Carbon Steel Zinc Plated Grade 8 Hexagon Head Bolt
Product Overview
Grade 8 Hexagon Head Bolt is a high-strength fastener designed for heavy-duty applications across various industries. These bolts are manufactured from medium carbon steel, quenched and tempered to achieve the required strength levels, and come with a corrosion-resistant zinc plating. Their hexagonal head design ensures superior torque handling, ease of tightening, and secure fastening performance. Engineered for optimal performance, Grade 8 Hex Head Bolts are ideal in applications requiring high tensile strength and durability.
At Flybear Fastener, we offer Grade 8 Hex Head Bolts that meet strict quality standards for performance and reliability. With our extensive expertise and fully integrated production process, we ensure our bolts function exceptionally even under demanding loads and harsh environments.
Product Specification Table
| Property | Detail |
|---|---|
| Product Name | Grade 8 Hexagon Head Bolt |
| Head Type | Hexagon |
| Thread Type | Full / Partial |
| Strength Grade | Grade 8 |
| Material | Carbon Steel |
| Finish | Zinc Plated |
| Sizes Available | 1/4″ – 2″ |
| Thread Pitch | Coarse / Fine Threads |
| Standard Compliance | ASME B18.2.1 |
Technical Parameters Table
| Mechanical Property | Specification |
|---|---|
| Tensile Strength | ≥ 150,000 psi (1040 MPa) |
| Yield Strength | ≥ 130,000 psi (895 MPa) |
| Hardness | 33-39 HRC |
| Elongation | ≥ 12% |
| Proof Load | As per ASME B18.2.1 |
| Surface Coating Thickness | 5-15 μm (Zinc Plating) |
Material Introduction & Manufacturing Process
Grade 8 Hexagon Head Bolts are manufactured primarily from high-quality medium carbon steel, ensuring high tensile strength. The production involves several key steps:
- Raw Material Inspection – Selected carbon steel is inspected for compliance and chemical composition.
- Cold or Hot Forging – Bolts are forged into shape, depending on sizes and specs.
- Thread Rolling – Precision thread rolling ensures smooth fit and alignment.
- Heat Treatment – Quenching and tempering create the high-grade mechanical properties typical of Grade 8 bolts.
- Surface Finishing – Zinc plating is applied for corrosion resistance.
Our surface treatments ensure long-term performance in corrosive environments such as industrial machinery, structural steel connections, and automotive assemblies.
Common Applications & Industries
Due to their exceptional strength, Grade 8 Hex Head Bolts are adopted widely across the following sectors:
- Automotive Industry – Engines, suspensions, chassis assemblies.
- Heavy Machinery – Mining equipment, construction machinery.
- Civil Engineering – Steel structures, bridges, road guard systems.
- Rail and Transportation – Locomotive and rolling stock joints.
- Oil & Gas – Rigging assemblies, pipelines, flanges.
- Agricultural Equipment – Tractors, tools, and implements.
These bolts are an integral component in environments where mechanical failure is not an option.
Key Product Strengths & Competitive Advantages
Core Keywords: Grade 8 Hexagon Head Bolt
Our Grade 8 Hex Head Bolts offer unmatched durability and high-precision performance. Here’s what sets them apart:
- Premium Carbon Steel: Manufactured from strictly selected carbon steel with traceability and certification.
- Precision Manufacturing: Accurate thread forms and minimal tolerance variations ensure assembly ease and load uniformity.
- Zinc Surface Coating: Provides robust rust and corrosion protection in outdoor and humid environments.
- Strong Customization Capabilities: We offer flexible customization in terms of length, head design, coating, and thread type.
- Adequate Inventory: Our large warehousing capabilities ensure fast dispatch and uninterrupted supply.
- Comprehensive Post-Sale Support: Our technical and sales team ensure timely responses and assistance.
Quality Inspection & Testing
Flybear Fastener is committed to quality excellence. All Grade 8 Hexagon Head Bolts undergo rigorous quality checks at every stage, including:
- Dimensional inspections using micrometers and thread gauges.
- Hardness testing.
- Tensile and yield strength verification.
- Salt spray testing for zinc coating.
- Batch traceability and full compliance reports.
Quality documentation can be provided upon request for third-party verification and project approvals.
Selection & Purchasing Guide
When selecting a Grade 8 Hex Head Bolt, consider the following:
- Match bolt grade with load requirements.
- Choose appropriate surface finish based on the corrosive environment.
- Confirm dimensions based on relevant engineering drawings or specifications.
- For structural or safety-critical applications, consult with a qualified engineer.
- Check threading type (UNC/UNF or metric) to match nuts and holes accurately.
Bulk discounts and OEM custom services are available for enterprise clients. For any customization needs, feel free to contact us.
Conclusion & Company Profile Promotion
At Flybear Fastener, we are proud to deliver high-performance Grade 8 Hexagon Head Bolts engineered to withstand your most challenging mechanical demands. Whether you are sourcing for mass production, infrastructure development, or a custom project, our team is ready to support your needs.
We always uphold the philosophy of “quality first, customer foremost,” and are committed to offering customers high-quality fastener products and one-stop solutions tailored to your industry. Explore our other product categories or contact us today to get expert recommendations and competitive quotations.
Additional Product Insights
Grade 8 Hexagon Head Bolt is often paired with matching Grade 8 washers and nuts to ensure a complete assembly. This optimized combination prevents stress concentrations and maintains joint integrity. If your application requires vibration resistance, also consider using locking mechanisms like spring or serrated washers.
We also offer ASTM A325, ISO 898-1 compliant bolts, and black-oxide finished versions on request, catering to specific client requirements across global markets.
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