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Premium Flat Steel Washers &
Hardened Steel Fasteners

Manufactured by Suzhou YNK Fastener Co., Ltd. – ISO-certified producer of high-tensile, structural, galvanized, and non-standard washers for industrial, construction, and infrastructure applications worldwide.

Who We Are

Suzhou YNK Fastener Co., Ltd. (formerly Wuxian Fasteners) is a leading Chinese manufacturer of industrial washers and fasteners, established in 1988. Located in the northern suburb of Suzhou, Jiangsu Province, our facility spans over 55,000 square meters and employs more than 330 skilled professionals.

With an annual production capacity exceeding 28,000 tons, we specialize in high-quality flat steel washers, hardened steel washers, structural washers, and custom non-standard components. Our technical expertise and commitment to integrity have made us a trusted supplier across global markets.

  • ISO-Certified Manufacturing Standards
  • 35+ Years of Industry Experience
  • Exported to Over 50 Countries
  • Full In-House Quality Control & Testing
DIN6916 Plain Washer Non-Standard Washer Hot Dip Galvanized Washer DIN9021 Plain Washer

Our Premium Washer Products

Explore our comprehensive range of high-performance flat steel washers, hardened washers, structural components, and specialty fasteners engineered for durability, precision, and compliance with international standards.

SAE Washer Black Oxide

SAE Washer / Flat Steel Washer

  • Size: 1/4" - 3"
  • Material: S45C / 40CR
  • Finish: Black Oxide
  • Standard: SAE
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DIN9021 Heavy Washer

DIN9021 Washer / High Tensile Washer

  • Size: M6 - M100
  • Material: S45C / 40CR
  • Finish: Plain / Dacromet
  • Standard: DIN 9021
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DIN6916 Washer

DIN6916 Washer / Plain Washer

  • Size: M12 - M36
  • Material: S45C / 40CR
  • Finish: Black Oxide
  • Standard: DIN 6916
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DIN9021 Plain Washer

DIN9021 Plain Washer

  • Size: M6 - M100
  • Material: S45C / 40CR
  • Finish: Plain / Dacromet
  • Application: Heavy Duty Industrial Use
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F436M HDG Washer

F436M Hot Dip Galvanized Washer

  • Size: M12 - M100
  • Material: S45C / 40CR
  • Finish: HDG (Hot Dip Galvanized)
  • Standard: ASTM F436M
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Non-Standard Washer

Non-Standard Washers

  • Custom Sizes: Available on Request
  • Material: 304 Stainless Steel, S45C
  • Finish: Plain, Dacromet, Zinc Plated
  • Use: Infrastructure, Special Projects
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Hardened Steel Washer

Hardened Steel Washers

  • Hardness: HRC35+ (Black Oxide Fender)
  • Standards: SAE, DIN6916, F436M
  • Finishes: Zinc Plated, Black Oxide, HDG
  • Applications: Structural & High-Tensile
View Details →
Structural Steel Washer

Structural Steel Washers

  • Standards: EN14399-6, SAE, USS
  • Sizes: M12-M36, 1/4" - 3"
  • Finishes: Black Oxide, Zinc Plated, Dacromet
  • Material: High Tensile S45C/40CR
View Details →

Why Choose Our Washers?

Engineered for performance, durability, and global compliance.

ISO-Certified Quality

Manufactured under strict ISO standards with full traceability and testing.

Multiple Standards

Compliant with SAE, DIN, EN, ASTM, and USS specifications.

Global Export Ready

Trusted by clients in over 50 countries with reliable logistics.

Custom Solutions

Non-standard sizes and finishes available for specialized projects.

35+
Years in Business
28,000+
Tons Annual Output
55,000
m² Factory Area
330+
Skilled Employees

Frequently Asked Questions

What materials are used in your flat steel washers?

Our washers are primarily made from high-quality carbon steel materials such as S45C and 40Cr, ensuring strength and durability for industrial applications.

Do you offer customized washer sizes?

Yes, we specialize in non-standard and custom-sized washers for infrastructure and special engineering projects. Please contact us with your specifications.

What surface finishes do you provide?

We offer black oxide, zinc plating, hot dip galvanizing (HDG), and Dacromet finishes to meet corrosion resistance and performance requirements.

Are your products compliant with international standards?

Yes, our washers meet SAE, DIN, EN, ASTM, and USS standards, including DIN6916, DIN9021, EN14399-6, and F436M specifications.

Can I request a sample before placing an order?

Yes, we provide samples upon request. Visit the official website to submit your sample inquiry with detailed requirements.

Get in Touch

For quotes, samples, or technical inquiries, please visit our official website to connect with our sales team.

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