M10 metric bolts (10 mm nominal diameter). It fits standard ISO and DIN threads. -
Can the black oxide coating be used outdoors?
Black oxide offers mild corrosion protection. For outdoor or harsh environments, we recommend additional coatings (e.g., zinc plating) – please contact us for customization. -
What is the maximum operating temperature?
The spring steel material can withstand temperatures up to 120°C (250°F) without losing its elasticity. For higher temperatures, alternative materials are available upon request. -
Do you offer samples before bulk order?
Yes, we provide free samples (buyer pays shipping) for evaluation. Please contact our sales team to arrange. -
What packaging options are available?
Standard packaging includes plastic bags, small boxes, and bulk cartons. Custom packaging (e.g., poly bags with label, palletizing) is available at your request. -
How long is the delivery time?
For stock items, we ship within 3–5 working days. For custom orders, typical lead time is 10–15 days after order confirmation. -
Is this product compliant with RoHS or other environmental standards?
Our black oxide process is environmentally friendly and meets RoHS requirements. Certificates can be provided upon request.
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