GB21 Small Hexagon Head Bolt Grade 8.8 10.9 for Machinery Equipment
Price:
Negontiation
MOQ:
50000
Delivery Time:
7-25Days
Brand:
YONGBIAO
Product Description
GB21 Small Hexagon Head Bolts
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, making them ideal for tight spaces where standard bolts cannot fit.
Key Features
- Compact Head Profile: Reduced hex head width allows installation in confined spaces without compromising clamping force
- High Tensile Strength: Available up to Grade 12.9 with nominal tensile strength reaching 1,000 MPa after heat treatment
- 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 and harsh environments
- Precision Manufacturing: Cold forging and CNC machining ensure dimensional accuracy and consistent thread quality per GB 21-1976 standards
- 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
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
Contact Us
Email: rainting@ybfasteners.com
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
NINGBO YONGBIAO FASTENER CO.,LTD
Location
No.1 Lufeng Industrial Park, Wuxiang Town, Yinzhou District, Ningbo City, Zhejiang, China
Contact Person
Amylin