GB/T 5781-2025 Grade 4.8 Carbon Steel Hex Head Bolts Full Thread Hot Dip Galvanized Construction Fasteners
GB/T 5781-2025 Hexagon Head Bolts Grade 4.8 Carbon Steel (Product Grade C)
Product Description
| Attribute | Specification |
|---|---|
| Product Name | GB/T 5781-2025 Hexagon Head Bolt, Product Grade C |
| Standard | GB/T 5781-2025 (Equivalent to ISO 4018:2022 / DIN 558) |
| Material | Carbon Steel |
| Property Class | 4.8 |
| Thread | Full Thread, Metric Coarse |
| Size Range | M6 - M24 (Custom Sizes on Request) |
| Head Style | Hexagon Head |
| Surface Finish | Plain, Zinc Plated, Hot Dip Galvanized |
| Certification | ISO 9001 |
| Application | Construction, Steel Structures, General Machinery |
| Available Packing | Plastic bags + cartons + plywood pallets (strapped and film-wrapped) |
Key Features
1. Grade 4.8 property class - minimum tensile strength 400 MPa and yield strength 320 MPa, a dependable choice for general-purpose fixing.
2. Full thread - the thread runs the whole length of the shank, so the bolt can be cut to size on site without losing grip.
3. Standard dimensions - manufactured to GB/T 5781-2025, interchangeable with ISO 4018:2022 and DIN 558 bolts of the same size.
4. Finish options - plain, zinc plated or hot dip galvanized, so you can pick the right corrosion protection for the job.
5. Economy grade C - made for non-critical connections, helps keep project cost under control.
Typical Applications
- Steel structure assembly and building frames.
- General machinery and equipment fixing.
- Scaffolding and temporary structures.
- Fencing, racks and storage systems.
Our Services
1. Quick response to inquiries, usually within 24 hours.
2. Full specification and size lists available on request.
3. Samples can be arranged before mass production.
4. On-time delivery with complete export documentation.
5. Customized packing, with photos sent before shipment.
6. Fair pricing with consistent quality.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.