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Help CenterDouble-layer Spring Washer for Automotive Engine Assembly, Anti-loosening, M8-M14, Carbon Steel
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Anping County Boli Hardware Wiremesh Products Factory, established in 1998 with over 25 years of manufacturing expertise, proudly presents the Double-layer Spring Washer for Automotive Engine Assembly. This specialized anti-loosening washer is engineered to withstand extreme vibrations and dynamic loads in engine compartments, ensuring reliable fastening in critical applications. Our factory, with an annual export value exceeding US$5 million, supplies to global markets including North America, Europe, and Southeast Asia, delivering consistent quality and precision that automotive manufacturers and tier-1 suppliers demand.
Designed for M8 to M14 bolt sizes, our double-layer spring washer combines two interlocking spring steel layers to provide superior elastic recovery and clamping force retention. Unlike standard single-layer washers, the unique double-layer structure creates a mechanical lock that resists rotation and loosening even under severe vibration, thermal cycling, and high torque conditions. This makes it an ideal choice for engine assembly, where fasteners must remain secure for the lifespan of the vehicle.
Key Features & Technical Specifications
- Material: High-quality carbon steel (65Mn, 60Si2Mn, or equivalent) with optional surface treatments such as black oxide, zinc plating, or phosphate coating for corrosion resistance.
- Anti-loosening Performance: The double-layer design provides a spring force that maintains preload, reducing the risk of nut or bolt loosening by up to 50% compared to standard spring washers.
- Precision Tolerance: Manufactured to tight dimensional tolerances (ISO 2768 class m) to ensure consistent fit and performance in automated assembly lines.
- Heat Treatment: Through-hardened to HRC 40-50, offering excellent elasticity and fatigue resistance even under repeated loading.
- Customizable: Available in various finishes, including dacromet, geometric, or zinc-nickel coating, to meet specific OEM corrosion protection requirements.
| Size (M) | Nominal Outer Diameter (mm) | Nominal Inner Diameter (mm) | Thickness per Layer (mm) | Free Height (mm) |
|---|---|---|---|---|
| M8 | 16.0 | 8.4 | 1.6 | 3.2 |
| M10 | 20.0 | 10.5 | 2.0 | 4.0 |
| M12 | 24.0 | 13.0 | 2.5 | 5.0 |
| M14 | 28.0 | 15.0 | 2.5 | 5.5 |
Benefits for Your Assembly Line
- Reduced Rework: The anti-loosening design minimizes fastener failures, saving time and cost in production and after-sales service.
- Consistent Clamping Force: Maintains preload even after thermal expansion/contraction, ensuring engine components stay securely fastened.
- Easy Installation: No special tools required; can be used with standard torque wrenches and automated assembly equipment.
- Long Service Life: Carbon steel construction with optional corrosion protection extends washer life in harsh engine environments (oil, moisture, heat).
Trust & Reliability
With an annual export value of US$5 million to US$10 million and shipments from Tianjin, Qingdao, Shanghai, and Foshan ports, Anping Boli has built a strong reputation among global automotive clients. Our factory is located in Hengshui, Hebei — a major hardware manufacturing hub in China. We serve markets across North America, Europe, South America, Southeast Asia, Africa, Oceania, and the Middle East. Our quality control system ensures each batch of double-layer spring washers is tested for hardness, dimensional accuracy, and spring performance before delivery. We are committed to providing competitive pricing without compromising on quality.
Frequently Asked Questions
- Q: What material is used for these washers? A: The standard material is carbon steel (65Mn), which offers excellent elasticity and strength. We can also supply 60Si2Mn or other alloys upon request.
- Q: How does the double-layer design prevent loosening? A: The two layers are preloaded in opposite directions, creating a spring force that compensates for any small movement or settling of the bolt, thus maintaining clamping force and resisting rotation.
- Q: Are these washers suitable for high-temperature engine environments? A: Yes, the carbon steel material can withstand temperatures up to 200°C continuously. For higher temperatures, we recommend surface treatments like phosphate or dacromet that improve heat resistance.
- Q: Can I get custom sizes outside M8-M14? A: Yes, we offer custom tooling for non-standard sizes. Please contact our sales team with your requirements.
- Q: What surface finishes are available? A: Plain (as-formed), black oxide, zinc plated, phosphate, dacromet, and geometric coating are available. Each finish provides different levels of corrosion protection.
- Q: Do you provide samples for testing? A: Yes, we can provide free samples for qualified customers. Shipping costs may apply for expedited delivery.
- Q: What is the typical lead time for bulk orders? A: For standard sizes, lead time is 15–25 working days after order confirmation, depending on quantity and surface treatment.
- Q: How do you ensure quality consistency? A: We implement in-process inspection and final QC testing including hardness, dimension, and spring load testing. Each batch comes with a test report.
Contact us today to request a quote or discuss your specific engine assembly requirements. Our team is ready to support your production with reliable anti-loosening solutions.
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