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Home > Tools & Hardware > Hardware Accessories > Spring > Double Coil Spring Washer M8x2.0mm for Heavy Duty Bolts Black Oxide Finish

Double Coil Spring Washer M8x2.0mm for Heavy Duty Bolts Black Oxide Finish

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Product Spotlights

Double coil design provides superior vibration resistance and load distribution for heavy-duty bolting. Precision M8 x 2.0mm size with black oxide finish for corrosion protection. Manufactured by an experienced factory since 1998 with annual export value US$5-10M. Customizable sizes, materials, and packaging available.

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

Key Specifications

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Material:

Other, Spring Steel (Carbon Steel)

Model:

M8 Double Coil Spring Washer

Size:

M8 (8mm inner diameter)

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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 (Carbon Steel)

Model M8 Double Coil Spring Washer

Size M8 (8mm inner diameter)

Thickness 2.0mm

Finish Black Oxide

Type Double Coil

Application Heavy Duty Bolts

Standard DIN 127 / ASME B18.21.1 (optional)

Anping County Boli Hardware Wiremesh Products Factory, with over 25 years of manufacturing excellence since 1998, proudly presents our Double Coil Spring Washer M8x2.0mm – a precision-engineered fastening solution designed for heavy-duty bolting applications. This washer features a robust double coil design that provides superior spring tension and vibration resistance, ensuring your bolted joints remain secure under extreme loads. The black oxide finish not only enhances corrosion resistance but also gives a professional, non-reflective appearance. As a trusted manufacturer exporting to global markets, we guarantee consistent quality and dimensional accuracy.

Product Features and Benefits:

Double Coil Construction: Two concentric coils distribute load evenly, preventing loosening from shock and vibration – ideal for heavy machinery, automotive, and structural applications.
Precision M8 Inner Diameter (8.0mm): Fits standard M8 bolts with a snug fit, minimizing lateral movement.
2.0mm Thickness: Provides ample spring force without occupying excessive space, suitable for tight assemblies.
Black Oxide Finish: Offers moderate corrosion protection and reduces friction during installation. It also helps with visual inspection of wear.
Spring Steel Material: High carbon spring steel (e.g., 65Mn) ensures excellent elasticity and fatigue resistance, maintaining tension over time.
Uniform Hardness: Heat-treated to achieve optimal hardness (HRC 40-50) for consistent performance under repeated loading.
Heavy Duty Grade: Designed for bolts under high clamp loads, meeting or exceeding common industry standards (DIN 127, ASME B18.21.1).
Customizable Options: Available in various sizes, materials (stainless steel, zinc-plated), and packaging upon request.

Technical Specifications:

Parameter	Value
Inner Diameter	8.0 mm (M8)
Outer Diameter	16.0 mm (approx.)
Thickness (free height)	2.0 mm
Material	Spring Steel (65Mn, 60Si2Mn or equivalent)
Finish	Black Oxide
Hardness	HRC 40-50
Packing	Bulk, bag, box, or as per customer request

Why Choose Anping Boli Hardware?

Manufacturer Since 1998: Over two decades of experience in producing high-quality fasteners and wire mesh products.
Global Export Capacity: Annual export value of US$5 million to US$10 million, serving markets across North America, South America, Europe, Southeast Asia, Africa, and more.
Flexible Shipping: Convenient access to ports Tianjin, Qingdao, Shanghai, and Foshan ensures timely delivery worldwide.
Customization Available: We can adjust dimensions, materials, finishes, and packaging to meet your specific requirements.
Quality Control: Each batch undergoes dimensional and hardness checks to ensure conformity to specifications.

Our Double Coil Spring Washer is the reliable choice for heavy-duty bolting – from mining equipment and agricultural machinery to construction and automotive assemblies. With our proven track record and commitment to customer satisfaction, you can trust Anping Boli Hardware to deliver fasteners that perform.

Ready to secure your heavy-duty applications? Contact us today for a quote or sample. We are your professional partner in fastener solutions!

Frequently Asked Questions (FAQ)

What is the difference between a double coil spring washer and a single coil?
Double coil washers provide higher spring force and better vibration resistance, making them suitable for heavy-duty applications where single coil washers may not suffice.
Does this washer fit standard M8 bolts?
Yes, the inner diameter is 8.0mm, designed to fit M8 bolts (thread size 8mm) with a clearance fit.
Is the black oxide finish rust-proof?
Black oxide provides a moderate level of corrosion resistance (typically 24-72 hours salt spray). For outdoor or harsh environments, consider zinc-plated or stainless steel options.
Can I get this washer in other sizes or materials?
Absolutely. We offer customization – sizes from M3 to M30, materials like stainless steel (304, 316), and different finishes. Contact us with your requirements.
What is the maximum load this washer can handle?
Load capacity depends on bolt grade and assembly. The washer ensures proper clamp load retention; our spring steel material can withstand dynamic loads typical in heavy machinery.
How should I store these washers?
Store in a dry environment to prevent surface rust. The black oxide finish can be affected by moisture; using oil or desiccant is recommended for long-term storage.
Do you provide samples before bulk order?
Yes, we offer samples for quality evaluation. Sample cost and shipping can be discussed with our sales team.
What packaging options are available?
Standard packaging in poly bags, 小盒, or bulk. Custom packaging with your logo is available upon request.