When manufacturing this Lock nut, YS STEEL factory uses high-quality carbon steel for forging and combines it with a graded heat treatment process to refine the internal structure of the metal and avoid quality defects such as internal cracks and deformation.
The entire series adopts a full-body hot-dip galvanizing process, covering the inner and outer walls of the thread, as well as the end face with a galvanized layer, eliminating the possibility of rusting in hard-to-reach areas.
It covers multiple strength grades (4.8/8.8/10.9) and all standard thread sizes, and can be precisely matched with bolts, flat washers, and spring washers of the same grade. It is a core component for long-term fastening and cost reduction in outdoor steel structure projects.
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 |
| Surface Treatment | Hot‑dip Galvanized |
| Standard | GB/T 6184 |
| Application Condition | PV power station, steel‑structure, greenhouse, outdoor vibration‑prone machinery |
| Optional Service | Non‑standard customization, full‑set kits, export packing, OEM service |
This Lock nut is specifically designed for long-term outdoor, high-frequency vibration, and high-corrosion conditions. It precisely fits specific scenarios and is suitable for various engineering projects that have high requirements for the stability and lifespan of fastening:
- Photovoltaic new energy projects
- Agricultural greenhouse steel structure projects
- Industrial steel structure buildings
- Outdoor mechanical equipment
- Overseas export projects
| Comparison Dimension | YS STEEL Hot-Dip Galvanized Lock Nut | Ordinary Standard Hex Nut |
| Anti-Loosening Mechanism | Built-in self-locking structure generates continuous thread friction under vibration | No locking feature; relies solely on tightening torque |
| Vibration Resistance | Sustains long-term wind vibration and cyclic alternating loads without rotational loosening | Prone to gradual loosening under repeated vibration |
| Strength Grades | Available in Grade 4.8 / 8.8 / 10.9, matched to corresponding bolt grades | Limited to lower grades; often mismatched with high-strength bolts |
| Corrosion Protection | Full-piece hot-dip galvanizing covers inner/outer threads and end faces | Thin electroplating or bare steel; rusts quickly in outdoor environments |
| Thread Precision | Tapping reserves zinc-coating tolerance; smooth engagement, reduced seizing risk | No coating tolerance reserved; frequent thread jamming after plating |
| Outdoor Service Life | Engineered for 25-year design life in PV and steel-structure systems | Typically 3–8 years before rust or thread failure |
| Re-Inspection Frequency | Low maintenance; periodic checks sufficient in most conditions | Requires frequent re-tightening, especially after strong wind seasons |
| Supply Flexibility | Standard sizes in stock; custom thread, grade and finish; full-kit export with bolts & washers | Standard-only inventory; limited customization, no kit packaging |
| Quality Traceability | Full-process QC from raw material to finished-product sampling; ISO 9001 certified | Batch-mixed sourcing; limited or no traceable inspection records |
| Typical Applications | Ground-mount PV, rooftop PV, agro-PV, steel-structure workshops, multi-span greenhouses | Indoor static joints, low-vibration general fastening only |
Standardized installation is the core to ensure the long-term performance of anti-loosening and anti-corrosion. Based on the factory's years of engineering support experience, the standardized installation process is as follows:
- Selecting the right installation conditions: Match the corresponding strength nut according to the project load, vibration frequency, and environmental grade. For inland normal conditions, 4.8/8.8 grades can be selected, while for heavy loads, high-frequency vibration, and coastal conditions, the 10.9-grade high-strength model is preferred.
- Pre-installation preparation: Before installation, clean the dust, zinc layer burrs, and rusted impurities on the bolt and thread surfaces to ensure smooth thread interlocking and avoid jamming or improper locking.
- Standardized disassembly and reuse: Key load-bearing nuts must not be repeatedly disassembled and reused; for non-static auxiliary nodes, after slight disassembly, check the integrity of the threads and coating, and only use them again if there is no damage.
- Timely replacement of aging components: If the Lock nut has a detached coating, rusted threads, reduced locking force, or slight deformation, replace it with a new one immediately to prevent potential safety hazards caused by continued use in poor condition.
- Storage and placement guidelines: Uninstalled finished products should be stored in a dry and ventilated warehouse to avoid outdoor stacking, rain exposure, and moisture. Do not allow premature oxidation and rusting before leaving the factory.
Address
Unit1, 128Building, Nanhuxiangjun, Lunan District, Tangshan City, Hebei Province, China
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