The YS STEEL factory also processes the threads of the China Hexagon socket bolt with a rolling process, ensuring regular thread profiles. The hot-dip galvanizing version can resist outdoor corrosion environments such as damp salt and alkali, as well as coastal salt spray; the blackening version is suitable for indoor mechanical assembly scenarios.
After installing the Hexagon socket bolt, regularly inspect the bolt head, internal hexagonal cavity and protective layer. If the coating is damaged, it should be promptly protected to prevent the base material from rusting.
Regularly recheck the locking torque. In high wind pressure areas, conduct key inspections after the end of the windy season to ensure the stability of the connection.
Storage should be kept dry and well-ventilated. Implement isolation and protection measures to prevent deformation and failure of the internal hexagonal holes due to collisions.
When disassembling and assembling, use matching standard hexagonal wrenches. Strictly prohibit violent operations. Deformed or cracked bolts are not allowed to be reused; they should be replaced directly.
Standard reference parameters, custom‑produced according to project drawing requirements
| Parameter | Technical Specification |
| Material | Carbon Steel |
| Strength Grade | 4.8 / 8.8 / 10.9（Customizable） |
| Thread Size | M6 / M8 / M10 / M12 / M16 |
| Bolt Length | 12‑120mm（Custom length available） |
| Surface Treatment | Hot‑dip Galvanized |
| Matching Parts | Nut, flat washer, spring washer |
| Application Condition | PV power station, steel‑structure, greenhouse, mechanical equipment |
| Optional Service | Non‑standard size, full‑set packing, export package, OEM service |
1. Raw material inspection: For carbon steel bars entering the warehouse, inspect the material composition and mechanical properties, and discard any non-compliant raw materials.
2. Cold heading forming: Cut the bars, and form the cylindrical head, outer ring rolling pattern, and hexagon hole in one step. The internal structure of the metal is dense.
3. Heat treatment and quenching: Execute the heat treatment process according to the target strength grade to enhance the tensile strength and fatigue resistance of the product.
4. Thread rolling processing: Precisely roll and form the threads, reserve the assembly gap for coating as needed, and avoid assembly thread jamming problems.
5. Surface treatment: Choose blackening or overall hot-dip galvanizing process to form a protective layer.
6. Full inspection of finished products: Complete size measurement, torque test, appearance screening, and coating inspection successively. Discard any non-compliant products.
7. Classification and packaging: Package the finished products separately, or combine them with matching gaskets and nuts to form a complete set and store them.
| Item | Knurled Hex Socket Cap Bolt | Ordinary Hex Socket Cap Bolt |
| Head Surface | Anti-slip knurled texture on cylinder head surface, increases friction during manual handling | Smooth cylinder head surface, easy sliding when manually picking |
| Surface Options | Support black oxide & hot-dip galvanized two surface treatments for indoor and outdoor scenarios | Mostly single surface finish, less optional |
| Assembly Characteristic | Cylindrical head for counterbore installation, fit compact inner connection points | Smooth head, no auxiliary friction texture |
| Corrosion Solution | Hot-dip galvanized version adapts coastal salt fog, black oxide for indoor machinery | Limited surface selection, not flexible for multi-environment projects |
| Applicable Scenarios | Indoor mechanical assembly, outdoor PV & steel structure dual usage | Mainly for general indoor equipment |
A1: The bolt can be purchased separately, or it can be packaged as a set with matching nuts and washers according to customer's requirements.
A2: No, the embossing is only on the outer wall of the cylindrical head. The reserved gap for the blind hole can be properly inserted and installed.
A3: It is not recommended to mix them. The same node requires a unified strength specification, and the selection should be based on the project drawings strictly.
A4: Standard inventory products are shipped within 3-6 working days; non-standard customized products have a production cycle of 7-14 working days.
A5: Quality inspection documents can be issued for each batch of products, meeting the requirements for overseas project acceptance.
A6: Standard specification samples are free of charge, and the shipping cost is borne by the customer; non-standard samples will incur a small processing fee.
A7: OEM customization is supported. The packaging labels and logos can be made according to customer's requirements.
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Unit1, 128Building, Nanhuxiangjun, Lunan District, Tangshan City, Hebei Province, China
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