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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.
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
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
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter,Trading Company
Year Established:
2012
Total Annual:
5000000-6000000
Employee Number:
45~53
Ecer Certification：
Verified Supplier
Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in Ningbo, the second largest port city in China. The factory is 50 kilometers away from Ningbo Port and can reach the sea freight warehouse in one hour, with very fast logistics. The company was founded in 2012 and after years of hard work... Ningbo Yongbiao Fastener Manufacturing Co., Ltd. is located in Ningbo, the second largest port city in China. The factory is 50 kilometers away from Ningbo Port and can reach the sea freight warehouse in one hour, with very fast logistics. The company was founded in 2012 and after years of hard work...
