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Home > Tools & Hardware > Hardware Accessories > Spring > Double Coil Spring Washer 1 Year Warranty With Mill Test Report

Double Coil Spring Washer 1 Year Warranty With Mill Test Report

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Product Spotlights

Double coil design provides superior anti-loosening and vibration resistance. Backed by 1-year warranty and Mill Test Report for material traceability. Custom sizes, multiple finishes, and global shipping from a trusted manufacturer since 1998.

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

Key Specifications

Get Latest Price

Material:

Other, Carbon Steel, Stainless Steel, Alloy Steel (optional)

Function:

Other, Anti-loosening

Size Range:

M3 to M36 (customizable)

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, Carbon Steel, Stainless Steel, Alloy Steel (optional)

Function Other, Anti-loosening

Size Range M3 to M36 (customizable)

Standard DIN 127B, DIN 7980, ANSI, JIS (optional)

Surface Finish Plain, Zinc Plated, Hot Dipped Galvanized, Phosphate, Black Oxide

Color Natural metallic, silver, black (depending on finish)

Warranty 1 Year

Mill Test Report Available upon request

Packaging Bulk, Box, Pallet, or as per customer request

As a leading manufacturer with over 20 years of experience, Anping County Boli Hardware Wiremesh Products Factory proudly presents our Double Coil Spring Washer. Designed to provide exceptional anti-loosening performance and long-term reliability, these washers are ideal for demanding applications in automotive, machinery, construction, and industrial equipment. Each batch is supplied with a Mill Test Report to guarantee material integrity, and we back every order with a 1-year warranty for your peace of mind.

Our double coil spring washers are precision-engineered from high-quality spring steel, ensuring consistent spring force and excellent vibration resistance. The unique double coil design offers superior load distribution compared to standard single coil washers, making them the preferred choice for critical bolted joints. Whether you need standard sizes or custom dimensions, we have the capability to meet your requirements.

Parameter	Details
Material Grade	Spring Steel 65Mn, 60Si2Mn, Stainless Steel 304/316
Hardness	HRC 40-50 (depending on material)
Surface Finish Options	Plain, Zinc Plated, Hot Dip Galvanized, Black Oxide, Phosphate
Applicable Standards	DIN 127B, DIN 7980, ANSI B18.21.1, JIS B1251
Size Range (Inner Diameter)	M3 (3.2mm) to M36 (37mm) and custom sizes
Coil Count	Double coil (2 turns)

Key Features & Benefits:

Double Coil Design – Provides twice the spring force of standard washers, significantly reducing the risk of loosening under vibration and dynamic loads.
High-Quality Materials – Manufactured from premium spring steel or stainless steel, ensuring excellent elasticity and fatigue resistance for long service life.
Precision Manufacturing – Each washer is produced with tight tolerances to guarantee proper fit and consistent performance across all fasteners.
Mill Test Report Included – Every shipment comes with a detailed report confirming mechanical properties, chemical composition, and dimensional accuracy.
1-Year Warranty – We stand behind our product quality; if any defect arises within one year, we will replace or refund at no extra cost.
Customizable Options – Available in various sizes, materials, finishes, and packaging to meet OEM or aftermarket specifications.
Wide Application – Suitable for automotive assemblies, heavy machinery, construction structures, electrical panels, and farm equipment.

Technical Advantages: Our double coil spring washers are engineered to provide a higher clamping force and better load distribution than single coil versions. The double coil creates a spring effect that maintains tension even when the bolted joint experiences thermal expansion, vibration, or settling. This reduces the need for frequent retightening and enhances overall safety. The washers are also resistant to corrosion when properly finished, making them suitable for outdoor or humid environments.

Why Choose Anping Boli Hardware? Established in 1998, we have been a trusted manufacturer of wire mesh and hardware products for over two decades. Our annual export value exceeds US$5 million, serving markets across North America, South America, Europe, Asia, Africa, and Oceania. We ship from major ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring timely delivery worldwide. Every order is quality-checked by our experienced team, and we offer flexible packaging and logistics solutions.

We understand that your fastening applications demand reliability. That's why we provide Mill Test Reports with every batch, giving you full traceability and confidence in material performance. Combined with our 1-year warranty, you can purchase with zero risk. Contact us today for a quote, custom sizes, or samples. Let us be your long-term partner in precision fasteners.

Frequently Asked Questions

Q: What is the difference between a double coil spring washer and a single coil?
A: A double coil washer has two spring turns, providing approximately twice the spring force and better locking capability. It is ideal for applications with high vibration or dynamic loads where single coil washers may fail.
Q: Do you provide Mill Test Reports for every order?
A: Yes, we include a Mill Test Report (MTR) with each shipment, detailing chemical composition, mechanical properties, and dimensional checks. This is available upon request for your quality assurance.
Q: What materials are available?
A: We offer carbon steel (e.g., 65Mn, 60Si2Mn), stainless steel (304, 316), and alloy steel. Custom materials are also possible based on your requirements.
Q: Can I get custom sizes or non-standard dimensions?
A: Absolutely. Our factory can produce double coil spring washers in custom inner/outer diameters, thicknesses, and coil counts. Please provide your specifications for a quote.
Q: What surface finishes do you offer?
A: Common finishes include plain (oil coated), zinc plated, hot dip galvanized, black oxide, and phosphate. Each finish provides different levels of corrosion resistance and aesthetics.
Q: How long does the 1-year warranty cover?
A: The warranty covers manufacturing defects such as material failure, improper dimensions, or breakage under normal use. If a defect is found within one year of purchase, we will replace or refund the affected items.
Q: What is the typical lead time for an order?
A: For standard sizes, lead time is usually 7-15 days after order confirmation. Custom orders may take 15-25 days depending on complexity and quantity.
Q: Do you ship to my country? What are the shipping ports?
A: We ship worldwide from Tianjin, Qingdao, Shanghai, and Foshan ports. We have experience exporting to over 20 countries, including the US, Germany, Brazil, Australia, and more. Please contact us for shipping options.