Carbon Steel Hex Head Combined Bolt with Flat Washer & Spring Washer
Carbon steel hex head combined bolt with flat washer and spring washer is a pre-assembled fastening solution designed to improve installation efficiency, prevent part loss, and enhance vibration resistance in industrial assembly systems. The carbon steel hex head combined bolt with flat washer and spring washer integrates a hex bolt, flat washer, and spring washer into one unit, ensuring consistent assembly quality and faster production speed.
This carbon steel hex head combined bolt with flat washer and spring washer is widely used in machinery equipment, electrical enclosures, automotive assemblies, construction systems, and OEM production lines where reliable fastening and high assembly efficiency are required.
Product Overview
The carbon steel hex head combined bolt with flat washer and spring washer is engineered to simplify installation processes by combining multiple components into a single fastener unit. This structure reduces assembly time, prevents missing parts, and ensures stable locking performance.
This carbon steel hex head combined bolt with flat washer and spring washer is especially suitable for automated production environments and high-volume manufacturing systems. The spring washer provides anti-loosening performance, while the flat washer distributes load evenly to protect the contact surface.
As a widely used industrial fastener, it plays an important role in improving assembly efficiency and structural reliability.
Product Specifications
| Item | Description |
|---|---|
| Product Name | Carbon Steel Hex Head Combined Bolt with Flat Washer & Spring Washer |
| Material | Carbon Steel |
| Structure | Hex Bolt + Flat Washer + Spring Washer |
| Head Type | External Hex |
| Thread Type | Metric Coarse Thread |
| Size Range | M4–M16 |
| Length Range | 10mm–100mm |
| Surface Finish | Zinc Plated / Black Zinc / Dacromet (optional) |
| Strength Grade | 4.8 / 8.8 / 10.9 |
| Corrosion Resistance | Moderate to High (depends on coating) |
| Thread Direction | Right Hand |
| Packaging | Bulk / tray / OEM packaging |
| Customization | Washer combination, coating, marking available |
Technical Parameters
| Parameter | Value |
|---|---|
| Tensile Strength | 400–1000 MPa (depending on grade) |
| Yield Strength | 320–900 MPa |
| Hardness | HV 200–320 |
| Density | 7.85 g/cm³ |
| Corrosion Resistance | Medium to high (zinc or Dacromet improves performance) |
| Operating Temperature | -50°C to 300°C |
| Thread Tolerance | 6g Standard |
| Manufacturing Standard | ISO / DIN equivalent |
Materials and Manufacturing Process
The carbon steel hex head combined bolt with flat washer and spring washer is manufactured through precision forming and assembly processes to ensure stability and consistency.
- Raw material selection: High-quality carbon steel wire rod
- Cold heading: Hex bolt forming process
- Thread rolling: Precision thread formation
- Heat treatment: Strength grade enhancement (8.8 / 10.9)
- Washer production: Flat washer and spring washer forming
- Automatic assembly: Washer pre-installation onto bolt
- Surface treatment: Zinc plating, black zinc, or Dacromet coating
- Inspection: Dimensional and assembly torque testing
- Packaging: Automated or bulk export packaging
Each carbon steel hex head combined bolt with flat washer and spring washer is produced under strict quality control for reliable industrial performance.
Applications of the Product
Combined bolts with washers are widely used in:
- Machinery equipment: Structural fastening systems
- Automotive industry: Chassis and assembly components
- Electrical cabinets: Control box installation systems
- Construction: Steel structures and support systems
- Home appliances: Internal structural assemblies
- Industrial automation: Production line equipment
- HVAC systems: Equipment mounting systems
- OEM manufacturing: High-volume assembly lines
Their integrated design improves efficiency and reduces assembly errors.
Why Choose This Product
- Pre-assembled structure improves installation efficiency
- Prevents loss of washers during assembly
- Spring washer improves anti-loosening performance
- Flat washer distributes load and protects surface
- Suitable for automated production lines
- Cost-effective industrial fastening solution
- Stable torque performance under vibration
- Multiple coating options available
- OEM customization support
The carbon steel hex head combined bolt with flat washer and spring washer ensures reliable and efficient fastening in industrial applications.
Why Choose Flybear
Flybear is a professional manufacturer specializing in industrial fastening systems and OEM combined fasteners.
- Advanced cold heading and automatic assembly lines
- Combined fastener production expertise
- OEM customization for industrial applications
- Strict quality inspection and testing systems
- Stable mass production capability
- Global export experience in fastener manufacturing
Flybear provides efficient fastening solutions for machinery, automotive, construction, and industrial manufacturing sectors.
Quality Inspection and Control
Strict quality control ensures consistent performance:
- Raw material chemical composition testing
- Tensile and hardness testing
- Thread gauge verification
- Washer assembly force testing
- Torque and anti-loosening performance testing
- Coating thickness inspection
- Dimensional accuracy inspection
- Packaging integrity verification
All production follows ISO quality management standards.
Selection Guide
When selecting combined bolts, consider:
- Strength grade (4.8 / 8.8 / 10.9)
- Corrosion environment level
- Washer combination type
- Load and torque requirements
- Size and thread length
- Automation assembly compatibility
Proper selection ensures stable and efficient performance.
FAQ
1. What is a combined bolt?
It is a pre-assembled bolt with washers to improve installation efficiency.
2. What is the function of the spring washer?
It prevents loosening caused by vibration.
3. What is the function of the flat washer?
It distributes load and protects the surface.
4. Can it be used in automation lines?
Yes, it is widely used in automated assembly systems.
5. Can custom combinations be made?
Yes, Flybear supports OEM customization.
We always adhere to the philosophy of quality first and customer first, providing customers with high-quality fastener products and one-stop fastener solutions.
Contact us for quotation, customization, and technical support via Contact Us.
