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As a leading manufacturer based in Hengshui, Hebei, China, Anping County Boli Hardware Wiremesh Products Factory has been dedicated to producing high-quality fastening components since 1998. Our Double-layer spring washer is designed to offer superior locking performance and vibration resistance, making it an essential component for demanding industrial applications. Each washer undergoes rigorous factory inspection to ensure strict compliance with ISO 9001 quality management standards, giving you reliable performance and peace of mind.
The unique double-layer (two-turn) structure creates a higher spring force and ensures consistent tension even under extreme conditions. This design effectively prevents loosening caused by vibration, thermal expansion, and dynamic loads, extending the service life of your assemblies. With an annual export value of US$5–10 million, our products are trusted by customers across North America, South America, Europe, Asia, Africa, and Oceania.
Below you will find detailed specifications, key features, and answers to frequently asked questions to help you make an informed purchasing decision.
Key Features & Technical Specifications
- Double-layer design – Two complete turns provide enhanced spring action and superior locking force compared to standard single-turn washers.
- ISO 9001 compliant – Manufactured under a quality management system that meets international standards, ensuring consistent product quality.
- Rigorous factory inspection – Every batch is tested for hardness, dimensional accuracy, and spring properties before shipment.
- Wide material selection – Available in carbon steel, stainless steel 304/316, and other alloys upon request.
- Customizable dimensions – We offer standard sizes from M3 to M30, and non-standard sizes can be produced per your drawings or samples.
- Surface treatment options – Plain, zinc plated, yellow passivation, Dacromet, or other coatings to meet corrosion resistance requirements.
- Consistent spring force – The double-turn geometry ensures uniform load distribution and maintains elasticity over time.
- Easy installation – No special tools required; fits standard bolt and nut assemblies.
| Parameter | Details |
|---|---|
| Material | Carbon steel (65Mn, 60Si2Mn), Stainless steel (201, 304, 316) |
| Hardness (HRC) | 40–50 (carbon steel), 35–45 (stainless steel) |
| Surface Treatment | Plain, Zinc plated, Dacromet, Geomet, Phosphate |
| Size Range | M3 – M30 (other sizes available upon request) |
| Packing | Bulk in cartons, poly bags, or palletized as per customer requirement |
| Compliance | ISO 9001:2015 quality management system |
Why Choose Our Double-Layer Spring Washer?
- Enhanced locking performance – The double-turn design provides up to 30% more spring force than standard washers, reducing the risk of loosening in high-vibration environments.
- Cost-effective solution – By preventing fastener failure, you reduce maintenance costs and downtime, delivering long-term savings.
- Global logistics support – Shipping from Tianjin, Qingdao, Shanghai, and Foshan ports ensures timely delivery to your location.
- Decades of experience – Founded in 1998, our factory has over 25 years of expertise in fasteners and wire mesh products.
- Customization flexibility – Whether you need a specific size, material, or surface treatment, we can accommodate your requirements.
Our products are widely used in automotive assembly, heavy machinery, railways, bridges, and electronic equipment. The double-layer spring washer is particularly suitable for applications where safety and reliability are critical, such as in braking systems, engine mounts, and structural connections.
Trust & Reliability
With an annual export value of US$5–10 million, Anping County Boli Hardware Wiremesh Products Factory has built a strong reputation among international buyers. Our main markets span across North America, South America, Europe, Southeast Asia, Africa, the Middle East, and Oceania. We are committed to delivering products that meet the highest standards of quality and precision. Our rigorous factory inspection process ensures that every washer leaving our facility is dimensionally accurate and functionally sound. Partner with us for a reliable supply chain and competitive pricing.
We invite you to contact us for a quote or to request samples. Our experienced team is ready to assist you with technical support and logistics coordination. Choose our double-layer spring washer for a secure and durable fastening solution.
Frequently Asked Questions
Q1: What is the difference between a double-layer spring washer and a standard single-turn washer?
A: A double-layer (two-turn) spring washer provides a higher spring force and better elasticity, which helps maintain clamping force under vibration and dynamic loads. It is generally more effective than a single-turn washer in preventing loosening.
Q2: Are these washers suitable for use with stainless steel bolts to prevent galvanic corrosion?
A: Yes, we offer stainless steel double-layer spring washers that are compatible with stainless steel fasteners. For optimal corrosion resistance, you can also choose appropriate surface treatments such as Dacromet or Geomet.
Q3: What sizes are available, and can you manufacture non-standard sizes?
A: We stock common sizes from M3 to M30. Non-standard sizes and custom dimensions can be produced based on your drawings or samples. Please contact our sales team for details.
Q4: Do you provide samples before bulk order?
A: Yes, we offer free samples for quality evaluation. The customer only needs to cover the shipping cost. Samples are typically produced within 5–7 working days.
Q5: What is the minimum order quantity (MOQ)?
A: For standard sizes, the MOQ is 10,000 pieces per size. For custom sizes, MOQ may vary depending on the complexity. We can discuss flexible terms for trial orders.
Q6: How do you ensure the quality of the spring washers?
A: Our factory operates under an ISO 9001 compliant quality management system. Each production batch undergoes dimensional inspection, hardness testing, and spring force testing. We also conduct random sample checks before shipment.
Q7: What is the typical lead time for bulk orders?
A: For standard sizes, lead time is approximately 15–25 days after order confirmation, depending on quantity. Custom orders may take 25–35 days. We always strive to meet your delivery schedule.
Q8: Can you provide third-party inspection certificates?
A: Yes, we can arrange third-party inspection by SGS, BV, or other agencies upon request. The cost is borne by the buyer or negotiable.
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