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Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Specifications
Model Number :
GB21
Connection :
Common Bolt
Place Of Origin :
ZHEJIANG CHINA
Supply Ability :
500 Tons/month
Standard :
DIN, ANSI, GB, JIS, BSW, GOST
Brand Name :
YONGBIAO
Quality :
100% Inspection
Delivery Time :
7-25Days
Price :
Negontiation
Finish :
Zinc Plated
Measurement System :
INCH, Metric
MOQ :
50000
Sample :
Free Samples
Payment Terms :
T/T
Packaging Details :
Plastic Bag / Paper Box
Certification :
ISO 9001
Usage :
For Fastening Metal To Metal
Place of Origin :
China
Description
Custom GB21 Small Hexagon Head Bolt Stainless Steel
GB21 Small Hexagon Head Bolts (Small Hex Head Bolts per GB 21-1976) are Chinese national standard fasteners featuring a compact hexagonal head design with smaller across-flats dimensions compared to standard GB30 hex bolts.
Key Features
  • Compact Head Profile: Reduced hex head width enables installation in tight spaces where standard hex bolts cannot fit, without compromising clamping force.
  • High Tensile Strength: Available up to Grade 12.9 with nominal tensile strength reaching 1,000 MPa after heat treatment and quenching-tempering.
  • Versatile Material Grades: From Grade 4.8 for general-purpose fastening to Grade 10.9/12.9 for high-load structural connections.
  • Multiple Surface Finishes: Zinc plating for indoor corrosion protection; hot-dip galvanizing and Dacromet for outdoor, humid, or chemically aggressive environments.
  • Precision Manufacturing: Cold forging and CNC machining ensure dimensional accuracy and consistent thread quality, fully compliant with GB 21-1976 tolerances.
  • Full Traceability: Mill test certificates and third-party inspection reports (SGS, BV) available upon request.
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
Product Images
Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel
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
Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel Custom GB21 Small Hexagon Head Bolt Stainless Steel
Contact Us
Email: rainting@ybfasteners.com
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Custom GB21 Small Hexagon Head Bolt Stainless Steel

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Product Detail
Model Number :
GB21
Connection :
Common Bolt
Place Of Origin :
ZHEJIANG CHINA
Supply Ability :
500 Tons/month
Standard :
DIN, ANSI, GB, JIS, BSW, GOST
Brand Name :
YONGBIAO
Contact Supplier
video
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel
Custom GB21 Small Hexagon Head Bolt Stainless Steel

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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