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Home > Tools & Hardware > Hardware Accessories > Spring > Double-layer Spring Washer, Hot Dip Galvanized, M12-M36, for Heavy Duty Fastening in Construction

Double-layer Spring Washer, Hot Dip Galvanized, M12-M36, for Heavy Duty Fastening in Construction

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Double-layer Spring Washer, Hot Dip Galvanized, M12-M36, for Heavy Duty Fastening in Construction photo-4

Double-layer Spring Washer, Hot Dip Galvanized, M12-M36, for Heavy Duty Fastening in Construction photo-5

Product Spotlights

Double-layer design provides up to 30% more clamping force than single spring washers, preventing loosening under heavy vibration. Hot dip galvanized coating offers exceptional corrosion resistance, ideal for outdoor construction and harsh environments. Available in M12 to M36 sizes, manufactured by a trusted exporter with 25+ years of experience.

Negotiable MOQ: 1 Piece (Price negotiable depending on order volume and customization)

Key Specifications

Get Latest Price

Material:

Other, Spring Steel (Hot Dip Galvanized)

Type:

Double-layer Spring Washer

Surface Treatment:

Hot Dip Galvanized

Contact Supplier Request Quote Chat Now

Anping County Boli Hardware Wiremesh Products Factory

2Yrs

Payment & Shipping

Payment Methods:

Port of Shipment:

tianjin shanghai qingdao

Delivery Detail:

Delivery time depends on order quantity.

Product Details
Company Profile
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Material Other, Spring Steel (Hot Dip Galvanized)

Type Double-layer Spring Washer

Surface Treatment Hot Dip Galvanized

Size Range M12 to M36

Application Heavy Duty Fastening in Construction

Configuration Double-layer, Split or Curved

Packaging Bulk packing or custom packaging upon request

Standard Compliant with industry standards (e.g., DIN, ASME available upon request)

Anping County Boli Hardware Wiremesh Products Factory, established in 1998, is a professional manufacturer specializing in high-quality fasteners and wire mesh products. With annual export value between US$5 million and US$10 million, we serve markets across North America, South America, Europe, Southeast Asia, Africa, and Oceania. Our Double-layer Spring Washer, Hot Dip Galvanized, in sizes M12 to M36, is designed for heavy-duty fastening applications in construction, offering superior anti-loosening performance and exceptional corrosion resistance. Backed by decades of manufacturing experience, our products deliver reliability and durability that meet the rigorous demands of global construction projects.

Product Features & Advantages

Double-layer Design: The unique double-layer structure provides increased spring force and friction, effectively preventing fastener loosening under vibration and dynamic loads—ideal for heavy-duty construction equipment, steel structures, and bridges.
Hot Dip Galvanized Coating: A thick zinc layer (typically 50-80 µm) offers superior protection against rust and corrosion, even in harsh outdoor or marine environments, extending service life significantly compared to standard electroplated washers.
Wide Size Range (M12 – M36): Covers most common bolt sizes for structural and heavy machinery fastening, reducing the need for multiple inventory items.
High Load Capacity: Manufactured from premium spring steel, heat-treated for elasticity and hardness, ensuring consistent clamping force over extended periods.
Easy Installation: Standard split-ring or curved design allows quick assembly without special tools, compatible with standard nuts and bolts.
Customizable Options: Available in various dimensions, packaging, and tolerances to meet specific project requirements.

Technical Specifications

Size (Thread Diameter)	Inner Diameter (mm)	Outer Diameter (mm)	Thickness (mm)	Material Hardness (HRC)
M12	12.2	24.0	3.0	40-48
M16	16.2	30.0	3.5	40-48
M20	20.2	37.0	4.0	40-48
M24	24.5	44.0	4.5	40-48
M30	30.5	56.0	5.5	40-48
M36	36.5	66.0	6.5	40-48

Note: Dimensions are typical values; actual specifications may vary. Custom sizes are available upon request.

Benefits for Your Projects

Enhanced Safety: The double-layer spring washer maintains bolt tension even under extreme vibration, reducing the risk of structural failure in buildings, bridges, and heavy machinery.
Long-term Cost Savings: Hot dip galvanized coating eliminates the need for frequent replacement due to corrosion, lowering maintenance costs over the lifespan of the structure.
Reliable Performance in Harsh Environments: Suitable for outdoor construction, coastal areas, chemical plants, and other corrosive settings where standard washers fail quickly.
Compatibility with Standard Fasteners: Works seamlessly with metric hex bolts and nuts, simplifying procurement and inventory management.
Global Shipping Convenience: We ship from major Chinese ports (Tianjin, Qingdao, Shanghai, Foshan) with flexible logistics options to meet your delivery schedule.

Trust & Reliability

As a manufacturer with over 25 years of experience, Anping County Boli Hardware Wiremesh Products Factory has supplied millions of washers to customers worldwide. Our double-layer spring washers undergo strict quality control—from raw material inspection to final packaging—ensuring consistent dimensions, hardness, and coating thickness. We have served diverse markets including North America, Europe, Southeast Asia, Africa, and Oceania, earning recognition for product quality and on-time delivery. With an annual export value of US$5-10 million, we are a trusted partner for construction companies, contractors, and distributors. Contact us today to request a quote or sample—let our expertise support your next heavy-duty fastening project.

Frequently Asked Questions

Q: What is the difference between a double-layer spring washer and a standard single spring washer?
A: A double-layer spring washer consists of two layers stacked together, providing higher spring force and better resistance to loosening under vibration compared to a single-layer washer. It is particularly effective for heavy-duty applications where bolt preload retention is critical.
Q: How does hot dip galvanizing compare to electroplating for spring washers?
A: Hot dip galvanizing provides a much thicker zinc coating (typically 50-80 µm) than electroplating (5-15 µm), offering superior corrosion protection, especially in outdoor or marine environments. However, electroplating provides a smoother finish and is more suitable for precision applications. Our washers are hot dip galvanized to ensure long service life in construction.
Q: Are these washers compatible with standard M12 to M36 bolts?
A: Yes, they are designed to fit standard metric hex bolts and nuts within the specified size range. The inner diameter is slightly larger than the bolt thread diameter to allow easy assembly while providing a snug fit.
Q: Can I get custom sizes outside M12-M36?
A: Yes, we offer customization for sizes beyond the standard range, as well as variations in thickness, material hardness, and coating. Please contact us with your specific requirements.
Q: What is the typical lead time for orders?
A: For standard sizes, lead time is usually 15-25 days after order confirmation, depending on quantity. Custom orders may require additional time. We can provide a precise schedule upon request.
Q: Do you have any certifications or quality guarantees?
A: While we do not claim specific certifications not mentioned in our profile, we follow strict internal quality control procedures and can provide material test reports and dimensional inspection data upon request. Our products are manufactured to meet common industry standards (e.g., DIN, ASME) as per customer specifications.
Q: Is the coating uniform and free of defects?
A: Yes, our hot dip galvanizing process ensures a uniform, adherent coating with minimal dripping or bare spots. Each washer is visually inspected. In case of any defects, we offer replacement or rework.
Q: How are the washers packaged for export?
A: Standard packaging is in bulk cartons or steel drums, with inner plastic bags. Custom packaging (e.g., small boxes, polybags, or palletizing) is available upon request. We can also provide neutral packaging or branding as needed.