YS STEEL Factory is a professional manufacturer and supplier of Bolt and Nut. Our standard specifications have regular inventory, and we support individual component purchases or pre-matched complete sets for export according to projects. We provide one-stop fastening component solutions for global engineering general contractors and integrators.
The entire set of fasteners includes hexagonal bolts, matching nuts, flat washers and spring washers. The raw materials are selected from high-quality carbon steel and are formed through cold heading technology. The metal structure is dense and there are no internal crack defects.
The products cover multiple thread specifications from M6 to M20, with bolt lengths ranging from 16 to 150mm. Customization is available upon request. The entire set of components undergoes overall hot-dip galvanizing treatment, with a zinc layer thickness of ≥ 85μm. The threads, edges and corner gaps can all form a continuous protective layer.
It is divided into multiple strength grades:
4.8 grade is suitable for light-load assembly scenarios
8.8 grade is commonly used in photovoltaic and steel structures
10.9 grade is used for high-load key load-bearing nodes.
The threads are processed by rolling thread technology. Tolerance is reserved before galvanizing, and the matching nuts adopt expanded thread design to improve the smoothness of assembly and reduce the problem of assembly sticking. The products undergo comprehensive testing for tensile strength, shear strength, coating and size before leaving the factory, and the quality can be traced. Bolts, nuts and various washers can be purchased separately, or a complete set can be packaged according to project requirements, using suitable export packaging for shipping.
- Ground photovoltaic power stations, rooftop distributed photovoltaic systems, agricultural photovoltaic complementation and fishery photovoltaic complementation projects, for the fastening of photovoltaic support nodes
- Steel structure workshops, steel frame connection nodes, main structure assembly that withstands alternating loads of wind and snow
- Multi-span greenhouse frame connection, suitable for humid, saline-alkali, and coastal salt fog environments
- Outdoor open-air mechanical equipment, connection points for equipment with long-term reciprocating vibration
- Supporting supplies for overseas EPC projects, complete sets of fasteners packaged for export delivery
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 / M14 / M16 / M20 |
| Bolt Length | 16‑150mm（Custom length available） |
| Surface Treatment | Hot‑dip Galvanized （≥85μm） |
| Kit Composition | Bolt, nut, flat washer, spring washer |
| Application Condition | PV station, steel workshop, greenhouse, outdoor machinery |
| Optional Service | Non‑standard customization, full‑set kits, export packing, OEM service |
When selecting bolts and nuts, Bolt and Nut will consider the load requirements specified in the project drawings to determine the strength grade. For light-load greenhouses, grade 4.8 is chosen; for conventional photovoltaic supports, grade 8.8 is preferred; and for critical nodes with high wind and snow loads, grade 10.9 is used.
Assembly sequence recommendation: Pass the bolt through the component, then place the flat washer and spring washer in sequence, and finally tighten the nut; the flat washer is responsible for distributing the pressure and protecting the workpiece, while the spring washer provides continuous preload to resist vibration loosening.
During the installation process, follow the specified torque in the drawings for locking, and avoid violent forceful tightening to prevent damage to the threads or failure of the washer to flatten.
When transporting and constructing, avoid hard objects from knocking and scratching the galvanized layer. The damaged area of the coating is prone to rusting. During the project operation phase, after the strong wind season, torque rechecks can be conducted for key nodes.
A1: Yes, we can adjust the number of bolts, nuts, and washers based on the project drawings. We also support purchasing individual accessories separately.
A2: The zinc layer reserved for the threads has a tolerance, and the nuts are expanded and machined. Under normal standard torque, the probability of seizing can be effectively reduced.
A3: It is not recommended. The same strength grade of bolts and nuts must be used for the same connection node, following the engineering design drawings.
A4: Standard products are delivered within 3-6 working days. Non-standard and customized products have a production cycle of 7-14 working days.
A5: Quality inspection materials for each batch of products can be provided to meet the requirements of overseas project approval.
A6: Standard specification samples are free of charge, and the shipping cost is borne by the customer. Non-standard customized samples will incur a small processing fee.
A7: Yes, export packaging labels and labels can be customized according to customer requirements.
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Unit1, 128Building, Nanhuxiangjun, Lunan District, Tangshan City, Hebei Province, China
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