DIN6921 Carbon Steel Grade 8.8 Zinc Plated Hex Flange Bolt
The DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt is a high-strength structural fastening component designed for industrial assemblies requiring reliable preload, vibration resistance, and stable load distribution. As a core industrial fastener, the DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt integrates a hex head with an enlarged flange base, eliminating the need for a separate washer and improving assembly efficiency.
In modern engineering systems, the DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt is widely used in automotive, machinery, construction, and OEM equipment. Compared with standard hex head bolts or stainless steel fasteners, this flange bolt provides better surface load distribution and improved anti-loosening performance under dynamic conditions.
Product Overview
The DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt is manufactured according to DIN6921 standards, ensuring consistent geometry, precise threading, and reliable mechanical strength. Made from medium carbon steel and heat-treated to grade 8.8, it offers excellent tensile strength and durability for medium to heavy-duty applications.
The zinc plated surface provides effective corrosion resistance in general industrial environments, making the DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt suitable for indoor and outdoor applications.
As part of OEM fasteners and structural fastening systems, the DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt ensures stable joint performance and long-term reliability.
Product Specifications
| Item | Specification |
|---|---|
| Standard | din6921 |
| Product Name | din6921 carbon steel grade 8.8 zinc plated hex flange bolt |
| Material | carbon steel |
| Strength Grade | 8.8 |
| Thread Type | metric coarse thread |
| Head Type | hex flange head |
| Drive Type | external hex |
| Diameter Range | m5 – m20 |
| Length Range | 10 mm – 120 mm |
| Surface Finish | zinc plated |
| Thread Direction | right hand |
| Packaging | box / bulk / oem packaging |
| Customization | available |
Technical Parameters
| Parameter | Value |
|---|---|
| Tensile Strength | ≥ 800 mpa |
| Yield Strength | ≥ 640 mpa |
| Hardness | 22–32 hrc |
| Density | 7.85 g/cm³ |
| Corrosion Resistance | good (zinc coating protection) |
| Operating Temperature | -50°c to 150°c |
| Thread Tolerance | iso metric class 6g |
| Manufacturing Standard | din6921 / iso equivalent |
Materials and Manufacturing Process
The DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt is produced through a controlled industrial process to ensure consistent quality and mechanical performance.
- raw material selection: medium carbon steel wire rod
- cold heading: forming hex flange head structure
- thread rolling: high-precision metric threading
- heat treatment: quenching and tempering to grade 8.8
- surface preparation: cleaning and activation
- zinc plating: corrosion-resistant coating
- passivation: improves coating durability
- inspection: dimensional and mechanical testing
- packaging: export-grade protective packaging
This ensures stable performance for industrial fasteners used in structural and mechanical systems.
Applications of the Product
The DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt is widely used across multiple industries:
- automotive industry: chassis and engine assemblies
- machinery manufacturing: equipment structural fastening
- construction engineering: steel structure connections
- industrial equipment: mechanical assemblies
- agricultural machinery: vibration-prone systems
- renewable energy: support and mounting structures
- OEM production: mass assembly systems
- electrical equipment: enclosure and bracket fastening
Its flange design makes it more efficient than standard DIN933 bolt systems in load distribution applications.
Why Choose This Product
- high-strength grade 8.8 carbon steel material
- integrated flange design reduces need for washers
- excellent load distribution performance
- stable mechanical strength under vibration
- zinc plating for corrosion protection
- suitable for OEM bulk production
- reliable performance in industrial environments
- cost-effective structural fastening solution
- compatible with standard metric systems
Why Choose Flybear
Flybear is a professional manufacturer specializing in industrial fastening solutions.
- advanced cold heading and heat treatment production lines
- strict ISO-based quality control system
- strong OEM customization capability
- stable mass production and supply capability
- global export experience
- engineering technical support
Flybear provides reliable industrial fasteners and complete fastening solutions for global industries.
Quality Inspection and Control
Each DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt undergoes strict inspection:
- chemical composition analysis
- tensile strength testing
- hardness testing
- torque performance testing
- coating thickness measurement
- corrosion resistance testing
- thread gauge inspection
- dimensional accuracy measurement
- packaging quality inspection
All processes comply with ISO quality management standards.
Selection Guide
When selecting a DIN6921 carbon steel grade 8.8 zinc plated hex flange bolt, consider:
- required load and torque
- environmental corrosion level
- bolt diameter and length
- vibration conditions
- strength grade requirement (8.8)
- assembly structure design
Proper selection ensures safe and stable fastening performance.
FAQ
1. What is DIN6921 flange bolt?
It is a hex bolt with an integrated flange that improves load distribution.
2. What is grade 8.8?
It is a medium-high strength carbon steel bolt grade.
3. Why use flange bolts instead of standard hex bolts?
They eliminate the need for washers and improve surface load distribution.
4. Is zinc plating corrosion resistant?
Yes, it provides protection for general industrial environments.
5. Can custom sizes be produced?
Yes, Flybear supports OEM customization based on requirements.
We always adhere to the philosophy of quality first and customer first, providing customers with high-quality fastener products and one-stop fastener solutions.
For quotation, customization, and technical support, please Contact Us.
