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Home > Tools & Hardware > Hardware Accessories > Spring > Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening thumbnail-3

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening thumbnail-4

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening thumbnail-5

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening photo-1

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening photo-2

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening photo-3

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening photo-4

Double-layer Spring Washer, Black Oxide Finish, M3-M12, Precision Tolerance 0.01mm, Anti-loosening photo-5

Product Spotlights

Double-layer construction for superior anti-loosening; black oxide finish with corrosion resistance; precision tolerance ±0.01mm ensures consistent fit; available in M3-M12 sizes; manufactured by a trusted factory since 1998 with annual export $5M-$10M; customizable options for dimensions and packaging.

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

Key Specifications

Get Latest Price

Material:

Other, Spring steel (e.g., 65Mn, 60Si2Mn)

Function:

Other, Anti-loosening

Finish:

Black oxide

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 (e.g., 65Mn, 60Si2Mn)

Function Other, Anti-loosening

Finish Black oxide

Size Range M3 to M12

Tolerance ±0.01mm

Type Double-layer spring washer

Application Automotive, machinery, electronics, construction

Packaging Bulk, box, or customized

Welcome to Anping County Boli Hardware Wiremesh Products Factory – a reliable manufacturer with over 25 years of experience in producing precision hardware components. Our Double-layer Spring Washers, featuring a black oxide finish and available in sizes from M3 to M12, are engineered to deliver exceptional anti-loosening performance. With a precision tolerance of 0.01mm, these washers ensure consistent clamping force and reliable assembly in demanding applications. Trust our expertise to provide you with high-quality fastening solutions that meet your exact specifications.

Product Features & Technical Specifications

Double-layer Design: Two interlocking layers provide enhanced spring action and superior resistance to loosening under vibration and dynamic loads.
Black Oxide Finish: Offers corrosion resistance, reduces friction, and provides a uniform dark appearance. Ideal for environments where mild corrosion protection is needed.
Precision Tolerance ±0.01mm: Ensures consistent dimensions for reliable fit and performance in critical assemblies.
Size Range M3 – M12: Covers a wide variety of bolt diameters, suitable for both small and medium-sized fastening applications.
High-grade Spring Steel: Manufactured from premium spring steel (e.g., 65Mn, 60Si2Mn) for excellent elasticity and fatigue resistance.
Anti-loosening Performance: The double-layer structure creates a locking effect that prevents nuts and bolts from loosening due to vibration or thermal cycling.
Easy Installation: No special tools required; can be used with standard washers and fasteners.

Technical Parameters

Parameter	Specification
Material	Spring steel (65Mn, 60Si2Mn, or equivalent)
Surface Finish	Black oxide
Tolerance	±0.01mm on inner/outer diameter and thickness
Size Range	M3, M4, M5, M6, M8, M10, M12
Hardness	HRC 40-50 (dependent on material)
Packing	Bulk (1000 pcs/bag), box, or customized per request

Advantages & Customer Benefits

Reliable Anti-loosening: The double-layer spring design maintains constant tension, significantly reducing the risk of fastener failure in high-vibration applications such as automotive engines, industrial machinery, and electronic enclosures.
Cost-effective Solution: Compared to complex locking mechanisms, our washers offer a simple, low-cost way to improve assembly reliability.
Consistent Quality: With a tolerance of 0.01mm, each washer provides repeatable performance, reducing assembly line rejects and rework.
Versatile Usage: Suitable for applications in automotive, construction, agricultural equipment, furniture, and more.
Customizable Options: We can adjust dimensions, materials, and packaging to meet your specific requirements. Contact us for custom sizes beyond M3-M12.

Why Choose Anping County Boli Hardware Wiremesh Products Factory?

Since 1998, we have been a dedicated manufacturer in the hardware industry. Our annual export value of US$5 Million – US$10 Million reflects strong global demand for our products. We ship from major Chinese ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring efficient logistics to markets across North America, South America, Europe, Asia, Africa, and Oceania. Our team of experienced engineers and workers maintains strict quality control at every stage of production. We are committed to providing you with high-performance fasteners that meet your exact specifications. Whether you need a standard M6 double-layer spring washer or a custom batch, we are ready to serve you with professionalism and dedication.

Take the next step – contact us today for a quote or to discuss your project requirements. Our knowledgeable sales team will respond within 24 hours. Experience the reliability and precision that has made Boli a trusted name in the global hardware market.

Frequently Asked Questions (FAQ)

What is the difference between a double-layer spring washer and a standard single-layer washer?
A double-layer spring washer has two interlocking layers that provide more spring force and better locking ability. It is especially effective in preventing loosening caused by vibration, whereas a single-layer washer offers less resistance.
Can I use these washers outdoors or in wet environments?
The black oxide finish provides moderate corrosion resistance. For outdoor or highly corrosive environments, we recommend additional plating (e.g., zinc or stainless steel) – please contact us for custom options.
What bolt sizes are compatible with M3-M12 washers?
Each washer is designed to match the corresponding bolt diameter. For example, an M6 washer fits an M6 bolt. The inner diameter tolerance of ±0.01mm ensures a snug fit without excessive play.
Do you offer washers in sizes outside M3-M12?
Yes, we can produce custom sizes upon request. Please provide your required dimensions and quantity for a quotation.
How are these washers packaged?
Standard packaging is bulk in polyethylene bags, typically 1000 pieces per bag for small sizes. We also offer box packaging, shrink-wrapped trays, or customized labeling as per your instructions.
What is the lead time for an order?
For standard sizes and quantities, lead time is usually 7-15 days after order confirmation. For custom orders, additional time may be required. We will provide a specific timeline upon inquiry.
Do you provide samples before bulk order?
Yes, we can provide samples for evaluation. Sample cost and shipping are negotiable. Please contact our sales team to arrange sample delivery.
Is there a minimum order quantity (MOQ)?
For standard sizes, the MOQ is typically 10,000 pieces per size, but we can discuss smaller quantities for trial orders. Contact us for flexible terms.