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GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
Specifications
Place Of Origin :
ZHEJIANG CHINA
Supply Ability :
500 Tons/month
Standard :
DIN, ANSI, GB, JIS, BSW, GOST
MOQ :
50000
Sample :
Free Samples
Usage :
For Fastening Metal To Metal
Certification :
ISO 9001
Place of Origin :
China
Model Number :
Cross Tapping Screw
Connection :
Common Bolt
Brand Name :
YONGBIAO
Quality :
100% Inspection
Delivery Time :
7-25Days
Price :
Negontiation
Finish :
Zinc Plated
Measurement System :
INCH, Metric
Payment Terms :
T/T
Packaging Details :
Plastic Bag / Paper Box
Description
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
The GB5287 Extra Large Flat Washer (also known as Plain Washer - Extra Large Series - Product Grade C) is a high-quality fastener component manufactured in strict accordance with Chinese National Standard GB/T 5287-2002 (equivalent to ISO 7094:2000). This standard specifies plain washers with nominal sizes (thread major diameters) ranging from 5mm to 36mm, featuring an extra large series design, 100HV hardness grade, and Product Grade C classification.
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
Key Features
  • Extra Large Outer Diameter: Compared to standard flat washers, the GB5287 series features a significantly larger outside diameter, providing a larger bearing surface to effectively distribute load and prevent damage to the fastened structure
  • High Hardness (100HV): Manufactured to 100HV hardness grade, ensuring excellent strength and durability under heavy loads
  • Versatile Material Options: Available in carbon steel, stainless steel (304/316), and alloy steel to meet different environmental and strength requirements
  • Multiple Surface Finishes: Options include plain, zinc plated, black oxide, phosphate, hot-dip galvanized, and Dacromet coatings for enhanced corrosion resistance
Technical Specifications
Measurement System INCH, Metric
Standard DIN, ANSI, GB, JIS, BSW, GOST
Process Cold Forging
Finish Zinc Plated
Load Capacity Medium Duty
Usage For Fastening Metal To Metal
HS Code 7318151001
Customization Services
We offer comprehensive OEM and ODM services to meet your specific requirements:
  • Custom head styles, drive types (Phillips H / Pozidriv Z), and thread designs
  • Special lengths, diameters, and tolerances
  • Specific material grades and surface finishes
  • Custom packaging with your branding (labels, boxes, bags, blister packs)
  • Logo engraving on screw heads
Why Choose Us
  • Professional fastener manufacturer with over 10 years of export experience
  • Advanced automatic cold heading and thread rolling equipment ensuring consistent quality and fast delivery
  • Strict quality control system from raw material sourcing to finished product
  • Competitive factory-direct pricing with no middlemen
  • Responsive customer service and technical support
  • Flexible MOQ to accommodate both trial orders and bulk shipments
Contact Us
Email: rainting@ybfasteners.com
Product Images
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
Packaging Options
Bolts are packed in neutral packaging boxes with standard quantities arranged in small cartons. Custom packaging configurations are available upon request. Small cartons are consolidated into larger master cartons for secure transportation. Palletized units are wrapped with waterproof film and reinforced with packaging straps, with custom shipping marks available.
Packaging Images
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
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GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C

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Product Detail
Place Of Origin :
ZHEJIANG CHINA
Supply Ability :
500 Tons/month
Standard :
DIN, ANSI, GB, JIS, BSW, GOST
MOQ :
50000
Sample :
Free Samples
Usage :
For Fastening Metal To Metal
Contact Supplier
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GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C
GB5287 Flat Washer Extra Large – 100HV Hardness, Product Grade C

NINGBO YONGBIAO FASTENER CO.,LTD

Verified Supplier
2 Years
zhejiang, ningbo
Since 2012
Business Type :
Manufacturer, Exporter, Trading Company
Main Products :
Pan Head Screw, Bugle Head Screw, Self Tapping Screw
Total Annual :
5000000-6000000
Employee Number :
45~53
Certification Level :
Verified Supplier
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